[Event "Wch U14 blitz"]
[Site "Terme Catez"]
[Date "2024.12.16"]
[Round "16"]
[White "Boci, Mateo"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B47"]
[WhiteElo "2234"]
[BlackElo "2043"]
[PlyCount "71"]
[EventDate "2024.12.16"]
[EventType "swiss (blitz)"]
[EventRounds "22"]
[EventCountry "SLO"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. f4 a6 7. Nxc6 bxc6 8. Be3 d5 9. Bd3 Nf6 10. 0-0 Be7 11. Qf3 0-0 12. Rae1 Bb7 13. Qh3 c5 14. e5 Ne4 15. Bxe4 dxe4 16. Bc1 Rae8 17. Nxe4 f5 18. exf6 Bxf6 19. Nxf6+ Rxf6 20. f5 Qc6 21. fxe6 Rfxe6 22. Rxe6 Rxe6 23. Qg3 Re8 24. Bd2 h6 25. Bc3 Re7 26. h3 Kh7 27. Qd3+ Qg6 28. Qxg6+ Kxg6 29. Rf2 Be4 30. Kh2 Bd5 31. a3 Rd7 32. Rd2 Be6 33. Re2 Kf7 34. Bxg7 Bc4 35. Re5 Kxg7 36. Rxc5 1/2-1/2

[Event "Wch U14 blitz"]
[Site "Terme Catez"]
[Date "2024.12.16"]
[Round "15"]
[White "Derr, Oleg"]
[Black "Boci, Mateo"]
[Result "0-1"]
[ECO "B30"]
[WhiteElo "2043"]
[BlackElo "2234"]
[PlyCount "36"]
[EventDate "2024.12.16"]
[EventType "swiss (blitz)"]
[EventRounds "22"]
[EventCountry "SLO"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. 0-0 Nf6 5. Re1 d6 6. Bb3 Be7 7. c3 0-0 8. d4 cxd4 9. cxd4 b6 10. Nc3 Bd7 11. a3 Rc8 12. Qd3 e5 13. Be3 Ng4 14. Nd5 exd4 15. Nxe7+ Qxe7 16. Nxd4 Nxe3 17. Qxe3 Be6 18. h3 Nxd4 0-1

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.24"]
[Round "6"]
[White "Derr, Oleg"]
[Black "Rempe, Jonas"]
[Result "0-1"]
[ECO "B11"]
[WhiteElo "2019"]
[BlackElo "2182"]
[PlyCount "86"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 c6 2. Nc3 d5 3. Nf3 dxe4 4. Nxe4 Bf5 5. Qe2 e6 6. d4 Nf6 7. Nxf6+ Qxf6 8. Bg5 Qg6 9. 0-0-0 Bd6 10. h4 h6 11. h5 Qh7 12. Be3 Bg4 13. Qd2 Qf5 14. Nh4 Qf6 15. Be2 Bxe2 16. Qxe2 Nd7 17. Kb1 0-0-0 18. Nf3 Qf5 19. Nd2 Nf6 20. Rh4 Be7 21. g4 Qd5 22. Rhh1 Rhe8 23. f3 Qa5 24. c4 e5 25. Qf2 exd4 26. Bxd4 b6 27. Rhe1 Bb4 28. Rxe8 Nxe8 29. a3 Qa4 30. Qe2 Rxd4 31. axb4 Nd6 32. c5 Nc4 33. Nb3 Rxd1+ 34. Qxd1 Qxb4 35. cxb6 axb6 36. Qd3 Qxb3 37. Qxb3 Nd2+ 38. Kc2 Nxb3 39. Kxb3 Kd7 40. f4 Kd6 41. Kc4 c5 42. g5 Kc6 43. f5 f6 0-1

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.24"]
[Round "7"]
[White "Werner, Tom"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "A05"]
[WhiteElo "1872"]
[BlackElo "2019"]
[PlyCount "113"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. Nf3 Nf6 2. Rg1 d5 3. d4 g6 4. h3 Bg7 5. g4 c5 6. e3 h5 7. g5 Ne4 8. Nbd2 Nc6 9. c3 cxd4 10. exd4 Bf5 11. Nxe4 dxe4 12. Nh4 Qd7 13. Nxf5 gxf5 14. Bf4 0-0-0 15. Bb5 e5 16. dxe5 Qc7 17. Qa4 Nxe5 18. Bxe5 Qxe5 19. Rd1 e3 20. Bd7+ Kb8 21. f4 Qc5 22. Ke2 a6 23. Rd3 Qc7 24. Rgd1 Rhg8 25. Bxf5 Rxd3 26. Rxd3 Rd8 27. Rxe3 Qd6 28. Rd3 Qe7+ 29. Qe4 Qc7 30. Rxd8+ Qxd8 31. Qc4 Qc7 32. Qe4 Qe7 33. Kf3 Qd8 34. Qd3 Qb6 35. b3 Qg1 36. Qd2 Qh1+ 37. Kg3 f6 38. Kh4 fxg5+ 39. Kxh5 Qf3+ 40. Kxg5 Bxc3 41. Qd6+ Ka7 42. h4 Qg3+ 43. Bg4 Qe3 44. h5 a5 45. h6 Bb4 46. Qe5 Qd3 47. Qe6 Bd2 48. Qf7 Qd8+ 49. Kh5 Be1 50. Qe6 Bd2 51. Qe5 Qd3 52. Bf5 Qf3+ 53. Kg5 Qg3+ 54. Bg4 Be1 55. Qc5+ Kb8 56. Qc8+ Ka7 57. h7 1-0

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.23"]
[Round "5"]
[White "Klundt, Klaus"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B48"]
[WhiteElo "2252"]
[BlackElo "2019"]
[PlyCount "54"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be3 a6 7. Qf3 Nf6 8. 0-0-0 h5 9. Nxc6 dxc6 10. h3 b5 11. e5 Nd5 12. Nxd5 exd5 13. Bd3 Be6 14. Rhe1 Be7 15. Qg3 0-0-0 16. Bg5 h4 17. Qf4 c5 18. Bxe7 Qxe7 19. Qd2 Qc7 20. f4 d4 21. Kb1 c4 22. Be4 c3 23. Qc1 Qa5 24. b3 g6 25. Rf1 Rhg8 26. Rf3 Bf5 27. Re1 Qb4 1/2-1/2

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.23"]
[Round "4"]
[White "Wolf, Ulrich Martin"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "D03"]
[WhiteElo "2228"]
[BlackElo "2019"]
[PlyCount "26"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. Bg5 Bg7 4. Nbd2 d5 5. c3 0-0 6. e3 Nbd7 7. Bd3 Re8 8. 0-0 e5 9. dxe5 Nxe5 10. Nxe5 Rxe5 11. Bf4 Re8 12. h3 c5 13. Bb5 Bd7 1/2-1/2

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.22"]
[Round "3"]
[White "Derr, Oleg"]
[Black "Aravindan, Midhulan"]
[Result "1-0"]
[ECO "C14"]
[WhiteElo "2019"]
[BlackElo "1870"]
[PlyCount "87"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 a6 8. Qg4 Qf8 9. Nf3 c5 10. dxc5 Nxc5 11. Nxd5 Kd8 12. Qh4+ Kd7 13. Nb6+ Kc6 14. Nxa8 b6 15. 0-0-0 Kb7 16. Nxb6 Kxb6 17. Qf2 Kc7 18. Rd4 Nc6 19. Rc4 Nd7 20. Nd4 Ndb8 21. Be2 Bb7 22. Bf3 Qc8 23. Nxc6 Nxc6 24. Rd1 Rd8 25. Rxd8 Kxd8 26. Bxc6 Bxc6 27. Qd2+ Kc7 28. Rxc6+ Kxc6 29. Qc3+ Kb7 30. Qxc8+ Kxc8 31. b4 Kc7 32. c4 Kc6 33. Kd2 f6 34. Kd3 f5 35. h4 h5 36. Kd4 Kb6 37. a4 Kc6 38. b5+ axb5 39. cxb5+ Kb6 40. Kc4 Ka5 41. Kc5 Kxa4 42. b6 Kb3 43. b7 Kc3 44. b8Q 1-0

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.22"]
[Round "2"]
[White "Engel, Bruno"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "D00"]
[WhiteElo "2242"]
[BlackElo "2019"]
[PlyCount "59"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. d4 Nf6 2. Bg5 d5 3. e3 c5 4. Bxf6 gxf6 5. dxc5 Qa5+ 6. Nc3 e6 7. Qd4 Qd8 8. e4 Nc6 9. Bb5 Bd7 10. Bxc6 bxc6 11. Nf3 Rg8 12. exd5 cxd5 13. 0-0 Be7 14. b4 e5 15. Qxd5 Bh3 16. Qc6+ Kf8 17. Nh4 Rc8 18. Qf3 Bg4 19. Qe4 Qd2 20. Qe3 Qxc2 21. Nd5 Be6 22. Qh6+ Ke8 23. Nxf6+ Bxf6 24. Qxf6 Qe4 25. Rae1 Qxb4 26. Rxe5 Rxc5 27. Rd1 Rd5 28. Rxe6+ fxe6 29. Qxe6+ Kf8 30. Qxd5 1-0

[Event "Heusenstamm Sparkassen op 11th"]
[Site "Heusenstamm"]
[Date "2024.11.21"]
[Round "1"]
[White "Derr, Oleg"]
[Black "Gaertner, Johannes"]
[Result "1-0"]
[ECO "C15"]
[WhiteElo "2019"]
[BlackElo "1777"]
[PlyCount "51"]
[EventDate "2024.11.21"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB51_2024"]
[SourceDate "2024.12.18"]
[SourceVersion "1"]
[SourceVersionDate "2024.12.18"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. Nge2 Nf6 5. e5 Nfd7 6. a3 Be7 7. Be3 c5 8. f4 Nc6 9. dxc5 Nxc5 10. b4 Nd7 11. Nd4 Nb6 12. Bd3 0-0 13. 0-0 f6 14. Qh5 f5 15. Nce2 Bd7 16. Nxc6 bxc6 17. Qf3 Rc8 18. Qf2 Kh8 19. Nd4 c5 20. bxc5 Bxc5 21. Nxf5 Bxe3 22. Nxe3 Qc7 23. Qh4 h6 24. Ng4 Qd8 25. Qh3 Qe7 26. Rf3 1-0

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.27"]
[Round "7"]
[White "Derr, Oleg"]
[Black "Hallen, Maxime"]
[Result "1-0"]
[ECO "B11"]
[WhiteElo "2033"]
[BlackElo "1748"]
[PlyCount "81"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. e4 c6 2. Nc3 d5 3. Nf3 Bg4 4. h3 Bxf3 5. Qxf3 e6 6. d4 Nf6 7. Be2 dxe4 8. Qe3 Bd6 9. Nxe4 Nxe4 10. Qxe4 Nd7 11. 0-0 Nf6 12. Qf3 0-0 13. Rd1 Bc7 14. g3 Qd5 15. Qd3 h6 16. Bf1 Rfd8 17. Be3 Qd7 18. c4 Bb6 19. Qb3 Rab8 20. Bg2 Qe7 21. a4 c5 22. a5 Bc7 23. dxc5 Rxd1+ 24. Qxd1 Be5 25. Rb1 Rd8 26. Qf3 Qc7 27. b4 Rd7 28. c6 bxc6 29. Qxc6 Qxc6 30. Bxc6 Rc7 31. b5 Bc3 32. a6 Nd7 33. Rd1 Ne5 34. Bf4 g5 35. Bxe5 Bxe5 36. c5 Kf8 37. Kg2 Ke7 38. Kf3 Bc3 39. Rc1 Bb4 40. b6 Rxc6 41. b7 1-0

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.27"]
[Round "6"]
[White "Sreeramulu, Aarush"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "D85"]
[WhiteElo "1923"]
[BlackElo "2033"]
[PlyCount "73"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Bg5 c5 8. Rc1 0-0 9. d5 h6 10. Be3 Nd7 11. Nf3 Nf6 12. Bd3 c4 13. Bb1 b5 14. Qd2 Ng4 15. Bd4 e5 16. dxe6 Bxe6 17. h3 Nf6 18. 0-0 Kh7 19. Rfd1 Qc7 20. Be5 Qb7 21. Qc2 Rfe8 22. Rd6 Bf8 23. Rd4 Nd7 24. Bd6 Bxd6 25. Rxd6 Nc5 26. Qd2 Qc7 27. e5 Rad8 28. Rd1 Nb7 29. Rd4 Rxd4 30. Nxd4 Qxe5 31. f4 Qc5 32. Kh1 Nd6 33. Re1 Qd5 34. Re5 Qa8 35. Nxe6 fxe6 36. Qxd6 Rd8 37. Qe7+ 1-0

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.26"]
[Round "5"]
[White "Derr, Oleg"]
[Black "Dorst, Johannes"]
[Result "0-1"]
[ECO "B33"]
[WhiteElo "2033"]
[BlackElo "2191"]
[PlyCount "116"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Nd5 Nxd5 8. exd5 Ne7 9. a4 Nf5 10. Bd3 Be7 11. Bxf5 Bxf5 12. 0-0 a6 13. Nc3 0-0 14. Be3 Rc8 15. a5 Bg6 16. Qd2 Rc4 17. Ra4 Qc7 18. Rc1 Rc8 19. Bb6 Qd7 20. Rxc4 Rxc4 21. b3 Rc8 22. Na4 Qg4 23. f3 Bg5 24. Be3 Bxe3+ 25. Qxe3 Qb4 26. Qb6 Qxb6+ 27. Nxb6 Rxc2 28. Rxc2 Bxc2 29. b4 Bb3 30. Kf2 Kf8 31. Ke3 Ke7 32. Kd3 f5 33. Kc3 Ba2 34. Kb2 e4 35. fxe4 fxe4 36. Kc3 Kf6 37. Kd4 e3 38. Kxe3 Ke5 39. g3 Bxd5 40. Nd7+ Kf5 41. Nb6 Be6 42. Na4 Ke5 43. Nc3 Bc4 44. Ne4 h6 45. Nd2 Bb5 46. Nf3+ Kd5 47. Nd2 Bd7 48. Kd3 Bf5+ 49. Kc3 g6 50. Nc4 h5 51. Nd2 Be4 52. Nc4 Bf3 53. Nd2 Be2 54. h4 Bb5 55. Nf3 Ke4 56. Ne1 Ke3 57. Ng2+ Kf3 58. Nf4 Be8 0-1

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.26"]
[Round "4"]
[White "Koch, Mika Jonas"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "D79"]
[WhiteElo "1644"]
[BlackElo "2033"]
[PlyCount "46"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nf3 Bg7 4. g3 0-0 5. Bg2 c6 6. 0-0 d5 7. cxd5 cxd5 8. Nc3 Nc6 9. Bf4 Ne4 10. Rc1 Qa5 11. a3 Bf5 12. e3 f6 13. h4 Nxc3 14. Rxc3 e5 15. dxe5 fxe5 16. Bg5 h6 17. Qb3 hxg5 18. Qxb7 e4 19. Rxc6 exf3 20. Bxf3 Rab8 21. Qe7 Rbe8 22. Qxg5 Re5 23. Rd1 Be4 0-1

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.25"]
[Round "3"]
[White "Derr, Oleg"]
[Black "Himmelspacht, Maxim"]
[Result "1-0"]
[ECO "C13"]
[WhiteElo "2033"]
[BlackElo "1827"]
[PlyCount "59"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Nxf6+ Bxf6 7. Bxf6 Qxf6 8. Nf3 0-0 9. Qe2 b6 10. Qe4 c6 11. 0-0-0 Qf5 12. Qh4 Ba6 13. c4 Qf6 14. Qg3 Rd8 15. Bd3 c5 16. Be4 Nc6 17. Bxc6 Rac8 18. Be4 cxd4 19. Kb1 Bxc4 20. Rd2 Qe7 21. Rxd4 f5 22. Rxd8+ Qxd8 23. Bc2 Bxa2+ 24. Kxa2 Rxc2 25. Qe5 Qd7 26. Ng5 h6 27. Nxe6 Rxf2 28. Rc1 g5 29. Rc8+ Qxc8 30. Qg7# 1-0

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.25"]
[Round "2"]
[White "Korneev, Oleg"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "D94"]
[WhiteElo "2454"]
[BlackElo "2033"]
[PlyCount "213"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c6 3. Nc3 d5 4. e3 g6 5. d4 Bg7 6. Be2 0-0 7. 0-0 Ne4 8. Qb3 Nxc3 9. bxc3 dxc4 10. Bxc4 Nd7 11. a4 Nb6 12. Be2 Be6 13. c4 c5 14. a5 cxd4 15. Nxd4 Nd7 16. Ba3 Qc7 17. Nxe6 fxe6 18. Rab1 Rab8 19. Bg4 Nc5 20. Bxc5 Qxc5 21. Qb5 Qa3 22. c5 Bc3 23. Qc4 Bf6 24. Bf3 Rfc8 25. Rfc1 Qxa5 26. Bxb7 Rc7 27. Qxe6+ Kg7 28. c6 Qa3 29. Rd1 Qa4 30. g3 a5 31. h4 Qc2 32. Rbc1 Qb2 33. Rb1 Qc2 34. e4 Rf8 35. Rbc1 Qb2 36. Rb1 Qc2 37. Qb3 Qxe4 38. Qd5 Qc2 39. Rbc1 Qb2 40. Rb1 Qc3 41. Ra1 Qc2 42. Ra2 Bb2 43. Rf1 Qc3 44. Qxa5 Qxa5 45. Rxa5 Bd4 46. Kg2 e5 47. Rd5 Bc3 48. Rfd1 Rff7 49. R1d3 Bd4 50. f4 Rfe7 51. Rd8 Bb6 52. fxe5 Rxe5 53. R8d7+ Re7 54. Bc8 Kf8 55. Rxe7 Kxe7 56. Bd7 Ra7 57. Rb3 Bc7 58. Re3+ Kf7 59. g4 Ra2+ 60. Kf1 Ra4 61. Ke2 Rb4 62. Ra3 Ke7 63. Re3+ Kf7 64. Ra3 Ke7 65. Ra7 Kd6 66. Kf3 Bb8 67. Ra3 Bc7 68. Re3 Bd8 69. Re6+ Kc7 70. h5 gxh5 71. gxh5 Bg5 72. Re8 h6 73. Rc8+ Kd6 74. Ke2 Rh4 75. Be8 Rc4 76. Kd3 Rc1 77. Ra8 Rd1+ 78. Ke4 Rc1 79. Kf5 Rf1+ 80. Kg6 Rc1 81. Ra7 Ke6 82. Ra4 Kd6 83. Rd4+ Kc7 84. Rd5 Bf4 85. Rd7+ Kc8 86. Ra7 Be3 87. Bd7+ Kd8 88. Rb7 Bg5 89. Kf5 Rf1+ 90. Ke6 Re1+ 91. Kf7 Rf1+ 92. Kg7 Rc1 93. Kg8 Rc2 94. Rb8+ Kc7 95. Rc8+ Kd6 96. Re8 Rc1 97. Re6+ Kc7 98. Be8 Rc3 99. Rg6 Re3 100. Bf7 Re5 101. Bb3 Re8+ 102. Kf7 Re7+ 103. Kf8 Re3 104. Bd5 Rc3 105. Rxg5 hxg5 106. h6 Rd3 107. Bg2 1-0

[Event "Marburg op"]
[Site "Marburg"]
[Date "2024.10.24"]
[Round "1"]
[White "Derr, Oleg"]
[Black "Hassler, Rolf"]
[Result "1-0"]
[ECO "C10"]
[WhiteElo "2033"]
[BlackElo "1761"]
[PlyCount "69"]
[EventDate "2024.10.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CB16_2025"]
[SourceDate "2025.04.16"]
[SourceVersion "1"]
[SourceVersionDate "2025.04.16"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Be7 4. e5 b6 5. Qg4 g6 6. h4 h5 7. Qg3 Ba6 8. Bxa6 Nxa6 9. a3 Nh6 10. Bxh6 Rxh6 11. Qd3 Nb8 12. Nf3 Nc6 13. Ne2 Qd7 14. Rc1 Na5 15. Nd2 0-0-0 16. c4 dxc4 17. Nxc4 Nc6 18. Qf3 Qd5 19. Qxd5 exd5 20. Nxb6+ Kb7 21. Na4 Na5 22. Nc5+ Kb6 23. Rh3 Nc4 24. Rb3+ Kc6 25. Nb7 Rf8 26. Na5+ Kd7 27. Nxc4 dxc4 28. Rxc4 Bxh4 29. Rb7 Bd8 30. d5 Kc8 31. Rxa7 Kb8 32. Ra5 g5 33. d6 c6 34. Rb4+ Kc8 35. Ra7 1-0

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.25"]
[Round "9"]
[White "Goldkuhle, Collin"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B21"]
[WhiteElo "1908"]
[BlackElo "1946"]
[PlyCount "36"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. f4 d5 4. Nf3 dxe4 5. Nxe4 Nf6 6. Nc3 Nc6 7. Bb5 Bd7 8. a4 a6 9. Bc4 Bd6 10. d4 cxd4 11. Nxd4 0-0 12. Nb3 Qc7 13. 0-0 e5 14. fxe5 Nxe5 15. Be2 Neg4 16. h3 Bc5+ 17. Rf2 Qh2+ 18. Kf1 Qh1# 0-1

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.24"]
[Round "8"]
[White "Derr, Oleg"]
[Black "Sickmann, Lisa"]
[Result "1/2-1/2"]
[ECO "D31"]
[WhiteElo "1946"]
[BlackElo "1980"]
[PlyCount "41"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. cxd5 exd5 5. Bf4 c6 6. e3 Bf5 7. Nge2 Nd7 8. h4 h5 9. Ng3 Bg6 10. Bd3 Bxd3 11. Qxd3 Ngf6 12. Nf5 0-0 13. Nxe7+ Qxe7 14. 0-0-0 b5 15. Bg5 b4 16. Na4 Rfc8 17. Kb1 Rab8 18. f3 Qd8 19. Bf4 Rb5 20. Rc1 Qa5 21. b3 1/2-1/2

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.23"]
[Round "7"]
[White "Derr, Oleg"]
[Black "Albrecht, Neil"]
[Result "0-1"]
[ECO "C70"]
[WhiteElo "1946"]
[BlackElo "1937"]
[PlyCount "118"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 f5 5. d4 exd4 6. e5 b5 7. Bb3 Na5 8. Qxd4 Bb7 9. Bd5 c6 10. Bxg8 Rxg8 11. Bg5 Be7 12. Bxe7 Qxe7 13. b4 c5 14. bxc5 Bxf3 15. gxf3 Nc6 16. Qe3 Nxe5 17. Nd2 Rc8 18. f4 Ng4 19. Qxe7+ Kxe7 20. Nb3 Rge8 21. 0-0 Nf6 22. Rfe1+ Kf7 23. f3 Rxe1+ 24. Rxe1 g6 25. Ra1 Nh5 26. a4 Nxf4 27. axb5 axb5 28. Ra7 Ke7 29. Rb7 Ne6 30. Rxb5 Ra8 31. Rb7 Nd8 32. Rb4 Nc6 33. Rc4 Ne5 34. Rc3 Ra4 35. Kf2 Kf6 36. Nc1 g5 37. Nd3 Nc6 38. Rb3 h6 39. Rb7 Ke6 40. Rb6 Rc4 41. Rb2 Kd5 42. Kg3 h5 43. Rb7 Ke6 44. Rb2 f4+ 45. Kf2 Kf5 46. h3 Nd4 47. Rb7 Rxc2+ 48. Kf1 Rc3 49. Ne1 Nxf3 50. Nxf3 Rxf3+ 51. Kg2 Rd3 52. Rb6 g4 53. hxg4+ hxg4 54. Rh6 Rd2+ 55. Kg1 f3 56. Kf1 g3 57. Ke1 Re2+ 58. Kf1 g2+ 59. Kg1 Re1+ 0-1

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.22"]
[Round "6"]
[White "Li, Luxuan"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B50"]
[WhiteElo "1705"]
[BlackElo "1946"]
[PlyCount "56"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bc4 Nf6 4. d3 Nc6 5. c3 g6 6. 0-0 Bg7 7. Re1 0-0 8. Nbd2 Na5 9. e5 dxe5 10. Nxe5 Bf5 11. Nb3 Nxc4 12. dxc4 Qc7 13. Qe2 Rad8 14. Bf4 Nh5 15. Qe3 Nxf4 16. Qxf4 Rd6 17. Nf3 Rfd8 18. g4 Bc8 19. Ng5 e5 20. Qg3 b6 21. Ne4 Rd3 22. Qh4 Bb7 23. Nf6+ Bxf6 24. Qxf6 R3d6 25. Qh4 Qc6 26. f3 Qxf3 27. Qg3 Qc6 28. Rxe5 Rd3 0-1

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.22"]
[Round "5"]
[White "Vranckx, Oscar"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B45"]
[WhiteElo "1867"]
[BlackElo "1946"]
[PlyCount "52"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Bb7 9. c4 Nb4 10. Bd2 c5 11. Bxb4 cxb4 12. Bd3 Qa5 13. Qd2 Qxe5 14. 0-0-0 Be7 15. Rhe1 Qc7 16. Kb1 0-0 17. f4 f5 18. Ng3 Bc5 19. Bc2 Bc6 20. Re5 Qb6 21. Ne2 Rad8 22. g4 Rde8 23. gxf5 exf5 24. Rxe8 Rxe8 25. Bxf5 g6 26. Bd3 Qb7 1/2-1/2

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.21"]
[Round "4"]
[White "Derr, Oleg"]
[Black "Nguyen, Thanh An"]
[Result "1/2-1/2"]
[ECO "B50"]
[WhiteElo "1946"]
[BlackElo "1793"]
[PlyCount "90"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bc4 Nf6 4. d3 e6 5. 0-0 Nc6 6. Bb3 Bd7 7. c3 g6 8. Re1 Bg7 9. d4 0-0 10. Nbd2 cxd4 11. cxd4 d5 12. e5 Ne8 13. Nf1 f6 14. exf6 Qxf6 15. Bg5 Qf7 16. Qd2 Nd6 17. Ng3 Nf5 18. Nxf5 gxf5 19. Bf4 Bf6 20. Ne5 Bxe5 21. dxe5 Qg6 22. Re3 Kh8 23. Rg3 Qf7 24. Re1 Rg8 25. Bg5 Rg6 26. h4 h5 27. Ree3 Kh7 28. Qd1 Rg7 29. Bf6 Rxg3 30. Rxg3 Rg8 31. Rg5 Rxg5 32. hxg5 Be8 33. Bc2 Kg8 34. f3 h4 35. Qe1 Qh5 36. Bd1 Qh7 37. Qf2 b6 38. Kh2 Qc7 39. Qxh4 Qh7 40. Qxh7+ Kxh7 41. g4 fxg4 42. f4 Kg6 43. Bxg4 Nd4 44. Kg3 Bb5 45. Be7 Nf5+ 1/2-1/2

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.20"]
[Round "3"]
[White "Mohylnyi, Stepan"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "B45"]
[WhiteElo "2147"]
[BlackElo "1946"]
[PlyCount "83"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. a3 d5 7. exd5 exd5 8. Bb5 Bd7 9. 0-0 Be7 10. h3 0-0 11. Be3 a6 12. Be2 Rc8 13. Re1 Ne5 14. Nf3 Nxf3+ 15. Bxf3 Bf5 16. Bd4 Bc5 17. Bxf6 Qxf6 18. Qxd5 Bxc2 19. Re2 Qg6 20. Rc1 Bf5 21. Kh1 b6 22. Rd1 h6 23. Qd2 a5 24. Na4 Qf6 25. Qf4 g5 26. Qg3 Bd4 27. Be4 Bd7 28. Qd3 Be5 29. Nxb6 Qxb6 30. Bh7+ Kh8 31. Rxe5 Ba4 32. Qd4 Qf6 33. Rxa5 Qxd4 34. Rxd4 Kxh7 35. Raxa4 Rc2 36. b4 Rxf2 37. b5 Ra2 38. b6 Rc8 39. b7 Rc1+ 40. Kh2 Rcc2 41. Rg4 Rcb2 42. Rab4 1-0

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.19"]
[Round "2"]
[White "Derr, Oleg"]
[Black "Pimenov, Danil"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "1946"]
[BlackElo "1863"]
[PlyCount "95"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. Bc4 e6 4. 0-0 Qc7 5. Re1 d6 6. c3 Be7 7. d4 Nf6 8. Bb3 0-0 9. a4 Rd8 10. Nbd2 b6 11. Nf1 Bb7 12. Ng3 a6 13. Bd2 b5 14. Qe2 c4 15. Bc2 e5 16. d5 Nb8 17. Nf5 Bf8 18. Bg5 Nbd7 19. N3h4 Rdb8 20. Qf3 Kh8 21. Nh6 gxh6 22. Bxf6+ Nxf6 23. Qxf6+ Bg7 24. Qf3 Bc8 25. a5 Qe7 26. g3 Bf6 27. Ng2 Bg7 28. Qh5 Ra7 29. h4 Qd7 30. Ne3 Qe7 31. Bd1 Rc7 32. Bg4 Bxg4 33. Qxg4 b4 34. Rec1 bxc3 35. Rxc3 Rxb2 36. Rxc4 Rxc4 37. Nxc4 Rb8 38. Nb6 Qc7 39. Qe2 Qc3 40. Ra4 Qb3 41. Qxa6 f5 42. Rc4 Bf8 43. Rc8 Qb1+ 44. Kh2 Qe1 45. Rxb8 Qxf2+ 46. Kh3 fxe4 47. Rxf8+ Qxf8 48. Qc8 1-0

[Event "GER-ch U14"]
[Site "Willingen"]
[Date "2024.05.19"]
[Round "1"]
[White "Han, Erdem"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "E32"]
[WhiteElo "1654"]
[BlackElo "1946"]
[PlyCount "50"]
[EventDate "2024.05.19"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 220 Extra"]
[Source "ChessBase"]
[SourceDate "2024.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.07.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. Nf3 0-0 6. Bg5 h6 7. Bh4 g5 8. Bg3 Ne4 9. e3 b6 10. Bd3 Bb7 11. 0-0 Nxg3 12. hxg3 Nc6 13. Rfd1 Be7 14. a3 Rc8 15. Rac1 Na5 16. cxd5 exd5 17. Bf5 Ra8 18. Ne5 a6 19. Be6 fxe6 20. Qg6+ Kh8 21. Qxh6+ Kg8 22. Qxe6+ Kg7 23. Qg6+ Kh8 24. Qh6+ Kg8 25. Qg6+ Kh8 1/2-1/2

[Event "GER-ch Amateurs"]
[Site "Bad Wildungen"]
[Date "2024.??.??"]
[Round "2"]
[White "Derr, Oleg"]
[Black "Bongardt, Livius"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "1943"]
[BlackElo "1875"]
[PlyCount "141"]
[EventDate "2024.08.03"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "GER"]
[SourceTitle "CBM 221 Extra"]
[Source "ChessBase"]
[SourceDate "2024.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. 0-0 0-0 6. Nc3 d6 7. a4 Kh8 8. h3 Ng8 9. d4 Nxd4 10. Nxd4 exd4 11. Qxd4 f5 12. Nd5 fxe4 13. Qxe4 Bf5 14. Qe2 c6 15. Nxe7 Qxe7 16. Qxe7 Nxe7 17. Re1 Ng6 18. c3 Ne5 19. Be2 Bd3 20. f4 Bxe2 21. fxe5 Bc4 22. exd6 Rf6 23. d7 h6 24. Be3 Rd8 25. Rad1 Rf7 26. Bxa7 Rfxd7 27. Re8+ Rxe8 28. Rxd7 Re1+ 29. Kh2 Re2 30. Bd4 Rxb2 31. Rxg7 Ra2 32. a5 Bd5 33. Bf6 Rf2 34. Be5 Re2 35. Bd4 Ra2 36. Rxb7+ Kg8 37. Rg7+ Kf8 38. Rg3 h5 39. Bb6 Kf7 40. Rg5 Kf6 41. Bd8+ Ke6 42. Bb6 Kf6 43. h4 Ke6 44. c4 Bf3 45. a6 Rxa6 46. gxf3 Rxb6 47. Rxh5 Rb4 48. c5 Rb2+ 49. Kg3 Rb1 50. Kg4 Rg1+ 51. Kf4 Rh1 52. Kg3 Rg1+ 53. Kf2 Rc1 54. Rg5 Rc2+ 55. Kg3 Rc1 56. h5 Rg1+ 57. Kf4 Rh1 58. Re5+ Kf6 59. Rf5+ Ke6 60. Rg5 Rh4+ 61. Kg3 Rh1 62. Kg4 Rg1+ 63. Kf4 Rh1 64. Ke4 Re1+ 65. Kd4 Rd1+ 66. Kc4 Rc1+ 67. Kb4 Rh1 68. Rg6+ Kd5 69. Rd6+ Ke5 70. h6 Rb1+ 71. Ka5 1-0

[Event "GER-ch Amateurs"]
[Site "Bad Wildungen"]
[Date "2024.??.??"]
[Round "4"]
[White "Derr, Oleg"]
[Black "Lu, Yunong Elias"]
[Result "1/2-1/2"]
[ECO "C42"]
[WhiteElo "1943"]
[BlackElo "1976"]
[PlyCount "41"]
[EventDate "2024.08.03"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "GER"]
[SourceTitle "CBM 221 Extra"]
[Source "ChessBase"]
[SourceDate "2024.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.09.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Nxc3 6. dxc3 Be7 7. Be3 Be6 8. Be2 Nc6 9. Qd2 a6 10. a3 Qd7 11. Nd4 Ne5 12. Nxe6 Qxe6 13. h3 Nc4 14. Bxc4 Qxc4 15. Qd3 Qc6 16. 0-0 0-0 17. Rad1 Rae8 18. Rfe1 Bd8 19. Bd4 Re6 20. Re3 Rxe3 21. Bxe3 1/2-1/2

[Event "GER-ch Amateurs"]
[Site "Bad Wildungen"]
[Date "2024.??.??"]
[Round "1"]
[White "Petzold, Johannes Julius"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B45"]
[WhiteElo "1983"]
[BlackElo "1943"]
[PlyCount "66"]
[EventDate "2024.08.03"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "GER"]
[SourceTitle "CBM 221 Extra"]
[Source "ChessBase"]
[SourceDate "2024.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Ndb5 Bc5 7. Nd6+ Ke7 8. Nc4 d5 9. e5 Ne8 10. Nd2 Nxe5 11. Nb3 Bb6 12. Qh5 Ng6 13. Bd3 Nf6 14. Bg5 Kf8 15. Qe2 h6 16. Bd2 Bd7 17. 0-0-0 Ne7 18. g4 d4 19. Ne4 Nfd5 20. g5 h5 21. Bc4 Bc6 22. Rhe1 Rc8 23. Bxd5 Qxd5 24. Bb4 Bb5 25. Qf3 Qc4 26. Bxe7+ Kxe7 27. Rd2 a5 28. g6 f6 29. Nxf6 gxf6 30. Qxb7+ Qc7 31. Qd5 Qc6 32. Qf5 d3 33. g7 Rhg8 0-1

[Event "GER-ch Amateurs"]
[Site "Bad Wildungen"]
[Date "2024.??.??"]
[Round "5"]
[White "Pick, Max"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "1906"]
[BlackElo "1943"]
[PlyCount "86"]
[EventDate "2024.08.03"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "GER"]
[SourceTitle "CBM 221 Extra"]
[Source "ChessBase"]
[SourceDate "2024.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.09.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. Bf4 d5 4. e3 Bd6 5. Ne5 0-0 6. Bd3 c5 7. c3 Qc7 8. Nd2 Nc6 9. Ndf3 cxd4 10. exd4 Ng4 11. Bxh7+ Kxh7 12. Ng5+ Kg8 13. Qxg4 f6 14. Nxc6 Bxf4 15. Nxe6 Re8 16. Ncd8 Qe7 17. 0-0 Rxd8 18. Rae1 Re8 19. Qxf4 Bxe6 20. Re3 Qf7 21. Rfe1 Bd7 22. Qd6 Bc6 23. h3 Rad8 24. Qc5 a6 25. Re7 Rxe7 26. Qxe7 Re8 27. Qxf7+ Kxf7 28. Rxe8 Bxe8 29. f4 Ke6 30. Kf2 Bb5 31. g4 Bc4 32. b3 Bd3 33. h4 Bb1 34. a3 Bc2 35. f5+ Kd6 36. Ke3 Bxb3 37. Kd2 Ba4 38. Kc1 Be8 39. Kd2 Kc6 40. Ke3 Kb5 41. g5 Kc4 42. g6 Kxc3 43. h5 b5 0-1

[Event "GER-ch Amateurs"]
[Site "Bad Wildungen"]
[Date "2024.??.??"]
[Round "3"]
[White "Willand, Oliver"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B44"]
[WhiteElo "1868"]
[BlackElo "1943"]
[PlyCount "88"]
[EventDate "2024.08.03"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "GER"]
[SourceTitle "CBM 221 Extra"]
[Source "ChessBase"]
[SourceDate "2024.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2024.09.30"]
[SourceQuality "1"]

1. e4 c5 2. c4 Nc6 3. Ne2 e6 4. Nbc3 Nf6 5. d4 cxd4 6. Nxd4 Bc5 7. Nxc6 dxc6 8. Qxd8+ Kxd8 9. Be2 e5 10. 0-0 Be6 11. a3 Kc7 12. h3 h6 13. Kh2 Bd4 14. Bd2 Rad8 15. Rad1 Kc8 16. g4 g5 17. f3 Rd7 18. Kg2 Rhd8 19. b3 Ne8 20. Nb1 Nc7 21. Bc3 f6 22. Bxd4 Rxd4 23. Rxd4 Rxd4 24. Rd1 Bf7 25. Rxd4 exd4 26. Kf2 Ne6 27. Ke1 Nf4 28. Bf1 Kc7 29. Kd2 Kd6 30. Kc2 Ke5 31. Nd2 Ne6 32. Be2 b6 33. b4 c5 34. b5 Kf4 35. Nf1 Nf8 36. Kd2 Ng6 37. Ke1 Ne5 38. Kf2 Nxc4 39. Ng3 Nxa3 40. Nf5 Ke5 41. Ne7 Be8 42. Nc8 Nxb5 43. Bxb5 Bxb5 44. Nxa7 Bd7 0-1

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.30"]
[Round "7.1"]
[White "Li, Yunqi"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "D79"]
[WhiteElo "1667"]
[BlackElo "1801"]
[PlyCount "40"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Kornwestheim"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. g3 0-0 5. Bg2 c6 6. 0-0 d5 7. cxd5 cxd5 8. Nc3 Nc6 9. e3 Bf5 10. Nh4 Bg4 11. Qa4 a6 12. b4 Rc8 13. Bd2 Be6 14. Rab1 Nb8 15. Qd1 b5 16. a4 Qb6 17. a5 Qd6 18. Qe2 Rc4 19. Qd3 Rfc8 20. Ne2 Bd7 1/2-1/2

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.29"]
[Round "6.3"]
[White "Derr, Oleg"]
[Black "Ramming, Moritz"]
[Result "1/2-1/2"]
[ECO "B61"]
[WhiteElo "1801"]
[BlackElo "1629"]
[PlyCount "81"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Offenbach"]
[BlackTeam "Kelheim"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 Bd7 7. Qd2 Rc8 8. Be2 h6 9. Be3 a6 10. f3 e6 11. 0-0 Be7 12. f4 e5 13. Nxc6 Bxc6 14. Bf3 0-0 15. Rad1 Qc7 16. Qf2 Rfe8 17. f5 b5 18. a3 Qb7 19. Qg3 Kh8 20. Rfe1 a5 21. b4 axb4 22. axb4 Bd7 23. Rd3 Rc4 24. Qh3 Rec8 25. Nb1 d5 26. Bxh6 gxh6 27. Qxh6+ Nh7 28. exd5 Rh4 29. Qe3 Bd6 30. Be4 Rg8 31. c3 Qc8 32. Rf1 Nf6 33. Nd2 Bf8 34. Qe1 Rh7 35. Kh1 Bh6 36. g3 Bxd2 37. Rxd2 Qxc3 38. Bf3 Bxf5 39. Bg2 Ne4 40. Bxe4 Bxe4+ 41. Qxe4 1/2-1/2

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.29"]
[Round "5.5"]
[White "Mandalka, Justus"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B04"]
[WhiteElo "1775"]
[BlackElo "1801"]
[PlyCount "106"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Bad Homburg"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bf5 5. Bc4 e6 6. 0-0 Be7 7. Re1 0-0 8. Nc3 Nb6 9. Bd3 Bxd3 10. Qxd3 d5 11. Ne2 c5 12. c3 Nc6 13. Bd2 Rc8 14. dxc5 Nd7 15. b4 Ndxe5 16. Nxe5 Nxe5 17. Qg3 Nc4 18. Bh6 Bf6 19. Nd4 Kh8 20. Be3 a5 21. a3 Nxe3 22. Rxe3 b6 23. Nb3 a4 24. Nd4 bxc5 25. Ne2 d4 26. Rd3 c4 27. Rxd4 Bxd4 28. Nxd4 Qd5 29. Re1 Rfe8 30. Re5 Qd6 31. f4 g6 32. Qh4 Qd8 33. Qe1 Kg8 34. h3 Qd7 35. Qe2 f6 36. Rxe6 Rxe6 37. Qxe6+ Qxe6 38. Nxe6 Re8 39. Nd4 Re3 40. Nb5 Kf8 41. Kf2 Rd3 42. Ke2 Ke7 43. Kf2 Kd7 44. Ke1 Kc6 45. Nd4+ Kb6 46. Ne2 h6 47. g3 g5 48. fxg5 fxg5 49. Kf2 Rd2 50. Ke3 Ra2 51. g4 Rxa3 52. Kd4 Ra2 53. Ng3 Rg2 0-1

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.28"]
[Round "4.2"]
[White "Derr, Oleg"]
[Black "Kovalyov, Dima"]
[Result "1/2-1/2"]
[ECO "B10"]
[WhiteElo "1801"]
[BlackElo "1665"]
[PlyCount "10"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Offenbach"]
[BlackTeam "Solingen"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 c6 2. d3 d5 3. Nd2 e5 4. Ngf3 Bd6 5. Be2 Ne7 1/2-1/2

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.28"]
[Round "3.3"]
[White "Gersemann, Karl"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B03"]
[WhiteElo "1520"]
[BlackElo "1801"]
[PlyCount "62"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Oberschoeneweide"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 Nf6 2. e5 Nd5 3. c4 Nb6 4. d4 d6 5. f4 dxe5 6. fxe5 Bf5 7. Nc3 e6 8. Nf3 Bb4 9. Be3 c5 10. Be2 Nc6 11. Rc1 cxd4 12. Bxd4 Nxd4 13. Nxd4 Qc7 14. Nxf5 exf5 15. Qb3 Bc5 16. Qb5+ Nd7 17. Rd1 Rd8 18. Rd5 a6 19. Qa4 0-0 20. b4 Be3 21. Qc2 Nxe5 22. c5 Nc6 23. a3 Ne7 24. Qb3 Nxd5 25. Nxd5 Rxd5 26. Qxd5 f4 27. Bf3 Rd8 28. Qb3 Qe5 29. Be2 Qa1+ 30. Bd1 Qd4 31. Qc2 Bf2+ 0-1

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.27"]
[Round "2.2"]
[White "Derr, Oleg"]
[Black "Kovalskyy, Alicia"]
[Result "1-0"]
[ECO "C87"]
[WhiteElo "1801"]
[BlackElo "1577"]
[PlyCount "55"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Offenbach"]
[BlackTeam "Duesseldorf SV"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 d6 7. c3 b5 8. Bc2 Bg4 9. h3 Bh5 10. d3 h6 11. Nbd2 g5 12. g4 Nxg4 13. hxg4 Bxg4 14. Nf1 Rg8 15. N1h2 Bh5 16. Re3 g4 17. Ne1 Bg5 18. Rg3 Bh4 19. Ng2 Bxg3 20. fxg3 Qf6 21. Ne3 0-0-0 22. Nd5 Qe6 23. Bb3 Qg6 24. a4 Rgf8 25. axb5 axb5 26. Ra6 Kb7 27. Rxc6 Qg7 28. Rxc7+ 1-0

[Event "GER-chT U12"]
[Site "Magdeburg"]
[Date "2023.12.27"]
[Round "1.7"]
[White "Ensslen, Jakob"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "A48"]
[WhiteElo "1624"]
[BlackElo "1801"]
[PlyCount "44"]
[EventDate "2023.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 218 Extra"]
[Source "ChessBase"]
[SourceDate "2024.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.03.31"]
[SourceQuality "1"]
[WhiteTeam "Karlsruhe SF"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 Nf6 2. Nf3 g6 3. Bf4 Bg7 4. e3 0-0 5. Bd3 d6 6. c3 Nc6 7. Qc2 Re8 8. Nbd2 e5 9. Bg3 exd4 10. Nxd4 Nxd4 11. cxd4 Nd5 12. a3 Bxd4 13. Qc4 Bxb2 14. Rb1 Nb6 15. Qb3 Bg7 16. 0-0 Be6 17. Bc4 Nxc4 18. Nxc4 Rb8 19. Qc2 Bf5 20. Qa4 Bxb1 21. Rxb1 b5 22. Rxb5 Qd7 0-1

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.26"]
[Round "6"]
[White "Derr, Oleg"]
[Black "Mehlen, Theodor"]
[Result "1-0"]
[ECO "D36"]
[WhiteElo "1808"]
[BlackElo "1808"]
[PlyCount "83"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 c6 6. e3 Be7 7. Qc2 0-0 8. Bd3 h6 9. Bh4 Nbd7 10. Nf3 a5 11. a4 Re8 12. 0-0 Nh5 13. Bxe7 Qxe7 14. Rae1 Nhf6 15. e4 dxe4 16. Nxe4 Nxe4 17. Rxe4 Qd8 18. Rxe8+ Qxe8 19. Re1 Qf8 20. Bc4 Nb6 21. Bb3 Bd7 22. Ne5 Be6 23. Bxe6 fxe6 24. Qb3 Nd5 25. Qxb7 Rc8 26. Qd7 Qe8 27. Qxe8+ Rxe8 28. Nxc6 Kf7 29. Rc1 Nf4 30. Rc5 Nd3 31. Ne5+ Nxe5 32. dxe5 Rb8 33. Rb5 Rc8 34. g3 Rc4 35. Rxa5 Rb4 36. Ra7+ Kg6 37. a5 Rxb2 38. Re7 Kf5 39. Rxg7 Ra2 40. Rh7 Rxa5 41. Rxh6 Rxe5 42. Rh5+ 1-0

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.26"]
[Round "7"]
[White "Mohr, Alvin"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B02"]
[WhiteElo "1614"]
[BlackElo "1808"]
[PlyCount "38"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. e4 Nf6 2. e5 Nd5 3. Nc3 e6 4. Nf3 d6 5. exd6 Bxd6 6. Ne4 0-0 7. Nxd6 Qxd6 8. d4 c5 9. dxc5 Qxc5 10. Bd3 h6 11. 0-0 Nc6 12. a3 a5 13. c4 Nf6 14. b4 Qh5 15. b5 Ne5 16. Be2 Nfg4 17. h3 Nxf3+ 18. Bxf3 Qe5 19. Bd2 Qh2# 0-1

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.25"]
[Round "4"]
[White "Derr, Oleg"]
[Black "Kovalskyy, Alicia"]
[Result "1/2-1/2"]
[ECO "E08"]
[WhiteElo "1808"]
[BlackElo "1515"]
[PlyCount "45"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. g3 Nbd7 5. Bg2 Be7 6. 0-0 0-0 7. Qc2 c6 8. b3 b6 9. Bb2 Ba6 10. Rd1 Rc8 11. Nc3 dxc4 12. bxc4 Bxc4 13. Ne5 Nxe5 14. dxe5 Nd5 15. Qa4 b5 16. Qxa7 Qb6 17. Qxb6 Nxb6 18. e3 Nd5 19. Bf1 Bxf1 20. Kxf1 Nxc3 21. Bxc3 Rfd8 22. Ke2 Rf8 23. f4 1/2-1/2

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.25"]
[Round "5"]
[White "Moldenhauer, Lennart"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "B20"]
[WhiteElo "1569"]
[BlackElo "1808"]
[PlyCount "135"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. e4 c5 2. a3 e6 3. b4 Nf6 4. bxc5 Nxe4 5. d4 Qf6 6. Nf3 Bxc5 7. c3 Bb6 8. Bd3 d5 9. Qe2 h6 10. Bxe4 dxe4 11. Qxe4 Bd7 12. Ne5 Bc6 13. Nxc6 Nxc6 14. 0-0 0-0 15. Nd2 e5 16. d5 Ne7 17. Nc4 Ng6 18. Nxb6 Qxb6 19. h4 f5 20. Qe2 Rfe8 21. Be3 Qd6 22. c4 f4 23. Bd2 Nxh4 24. Qg4 Qf6 25. c5 Red8 26. d6 b6 27. d7 h5 28. Qh3 g5 29. Qb3+ Kg7 30. Qd5 Ng6 31. Bc3 Ne7 32. Qxe5 Qxe5 33. Bxe5+ Kf7 34. Rad1 bxc5 35. Bc7 Ng8 36. Bxd8 Rxd8 37. Rfe1 Nf6 38. Re5 Rxd7 39. Rxd7+ Nxd7 40. Rxg5 Ke6 41. Rxh5 c4 42. Kf1 Ne5 43. Ke2 Kd5 44. Kd2 Kd4 45. Rxe5 Kxe5 46. Kc3 Kd5 47. a4 a5 48. g4 f3 49. g5 Ke5 50. g6 Kf6 51. g7 Kxg7 52. Kxc4 Kf6 53. Kd4 Kg5 54. Ke3 Kg4 55. Ke4 Kg5 56. Kxf3 Kf5 57. Ke3 Ke5 58. Kd3 Kd5 59. Kc3 Kc5 60. Kd3 Kb4 61. f4 Kxa4 62. Kc4 Ka3 63. Kc3 Ka2 64. f5 a4 65. f6 a3 66. f7 Kb1 67. f8Q a2 68. Qf1# 1-0

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.24"]
[Round "2"]
[White "Derr, Oleg"]
[Black "Siegert, Gregor"]
[Result "0-1"]
[ECO "A62"]
[WhiteElo "1808"]
[BlackElo "2109"]
[PlyCount "86"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. g3 c5 4. d5 exd5 5. cxd5 d6 6. Nc3 g6 7. Bg2 Bg7 8. Nf3 0-0 9. 0-0 Na6 10. h3 Rb8 11. e4 b5 12. Nd2 Nb4 13. Nf3 Re8 14. a3 Na6 15. Nd2 c4 16. a4 b4 17. Nb5 Nc5 18. Nxc4 Nfxe4 19. Bf4 Ba6 20. f3 Nxa4 21. Rxa4 Bxb5 22. Rxb4 Bxc4 23. Rxc4 Nf6 24. b4 Rb5 25. Qa4 Qb6+ 26. Kh2 Nxd5 27. Rfc1 Nxf4 28. Rxf4 Bh6 29. Re4 Rd8 30. Rce1 Bg5 31. f4 Bf6 32. g4 h6 33. f5 Be5+ 34. Kh1 g5 35. Rb1 Rb8 36. Rf1 Kg7 37. Qa3 Bf6 38. Rc4 d5 39. Rc5 Rd8 40. Rfc1 Rxb4 41. Rc6 Qd4 42. Qa5 Rc4 43. R6xc4 dxc4 0-1

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.24"]
[Round "3"]
[White "John, Volkmar"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "A20"]
[WhiteElo "1646"]
[BlackElo "1808"]
[PlyCount "72"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. c4 e5 2. g3 c6 3. d4 e4 4. Bg2 Nf6 5. Nc3 d5 6. cxd5 cxd5 7. Bg5 Nbd7 8. Nh3 h6 9. Bxf6 Nxf6 10. e3 Be7 11. 0-0 0-0 12. Nf4 b6 13. Qe2 Kh8 14. Qc2 Ba6 15. Rfc1 g5 16. Nh3 Qd7 17. Qd1 Rac8 18. Qa4 Qxa4 19. Nxa4 Bb4 20. Nc3 Bxc3 21. Rxc3 Rxc3 22. bxc3 Rc8 23. Rc1 Bd3 24. f4 exf3 25. Bxf3 Be4 26. Be2 Bf5 27. Nf2 Re8 28. Nd1 Ng4 29. Bxg4 Bxg4 30. Kf2 Rc8 31. Nb2 Bf5 32. Ke2 Kg7 33. Kd2 Be6 34. a3 h5 35. h4 f6 36. Rf1 Rc7 1/2-1/2

[Event "Heusenstamm Sparkassen op-A 9th"]
[Site "Heusenstamm"]
[Date "2023.11.23"]
[Round "1"]
[White "Klein, Deniz"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "A20"]
[WhiteElo "1565"]
[BlackElo "1808"]
[PlyCount "102"]
[EventDate "2023.11.23"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 217 Extra"]
[Source "ChessBase"]
[SourceDate "2024.01.31"]
[SourceVersion "1"]
[SourceVersionDate "2024.01.31"]
[SourceQuality "1"]

1. c4 e5 2. g3 c6 3. d4 e4 4. Bg2 d5 5. Nc3 f5 6. cxd5 cxd5 7. e3 Nf6 8. Nge2 Nc6 9. 0-0 Be7 10. a3 0-0 11. b4 Be6 12. Bd2 g5 13. Qb3 Kg7 14. Rfc1 Qd7 15. Rc2 Rac8 16. Rac1 Nd8 17. Qa4 Nf7 18. Qxd7 Bxd7 19. f3 Nd6 20. fxe4 fxe4 21. h3 Rc7 22. Nb1 Rxc2 23. Rxc2 Nc4 24. Nec3 Rc8 25. Bf1 Bd6 26. g4 h6 27. Bc1 Nb6 28. Bb2 Na4 29. Rd2 Nb6 30. Bc1 Bg3 31. Re2 h5 32. Kg2 Bd6 33. gxh5 Nxh5 34. Rf2 Bg3 35. Ra2 Bb8 36. Rf2 Ng3 37. Be2 Nf5 38. Bg4 Nh4+ 39. Kf1 Bxg4 40. hxg4 Bg3 41. Re2 Rf8+ 42. Kg1 Nf3+ 43. Kg2 Be1 44. Bb2 Rh8 45. Nxe4 Rh2+ 46. Kf1 Rxe2 47. Kxe2 dxe4 48. Bc3 Bg3 49. Nd2 Nxd2 50. Bxd2 Kf7 51. Kd1 Ke6 0-1

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.27"]
[Round "6"]
[White "Derr, Oleg"]
[Black "Montalbano, Federico"]
[Result "0-1"]
[ECO "C79"]
[WhiteElo "1755"]
[BlackElo "2115"]
[PlyCount "54"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 d6 6. Re1 Bd7 7. c3 g6 8. d4 Bg7 9. Nbd2 0-0 10. Nf1 b5 11. Bc2 exd4 12. cxd4 Bg4 13. Be3 Nh5 14. h3 Bxf3 15. gxf3 Qf6 16. Nh2 Qh4 17. d5 Ne5 18. Kg2 Nc4 19. Nf1 Bxb2 20. Rb1 Bc3 21. Re2 Rae8 22. a4 Re5 23. Bc1 Nf4+ 24. Bxf4 Qxf4 25. Qc1 Rg5+ 26. Ng3 Nd2 27. Re3 Rxg3+ 0-1

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.27"]
[Round "7"]
[White "Gaertner, Johannes"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "D85"]
[WhiteElo "1532"]
[BlackElo "1755"]
[PlyCount "60"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 8. Be2 Nc6 9. Be3 0-0 10. h3 Qa5 11. Qd2 cxd4 12. cxd4 Qxd2+ 13. Kxd2 Rd8 14. Kd3 Nxd4 15. Nxd4 Bxd4 16. Bxd4 e5 17. Rac1 Rxd4+ 18. Ke3 Be6 19. Rc7 Rc8 20. Rhc1 Rxc7 21. Rxc7 Rb4 22. a4 Rxa4 23. Rxb7 Ra3+ 24. Kd2 Ra2+ 25. Ke3 a5 26. Bd1 a4 27. Rb5 a3 28. Rb1 Rb2 29. Rc1 a2 30. Bc2 Rxc2 0-1

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.26"]
[Round "4"]
[White "Derr, Oleg"]
[Black "Metzner, Luis"]
[Result "1/2-1/2"]
[ECO "B43"]
[WhiteElo "1755"]
[PlyCount "94"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Bd3 Nc6 7. Nde2 Nf6 8. 0-0 Be7 9. Bf4 d6 10. h3 0-0 11. Ng3 b5 12. a3 Bb7 13. Qd2 Ne5 14. Rad1 Rfd8 15. Qc1 Ng6 16. Be3 Rac8 17. f4 d5 18. e5 Nd7 19. Nce2 Nc5 20. Nd4 Nxd3 21. Rxd3 b4 22. axb4 Bxb4 23. Nge2 a5 24. c3 Ba6 25. Rd2 Bc5 26. Qe1 Qb6 27. Qg3 Rd7 28. Rfd1 Rb7 29. Bf2 Rcb8 30. Rc2 Bc4 31. Rdd2 Qa6 32. Nc1 a4 33. h4 Bxd4 34. Bxd4 a3 35. bxa3 Qxa3 36. Kf2 Rb1 37. Nd3 Qa1 38. Ke2 Rf1 39. Be3 Rbb1 40. Bf2 Rfd1 41. h5 Bxd3+ 42. Rxd3 Rxd3 43. Kxd3 Ne7 44. Qg5 Rb7 45. h6 Qd1+ 46. Rd2 Qb1+ 47. Rc2 Qd1+ 1/2-1/2

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.26"]
[Round "5"]
[White "Drewes, Thomas"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "D94"]
[WhiteElo "1641"]
[BlackElo "1755"]
[PlyCount "44"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 d5 5. e3 0-0 6. cxd5 Nxd5 7. Be2 c5 8. 0-0 Nc6 9. Nxd5 Qxd5 10. dxc5 Qxc5 11. Qb3 Rb8 12. Qb5 Qd6 13. Rd1 Qc7 14. Bd2 a6 15. Qb3 Be6 16. Qc2 Rfc8 17. Rac1 Qb6 18. Qb1 Qxb2 19. Qxb2 Bxb2 20. Rc2 Bf6 21. Rdc1 Rd8 22. Bc4 Bf5 0-1

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.25"]
[Round "2"]
[White "Derr, Oleg"]
[Black "Sydykov, Bayastan"]
[Result "0-1"]
[ECO "C07"]
[WhiteElo "1755"]
[BlackElo "1940"]
[PlyCount "146"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd6 7. 0-0 Nc6 8. Nb3 a6 9. Nbxd4 b5 10. Nxc6 Qxc6 11. Bd3 Bb7 12. Re1 Nf6 13. Bg5 Be7 14. c3 Rd8 15. Qc2 Qc5 16. Bxf6 Bxf6 17. Be4 Bxe4 18. Qxe4 0-0 19. Rad1 a5 20. a3 Rd6 21. Qe3 Qxe3 22. fxe3 Rfd8 23. Rxd6 Rxd6 24. e4 Rd7 25. e5 Be7 26. Kf1 h5 27. Nd4 b4 28. axb4 axb4 29. Nc6 bxc3 30. Nxe7+ Rxe7 31. bxc3 Rc7 32. Re3 Kf8 33. Ke2 Ke7 34. Kd3 f5 35. exf6+ gxf6 36. Rg3 Rc5 37. Rg7+ Kd6 38. Kd4 Rd5+ 39. Ke3 Re5+ 40. Kd3 Rf5 41. h3 Rf2 42. Ke3 Ra2 43. g3 Rg2 44. Ke4 h4 45. Kf3 Rh2 46. Rg4 hxg3 47. Kxg3 Rc2 48. Rc4 Kd5 49. Rc8 Ke4 50. Rc4+ Kf5 51. Kf3 e5 52. Rc7 Rd2 53. Ke3 Rh2 54. Rh7 Ke6 55. Rh6 Rg2 56. c4 Rg3+ 57. Kd2 e4 58. c5 Rd3+ 59. Kc2 Rd5 60. Kc3 Rxc5+ 61. Kd4 Re5 62. Ke3 Kf7 63. Rh4 f5 64. Kf4 e3 65. Kxe5 e2 66. Kxf5 e1Q 67. Rf4 Qe6+ 68. Kg5+ Kg7 69. Rg4 Qe5+ 70. Kh4+ Kh6 71. Rg8 Qf4+ 72. Rg4 Qf2+ 73. Rg3 Qe1 0-1

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.25"]
[Round "3"]
[White "Stephanblome, Felix"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B20"]
[BlackElo "1755"]
[PlyCount "27"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 c5 2. b3 e6 3. Bb2 Nc6 4. Bb5 d5 5. Bxc6+ bxc6 6. d3 Nf6 7. Nd2 Be7 8. Ngf3 Ba6 9. c4 0-0 10. Qc2 Qc7 11. 0-0 Nd7 12. Rac1 Rac8 13. Rfe1 Bf6 14. Bxf6 1/2-1/2

[Event "Wiesbaden op 32nd"]
[Site "Wiesbaden"]
[Date "2023.08.24"]
[Round "1"]
[White "Joshi, Kanad"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "C00"]
[WhiteElo "1370"]
[BlackElo "1755"]
[PlyCount "80"]
[EventDate "2023.08.24"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 216 Extra"]
[Source "ChessBase"]
[SourceDate "2023.11.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.11.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d3 d5 4. Nbd2 Nc6 5. g3 Nf6 6. Bg2 Be7 7. 0-0 0-0 8. e5 Ng4 9. Re1 Qc7 10. Qe2 f6 11. exf6 Bxf6 12. c4 Nh6 13. Nb3 Nf5 14. Nxc5 Ncd4 15. Nxd4 Nxd4 16. Qg4 Qxc5 17. Be3 dxc4 18. Rac1 Qf5 19. Qxf5 Nxf5 20. Rxc4 Nxe3 21. Rxe3 Rb8 22. b3 b5 23. Rc7 Bd4 24. Re2 Rf7 25. Rc6 Bd7 26. Rc7 Rbf8 27. Bh3 Bb6 28. Rxd7 Rxd7 29. Bxe6+ Rdf7 30. Re5 b4 31. Kg2 Re8 32. f4 Kf8 33. Bxf7 Rxe5 34. fxe5 Kxf7 35. Kf3 Ke6 36. Ke4 Bg1 37. h3 Bh2 38. d4 Bxg3 39. d5+ Ke7 40. Kd4 g6 0-1

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.11"]
[Round "7"]
[White "Derr, Oleg"]
[Black "Willems, Matthias"]
[Result "1/2-1/2"]
[ECO "B01"]
[WhiteElo "1579"]
[BlackElo "2013"]
[PlyCount "35"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. Nc3 Qa5 4. d4 Nf6 5. Nf3 Bf5 6. Bd3 e6 7. Qe2 Bxd3 8. Qxd3 c6 9. Bd2 Qc7 10. 0-0 Nbd7 11. Rfe1 Be7 12. Rad1 0-0 13. Ne4 c5 14. Nxf6+ Nxf6 15. c3 Rfd8 16. Bg5 cxd4 17. cxd4 Qb6 18. Re2 1/2-1/2

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.10"]
[Round "5"]
[White "Derr, Oleg"]
[Black "Schultze, Joerg Martin"]
[Result "1/2-1/2"]
[ECO "B45"]
[WhiteElo "1579"]
[BlackElo "1962"]
[PlyCount "106"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 f5 9. exf6 Nxf6 10. Nd6+ Bxd6 11. Qxd6 Ba6 12. Bxa6 Qa5+ 13. Bd2 Qxa6 14. Bb4 0-0-0 15. a3 Rhe8 16. f3 e5 17. 0-0-0 Re6 18. Qd3 Qxd3 19. Rxd3 d5 20. Re1 Rde8 21. Bc5 Kb7 22. b4 Nd7 23. c4 d4 24. f4 h5 25. Kc2 Nxc5 26. bxc5 exf4 27. Rxe6 Rxe6 28. Rxd4 g5 29. Kd2 Kc7 30. h4 Re3 31. hxg5 Rg3 32. Rxf4 Rxg2+ 33. Kc3 Rxg5 34. Kb4 Rg7 35. Ka5 Rh7 36. Ka6 h4 37. Rf2 h3 38. Rh2 Rh4 39. Ka5 Rh7 40. Ka6 Rh5 41. a4 Rh4 42. Ka5 Rxc4 43. Rxh3 Rxc5+ 44. Ka6 Rd5 45. a5 Kb8 46. Rh8+ Kc7 47. Rh7+ Rd7 48. Rxd7+ Kxd7 49. Kxa7 c5 50. Kb7 c4 51. a6 c3 52. a7 c2 53. a8Q c1Q 1/2-1/2

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.10"]
[Round "6"]
[White "Sydykov, Bayastan"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B45"]
[WhiteElo "1892"]
[BlackElo "1579"]
[PlyCount "38"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Qc7 9. f4 Qb6 10. c4 Bb4+ 11. Ke2 f5 12. exf6 Nxf6 13. Be3 Qa5 14. Nd6+ Ke7 15. Nxc8+ Raxc8 16. Kf2 Bc5 17. Bd3 Ng4+ 18. Qxg4 Qd2+ 19. Be2 Bxe3+ 1/2-1/2

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.09"]
[Round "4"]
[White "Nazarenus, Moritz"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2277"]
[BlackElo "1579"]
[PlyCount "57"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 e6 3. Bf4 Nf6 4. e3 c5 5. c3 Nc6 6. Nbd2 Be7 7. Bd3 0-0 8. 0-0 b6 9. Ne5 Bb7 10. Bg3 Nxe5 11. Bxe5 Bd6 12. Qf3 Bxe5 13. dxe5 Nd7 14. Qh3 h6 15. f4 f5 16. g4 fxg4 17. Qxg4 Re8 18. Rf3 Re7 19. Rh3 Kh8 20. Kf2 c4 21. Bc2 Nc5 22. Nf3 Ne4+ 23. Ke2 b5 24. Rg1 Qb6 25. Qg6 Qd8 26. Ng5 Qg8 27. Bxe4 dxe4 28. Rxh6+ gxh6 29. Qxh6+ 1-0

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.08"]
[Round "3"]
[White "Derr, Oleg"]
[Black "Biegel, Thomas"]
[Result "1-0"]
[ECO "A42"]
[WhiteElo "1579"]
[BlackElo "1965"]
[PlyCount "25"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 e5 5. d5 f5 6. exf5 gxf5 7. Qh5+ Kf8 8. Bd3 e4 9. Bc2 Bxc3+ 10. bxc3 Qf6 11. Ne2 Ne7 12. Bh6+ Kg8 13. Qe8+ 1-0

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.08"]
[Round "2"]
[White "Teschler, Ulrich"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B23"]
[WhiteElo "1966"]
[BlackElo "1579"]
[PlyCount "34"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. f4 d5 4. e5 Nc6 5. Nf3 a6 6. a4 Nge7 7. d3 Nf5 8. Ne2 h5 9. Ng3 h4 10. Nxf5 exf5 11. c3 d4 12. Be2 Be7 13. Bd2 Be6 14. c4 Qc7 15. 0-0 0-0-0 16. Qe1 Rdg8 17. Rf2 Bd7 1/2-1/2

[Event "Rhein Main op-A 25th"]
[Site "Bad Homburg"]
[Date "2023.06.07"]
[Round "1"]
[White "Derr, Oleg"]
[Black "Martin, Reiner"]
[Result "1/2-1/2"]
[ECO "B43"]
[WhiteElo "1579"]
[BlackElo "2002"]
[PlyCount "51"]
[EventDate "2023.06.07"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 215 Extra"]
[Source "ChessBase"]
[SourceDate "2023.09.30"]
[SourceVersion "1"]
[SourceVersionDate "2023.09.30"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Be2 b5 7. a3 Nf6 8. 0-0 Bb7 9. Qd3 Be7 10. f4 d6 11. Bf3 Nbd7 12. Qe2 0-0 13. Kh1 Rac8 14. e5 Bxf3 15. Nxf3 Ne8 16. Be3 g6 17. Rac1 Ng7 18. Bf2 Rfd8 19. h3 Qb7 20. Ne4 d5 21. Ned2 Nb6 22. c3 Nc4 23. Nxc4 bxc4 24. Nd4 Rb8 25. Rc2 Rdc8 26. g4 1/2-1/2

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.06.03"]
[Round "9"]
[White "Ramming, Moritz"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "B45"]
[WhiteElo "1597"]
[BlackElo "1579"]
[PlyCount "75"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. Nf3 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Bd3 0-0 11. 0-0 d4 12. Ne2 Bg4 13. f3 Bh5 14. b3 Qd6 15. Ng3 Bg6 16. Bxg6 hxg6 17. Bb2 Rad8 18. Qd2 Qc5 19. Kh1 Rd7 20. Rfe1 Rfd8 21. Ne4 Qf5 22. Nxf6+ Qxf6 23. Re4 Rd5 24. Rae1 Re5 25. Rxe5 Nxe5 26. Qb4 Qf5 27. Qd2 Nc6 28. Rd1 g5 29. h3 f6 30. b4 b5 31. Qf2 a6 32. Rd3 Kh7 33. Kg1 Kg8 34. Qd2 Qd5 35. Qd1 Qa2 36. Qa1 Qc4 37. Qd1 Qa2 38. Qa1 1/2-1/2

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.06.02"]
[Round "8"]
[White "Derr, Oleg"]
[Black "Junge, Mattheo Gabriel"]
[Result "1-0"]
[ECO "C88"]
[WhiteElo "1579"]
[BlackElo "1302"]
[PlyCount "105"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 0-0 8. a4 d5 9. axb5 dxe4 10. bxc6 exf3 11. Qxf3 e4 12. Qe3 Bf5 13. h3 Bd6 14. Nc3 Qe7 15. d4 Bg6 16. Nd5 Nxd5 17. Bxd5 Rfe8 18. Qg5 Qf8 19. Bf4 Kh8 20. c3 f5 21. Qg3 Red8 22. Bc4 a5 23. Ra4 Bf7 24. d5 h6 25. h4 Qe7 26. Rd1 Bh5 27. Rda1 Bg4 28. Rxa5 Bxf4 29. Qxf4 Rab8 30. Ra7 Rxb2 31. Qxc7 Qf6 32. Qe7 e3 33. Qxe3 Qxh4 34. c7 Rf8 35. Qd4 Qg5 36. Ra8 Rxa8 37. Rxa8+ Kh7 38. Ra1 Bf3 39. Bf1 Bxd5 40. Qxd5 Qf4 41. Qf3 Qxc7 42. Qxf5+ g6 43. Qa5 Qf7 44. Qc5 Rb7 45. Ra8 Rc7 46. Qd4 Qg7 47. Qxg7+ Kxg7 48. c4 Kf6 49. Ra6+ Kg7 50. Rd6 h5 51. Bd3 h4 52. Rxg6+ Kf7 53. Rh6 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.06.01"]
[Round "7"]
[White "Mohylnyi, Stepan"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "B51"]
[WhiteElo "2073"]
[BlackElo "1579"]
[PlyCount "93"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Nd7 4. d4 cxd4 5. Qxd4 a6 6. Bxd7+ Bxd7 7. c4 e5 8. Qd3 b5 9. Nc3 bxc4 10. Qxc4 Be6 11. Qd3 h6 12. 0-0 Nf6 13. h3 Be7 14. Be3 0-0 15. Rfd1 Qc7 16. a4 Rfb8 17. Rdb1 Bc4 18. Qc2 Bb3 19. Qd2 Qc6 20. Re1 Rb4 21. Rac1 Qb7 22. Nb5 Rxa4 23. Nxd6 Qd7 24. Nf5 Bb4 25. Qxd7 Nxd7 26. Bd2 Bxd2 27. Nxd2 Be6 28. b3 Rb4 29. Re3 Bxf5 30. exf5 Rab8 31. Rcc3 f6 32. Rc7 Rd4 33. Nc4 Nb6 34. Nxb6 Rxb6 35. Rg3 Rd1+ 36. Kh2 g5 37. fxg6 f5 38. g7 Rd8 39. h4 f4 40. Rg4 Re6 41. g3 fxg3+ 42. Kxg3 Rde8 43. Kf3 Rf6+ 44. Ke3 Rb6 45. b4 h5 46. Rg5 Rxb4 47. Rxh5 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.31"]
[Round "5"]
[White "Derr, Oleg"]
[Black "Fischermann, Simon"]
[Result "1-0"]
[ECO "C70"]
[WhiteElo "1579"]
[BlackElo "1659"]
[PlyCount "49"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 f5 5. d3 f4 6. Bxc6 dxc6 7. Nxe5 Qg5 8. Nf3 Qxg2 9. Rg1 Qh3 10. Bxf4 Bg4 11. Rg3 Qh5 12. h3 Bxh3 13. Ng5 Qxd1+ 14. Kxd1 Bd7 15. Bxc7 h6 16. Nf3 g5 17. Nbd2 Bc5 18. d4 Ba7 19. Be5 Rh7 20. Ke2 b5 21. Rh1 Rf7 22. c4 0-0-0 23. c5 Rdf8 24. Rh2 Re8 25. Bd6 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.31"]
[Round "6"]
[White "Nezhyvenko, Mykhaylo"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "A33"]
[WhiteElo "1787"]
[BlackElo "1579"]
[PlyCount "105"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. c4 Nc6 3. Nc3 e6 4. g3 d6 5. Nge2 Nf6 6. Bg2 Be7 7. 0-0 0-0 8. d4 cxd4 9. Nxd4 e5 10. Nc2 Bg4 11. Qd3 Rc8 12. b3 Qd7 13. Ne3 Rfd8 14. Nxg4 Qxg4 15. Be3 b6 16. Qe2 Qxe2 17. Nxe2 h6 18. h3 Nd7 19. Nc3 Nc5 20. Nd5 Bf8 21. Rad1 Ne7 22. Nxe7+ Bxe7 23. f4 Rc7 24. Rd5 Rb8 25. Rfd1 f6 26. f5 a5 27. g4 Kf7 28. Rb1 Ra8 29. Kf2 Rc6 30. Kf3 Ra7 31. h4 Ra8 32. Bf1 Ra7 33. a3 Ra8 34. b4 axb4 35. axb4 Nd7 36. Rd2 Ra3 37. Rd3 Rxd3 38. Bxd3 Rc7 39. Ra1 d5 40. cxd5 Bxb4 41. Bb5 Bc5 42. Bxc5 bxc5 43. d6 Rb7 44. Bc6 Rb3+ 45. Ke2 Nb6 46. Ra7+ Kf8 47. Rb7 Rb2+ 48. Kd3 Na4 49. Rxb2 Nxb2+ 50. Kc3 Nd1+ 51. Kc4 Ne3+ 52. Kxc5 Nc2 53. Kb6 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.30"]
[Round "4"]
[White "Kateryniuk, Ivan"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B22"]
[WhiteElo "1631"]
[BlackElo "1579"]
[PlyCount "106"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. c3 d5 3. exd5 Qxd5 4. d4 Nc6 5. Nf3 Bf5 6. Be2 cxd4 7. cxd4 Bxb1 8. Rxb1 e6 9. 0-0 Nf6 10. Bf4 Bd6 11. Be5 Bxe5 12. dxe5 Qxd1 13. Rfxd1 Nd5 14. Bb5 Ke7 15. Bxc6 bxc6 16. Rbc1 Rab8 17. b3 Rhc8 18. Rc2 a5 19. g3 Rb4 20. Rc5 a4 21. Nd4 axb3 22. axb3 Kd7 23. f4 Rc7 24. Kf2 Ra7 25. Rd2 Ra6 26. Ke2 Kc7 27. Kd3 Rb8 28. Rd1 Ra2 29. Rxc6+ Kd7 30. Rd6+ Ke8 31. Rd2 Nb4+ 32. Ke2 Rba8 33. Nb5 Rxd2+ 34. Kxd2 Ra2+ 35. Kc3 Nd5+ 36. Kd4 Rxh2 37. f5 Rd2+ 38. Kc5 Rc2+ 39. Kd4 Rd2+ 40. Ke4 Re2+ 41. Kd4 Rd2+ 42. Kc4 Ne3+ 43. Kc5 Rc2+ 44. Kb6 Nxf5 45. Nc7+ Ke7 46. Rd3 f6 47. g4 Nh6 48. Rd6 fxe5 49. Rxe6+ Kd7 50. g5 Ng4 51. b4 Rxc7 52. Re7+ Kxe7 53. Kxc7 e4 0-1

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.29"]
[Round "3"]
[White "Derr, Oleg"]
[Black "Berndt, Ronson"]
[Result "1-0"]
[ECO "B41"]
[WhiteElo "1579"]
[BlackElo "1475"]
[PlyCount "49"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 d6 7. Be2 Be7 8. Be3 Nbd7 9. 0-0 0-0 10. Rc1 b6 11. Nc6 Qe8 12. Bf4 e5 13. Be3 Bb7 14. Nxe7+ Qxe7 15. f3 Bc6 16. Nd5 Bxd5 17. cxd5 b5 18. Qd2 Rfc8 19. Qa5 Nc5 20. b4 Nb7 21. Rxc8+ Rxc8 22. Qxa6 Rc3 23. Bb6 Ne8 24. Bxb5 g6 25. Bxe8 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.28"]
[Round "2"]
[White "Albrecht, Neil"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "1690"]
[BlackElo "1579"]
[PlyCount "42"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Bd3 d5 6. e5 Nfd7 7. Nxe6 Bb4+ 8. c3 fxe6 9. Qh5+ Kf8 10. cxb4 Qc7 11. Bf4 Nc6 12. 0-0 Nxb4 13. Bxh7 Qc2 14. Bxc2 Rxh5 15. Bg6 Rh4 16. g3 Rg4 17. Bh5 Rxf4 18. gxf4 Nc2 19. Nc3 Nxa1 20. Rxa1 b6 21. Nb5 Ba6 1-0

[Event "GER-ch U12"]
[Site "Willingen"]
[Date "2023.05.28"]
[Round "1"]
[White "Derr, Oleg"]
[Black "Schroeder, Hannes Artur"]
[Result "1-0"]
[ECO "C78"]
[WhiteElo "1579"]
[BlackElo "1343"]
[PlyCount "75"]
[EventDate "2023.05.27"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CBM 214 Extra"]
[Source "ChessBase"]
[SourceDate "2023.07.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.07.31"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Bc5 7. c3 d6 8. d4 exd4 9. cxd4 Bb6 10. h3 h6 11. a4 Bd7 12. e5 dxe5 13. dxe5 Nh7 14. axb5 axb5 15. Qd5 Rf8 16. Rxa8 Qxa8 17. Rd1 Be6 18. Qxb5 Qb7 19. Qd3 Ke7 20. Bxe6 Rd8 21. Bd5 Nf8 22. Nc3 Ne6 23. Qb5 Kf8 24. Qxc6 Qxc6 25. Bxc6 Rxd1+ 26. Nxd1 Ke7 27. Be3 Ba5 28. Nc3 Kd8 29. Nd5 g5 30. b4 Bb6 31. Nxb6 cxb6 32. Bxb6+ Ke7 33. Nd4 Ng7 34. Be4 Ne6 35. Nxe6 Kxe6 36. Bc7 f6 37. exf6 Kxf6 38. b5 1-0

[Event "GER-chT U14"]
[Site "Kelheim"]
[Date "2022.12.28"]
[Round "3"]
[White "Derr, Oleg"]
[Black "Dorendorf, Mika"]
[Result "1/2-1/2"]
[ECO "E06"]
[WhiteElo "1517"]
[BlackElo "1783"]
[PlyCount "101"]
[EventDate "2022.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 212 Extra"]
[Source "ChessBase"]
[SourceDate "2023.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.03.31"]
[SourceQuality "1"]
[WhiteTeam "Offenbach"]
[BlackTeam "Hamburger SK"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. Nf3 d5 2. g3 Nf6 3. Bg2 e6 4. 0-0 Be7 5. d4 0-0 6. Nbd2 c5 7. c4 b6 8. Re1 Bb7 9. cxd5 exd5 10. Nf1 Nbd7 11. h4 c4 12. N1h2 b5 13. g4 Ne4 14. h5 b4 15. Nd2 Nxd2 16. Bxd2 f5 17. e3 fxg4 18. Nxg4 Nf6 19. Nxf6+ Rxf6 20. Qe2 Ba6 21. Qg4 Bc8 22. Qe2 Be6 23. e4 Rf7 24. Rac1 Rc8 25. exd5 Bxd5 26. Qg4 Bxg2 27. Kxg2 Qd5+ 28. Kg1 Rcf8 29. Re5 Qd8 30. h6 g6 31. Be3 Bh4 32. f4 Bf6 33. Re4 Qd5 34. f5 Kh8 35. fxg6 hxg6 36. Qg2 Kh7 37. Rg4 Qxg2+ 38. Kxg2 Re8 39. Bf4 Re4 40. Rxc4 g5 41. Kf3 Rxf4+ 42. Rxf4 gxf4 43. Kxf4 Bxd4+ 44. Ke4 Bxb2 45. Rxb4 Bc3 46. Rc4 Bf6 47. Kd5 Kxh6 48. Ke6 Kg7 49. Rg4+ Kf8 50. Rf4 Kg7 51. Rg4+ 1/2-1/2

[Event "GER-chT U14"]
[Site "Kelheim"]
[Date "2022.12.28"]
[Round "4"]
[White "Maltsev, Mark"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "C27"]
[WhiteElo "1428"]
[BlackElo "1517"]
[PlyCount "43"]
[EventDate "2022.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 212 Extra"]
[Source "ChessBase"]
[SourceDate "2023.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.03.31"]
[SourceQuality "1"]
[WhiteTeam "Lichtenberg Borussia"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. e4 Nf6 2. Nc3 e5 3. Bc4 Bc5 4. d3 h6 5. h3 0-0 6. f4 d6 7. f5 c6 8. Qf3 a5 9. a4 Nbd7 10. g4 Nb6 11. g5 hxg5 12. Bxg5 Nxc4 13. dxc4 Qb6 14. Bxf6 gxf6 15. Qg4+ Kh7 16. Qh4+ Kg7 17. Rh2 Rg8 18. Rg2+ Kf8 19. Qh6+ Ke7 20. Rxg8 Bf2+ 21. Kf1 Be6 22. Rxa8 1-0

[Event "GER-chT U14"]
[Site "Kelheim"]
[Date "2022.12.27"]
[Round "1"]
[White "Berresheim, Nils"]
[Black "Derr, Oleg"]
[Result "1/2-1/2"]
[ECO "D20"]
[WhiteElo "1755"]
[BlackElo "1517"]
[PlyCount "44"]
[EventDate "2022.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 212 Extra"]
[Source "ChessBase"]
[SourceDate "2023.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.03.31"]
[SourceQuality "1"]
[WhiteTeam "Essen Katernberg"]
[BlackTeam "Offenbach"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. d4 d5 2. c4 dxc4 3. e3 e5 4. Bxc4 exd4 5. exd4 Bd6 6. Nf3 Nf6 7. 0-0 0-0 8. h3 h6 9. Nc3 Nc6 10. a3 Bf5 11. Ne2 Re8 12. Bb5 a6 13. Bxc6 bxc6 14. Nf4 Qd7 15. Nd3 Nd5 16. Nde5 Bxe5 17. Nxe5 Qd6 18. b4 f6 19. Nc4 Qe6 20. Qb3 Nb6 21. Na5 Qxb3 22. Nxb3 Bd3 1/2-1/2

[Event "GER-chT U14"]
[Site "Kelheim"]
[Date "2022.12.27"]
[Round "2"]
[White "Derr, Oleg"]
[Black "Ehrlich, Patrick"]
[Result "1-0"]
[ECO "E91"]
[WhiteElo "1517"]
[BlackElo "1522"]
[PlyCount "75"]
[EventDate "2022.12.26"]
[EventType "team-swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "CBM 212 Extra"]
[Source "ChessBase"]
[SourceDate "2023.03.31"]
[SourceVersion "1"]
[SourceVersionDate "2023.03.31"]
[SourceQuality "1"]
[WhiteTeam "Offenbach"]
[BlackTeam "Birkenfeld"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "GER"]

1. Nf3 d6 2. d4 Nf6 3. c4 g6 4. Nc3 Bg7 5. e4 0-0 6. Be2 Bg4 7. h3 Bxf3 8. Bxf3 Nc6 9. Be3 e5 10. d5 Ne7 11. g4 Nd7 12. h4 f5 13. gxf5 gxf5 14. Rg1 f4 15. Bd2 Kh8 16. h5 Rg8 17. Qe2 Bh6 18. 0-0-0 Nf6 19. Bg4 Rg5 20. Bf3 Qg8 21. Rxg5 Qxg5 22. Nb5 Ne8 23. Bc3 Rb8 24. Kb1 Qf6 25. Qd3 Bg5 26. Nd4 Ng7 27. Nb5 Ne8 28. Ba5 Rc8 29. Bg4 Rb8 30. Bxc7 Nxc7 31. Nxc7 h6 32. Ne6 b6 33. Qa3 Nc8 34. Qa4 Qe7 35. Qc6 Bh4 36. f3 Bg3 37. Nc7 Kg7 38. Na6 1-0

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.21"]
[Round "6.52"]
[White "Derr, Oleg"]
[Black "Ott, Christian"]
[Result "1/2-1/2"]
[ECO "C41"]
[WhiteElo "1198"]
[PlyCount "64"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 d6 4. dxe5 dxe5 5. Qxd8+ Nxd8 6. Nxe5 Nf6 7. Bd3 Bd6 8. Nc4 Be7 9. Bd2 0-0 10. 0-0 b6 11. Nc3 Bb7 12. Rfe1 Ne6 13. e5 Nd7 14. Be4 Bxe4 15. Nxe4 Rad8 16. Rad1 Nd4 17. c3 Nc6 18. f4 f6 19. exf6 Nxf6 20. Nxf6+ Bxf6 21. Be3 Ne7 22. Bf2 Nd5 23. Bg3 Be7 24. Ne5 Nxf4 25. Bxf4 Rxf4 26. Rxd8+ Bxd8 27. Nc6 Bf6 28. Ne7+ Kf7 29. Nd5 Ra4 30. a3 c6 31. Nxf6 Kxf6 32. Kf2 Ra5 1/2-1/2

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.21"]
[Round "7.52"]
[White "Groh, Felix Alexander Qui"]
[Black "Derr, Oleg"]
[Result "0-1"]
[ECO "B40"]
[BlackElo "1198"]
[PlyCount "90"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. c3 d5 4. d4 dxe4 5. Nfd2 f5 6. Bc4 cxd4 7. cxd4 Qxd4 8. Qe2 Nf6 9. Nb3 Bb4+ 10. Bd2 Bxd2+ 11. N1xd2 Qxb2 12. 0-0 0-0 13. Nc5 Qe5 14. Ndb3 Ng4 15. g3 b6 16. h3 bxc5 17. hxg4 f4 18. gxf4 Qxf4 19. Nxc5 e3 20. Bxe6+ Bxe6 21. Nxe6 exf2+ 22. Rxf2 Qg3+ 23. Rg2 Qd6 24. Nxf8 Qxf8 25. Rf2 Qc8 26. Re1 Nd7 27. Qe6+ Kh8 28. Rfe2 h6 29. Qg6 Nf6 30. g5 Qc5+ 31. Kf1 Qxg5 32. Qxg5 hxg5 33. Rh2+ Kg8 34. Rg2 g4 35. Kf2 Rc8 36. Kg3 Rc3+ 37. Kh4 Kf7 38. Kg5 Rf3 39. Rc2 g3 40. Rc7+ Kg8 41. Kg6 Nh7 42. Re8+ Nf8+ 43. Rxf8+ Kxf8 44. Rxg7 g2 45. Kh6 Rh3+ 0-1

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.20"]
[Round "5.54"]
[White "Derr, Oleg"]
[Black "Hellmann, Alexander"]
[Result "1/2-1/2"]
[ECO "C43"]
[WhiteElo "1198"]
[PlyCount "55"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 Nf6 4. dxe5 Nxe4 5. Bd3 Nc5 6. Bc4 d6 7. Bf4 Be6 8. Bxe6 Nxe6 9. Bg3 d5 10. Nbd2 Bc5 11. Qe2 Ncd4 12. Nxd4 Nxd4 13. Qd3 c6 14. Nb3 Qb6 15. Nxc5 Qxc5 16. c3 Ne6 17. 0-0 0-0 18. Kh1 Rad8 19. f4 d4 20. cxd4 Nxd4 21. Qe4 f5 22. exf6 Rxf6 23. Rac1 Qd5 24. Qxd5+ Rxd5 25. Rce1 Nf5 26. Re8+ Kf7 27. Rb8 Rd7 28. Re1 1/2-1/2

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.20"]
[Round "4.52"]
[White "Klein, Simon"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "A45"]
[WhiteElo "1379"]
[BlackElo "1198"]
[PlyCount "107"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Bf4 c5 3. d5 b5 4. e3 Qa5+ 5. c3 d6 6. Nf3 Bb7 7. Be2 Nxd5 8. Bg3 g6 9. 0-0 Nf6 10. Nbd2 Bg7 11. b4 cxb4 12. cxb4 Qb6 13. Rc1 0-0 14. a4 a6 15. a5 Qd8 16. Bh4 Nbd7 17. Nd4 Ne5 18. N2f3 Nxf3+ 19. Bxf3 Bxf3 20. Qxf3 d5 21. Rc6 Qd7 22. Rfc1 Rfc8 23. Qe2 Rxc6 24. Rxc6 Rc8 25. Qc2 Rxc6 26. Qxc6 Qxc6 27. Nxc6 Nd7 28. Nxe7+ Kf8 29. Nxd5 Bb2 30. Nc7 Nb8 31. Bg3 Bc3 32. Nd5 Nc6 33. Bd6+ Ke8 34. Nxc3 Kd7 35. Bc5 f5 36. Nd5 h6 37. Kf1 Ne5 38. Ke2 Kc6 39. Ne7+ Kd7 40. Nd5 Kc6 41. Ne7+ Kd7 42. Ng8 h5 43. f4 Nc6 44. Nf6+ Ke6 45. Nh7 Kd5 46. Kd3 Ke6 47. Ng5+ Kf6 48. Kc3 Ne7 49. Bxe7+ Kxe7 50. Kd4 Kd6 51. Nf7+ Ke6 52. Kc5 Kxf7 53. Kb6 Ke6 54. Kxa6 1-0

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.19"]
[Round "3.45"]
[White "De Boer, Alex"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "B20"]
[WhiteElo "1213"]
[BlackElo "1198"]
[PlyCount "45"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 e6 3. Bc4 a6 4. a4 Nc6 5. d3 Nf6 6. f4 d5 7. Bb3 Qa5 8. Bd2 Qc7 9. Nf3 d4 10. Ne2 e5 11. f5 Be7 12. 0-0 0-0 13. Qe1 Bd7 14. Qg3 Rfe8 15. Bh6 Nh5 16. Qg4 g6 17. Nh4 Qd6 18. Rf3 Qf6 19. Rh3 Ng7 20. Rf1 gxf5 21. Nxf5 Bxf5 22. Rxf5 Qg6 23. Bxf7+ 1-0

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.19"]
[Round "2.43"]
[White "Derr, Oleg"]
[Black "Burlutskaia, Maria"]
[Result "1/2-1/2"]
[ECO "C45"]
[WhiteElo "1198"]
[BlackElo "1415"]
[PlyCount "72"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Nxd4 Nf6 5. Nxc6 bxc6 6. Bd3 g6 7. Bg5 h6 8. Bh4 g5 9. Bg3 Bg7 10. Nc3 Bb7 11. f4 Qe7 12. Qd2 Nh5 13. Qf2 Nxf4 14. Bxf4 gxf4 15. Qxf4 0-0-0 16. Qd2 c5 17. 0-0-0 Qe6 18. Kb1 c4 19. Bf1 Bxc3 20. Qxc3 Qxe4 21. Bxc4 Qxg2 22. Bxf7 Rhf8 23. Rhg1 Qxh2 24. Bc4 h5 25. Qa5 Rf2 26. Bd3 h4 27. Qxa7 Rf6 28. Qd4 Qf4 29. Qc3 Rdf8 30. Be2 Qh6 31. Bg4 Rd8 32. Qh3 Rf7 33. a3 Qh7 34. Rgf1 Rxf1 35. Qxf1 Qe4 36. Bxd7+ Kb8 1/2-1/2

[Event "Heusenstamm Sparkassen op-B 7th"]
[Site "Heusenstamm"]
[Date "2021.11.18"]
[Round "1.39"]
[White "Wolff, Sidney Robert"]
[Black "Derr, Oleg"]
[Result "1-0"]
[ECO "A03"]
[WhiteElo "1604"]
[BlackElo "1198"]
[PlyCount "131"]
[EventDate "2021.11.18"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "GER"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. f4 c5 2. b3 Nf6 3. Bb2 d5 4. e3 b6 5. Nf3 Bb7 6. Ne5 Nbd7 7. Bb5 a6 8. Be2 e6 9. 0-0 Bd6 10. Bf3 0-0 11. d3 Qc7 12. Nxd7 Nxd7 13. Qe1 e5 14. Qg3 f6 15. Qh3 Rae8 16. Bg4 Bc6 17. Be6+ Kh8 18. Bf5 g6 19. Bxg6 Re7 20. f5 d4 21. e4 Rg8 22. Nd2 Reg7 23. Nf3 Nf8 24. Nh4 Qe7 25. Bh5 Be8 26. Bf3 b5 27. Bc1 Qa7 28. Bh6 Rc7 29. Be2 c4 30. dxc4 d3+ 31. Be3 Bc5 32. cxd3 Bxe3+ 33. Kh1 Qd4 34. Rab1 Bf4 35. g3 Qe3 36. Qg2 Bg5 37. Nf3 Rcg7 38. Rbd1 Bh5 39. d4 Qc3 40. Rd3 Qa5 41. dxe5 Bxf3 42. Rdxf3 fxe5 43. f6 Rf7 44. Rf5 b4 45. c5 Qxc5 46. Bc4 Qc7 47. Qe2 Rg6 48. Bxf7 Qxf7 49. Qxa6 Nd7 50. Qa8+ Rg8 51. Qc6 Rg6 52. Qb5 Rxf6 53. Qxb4 Rxf5 54. Rxf5 Qg6 55. a4 Qh5 56. Qe1 Qg4 57. a5 Nc5 58. Qf1 Qxe4+ 59. Qf3 Qxf3+ 60. Rxf3 e4 61. Rf5 Be7 62. Re5 Nxb3 63. a6 Bc5 64. Rxc5 Nxc5 65. a7 e3 66. a8Q+ 1-0

