[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.09"]
[Round "7"]
[White "Cassel, Silas"]
[Black "Heister, Jonas"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "1784"]
[BlackElo "1529"]
[PlyCount "65"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 e6 3. Bf4 Bd6 4. Bg3 Nf6 5. c3 b6 6. e3 Bb7 7. Nbd2 0-0 8. Bd3 c5 9. Ne5 Nc6 10. Ndf3 Qc7 11. 0-0 h6 12. Nxc6 Bxg3 13. hxg3 Qxc6 14. Ne5 Qc7 15. g4 Nd7 16. f4 Nxe5 17. fxe5 Qe7 18. Qf3 a5 19. Qg3 Ba6 20. Bxa6 Rxa6 21. Rf4 Qg5 22. Kf2 cxd4 23. exd4 b5 24. Rh1 g6 25. Rf3 Qd2+ 26. Kg1 Qxb2 27. Qf4 g5 28. Qf6 Qc1+ 29. Kh2 Qc2 30. Kg3 Qg6 31. Rxh6 Qxf6 32. exf6 Rc6 33. Kh2 1-0

[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.09"]
[Round "6"]
[White "Heister, Jonas"]
[Black "Schlebusch, Daniel"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "1529"]
[BlackElo "1834"]
[PlyCount "60"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Bd6 5. Bd3 Nf6 6. 0-0 0-0 7. Bg5 c6 8. Nbd2 Bg4 9. c3 Nbd7 10. Qc2 h6 11. Bxf6 Nxf6 12. Rfe1 Qc7 13. h3 Bxf3 14. Nxf3 Rfe8 15. a4 a5 16. Qb3 Rxe1+ 17. Rxe1 Re8 18. Rxe8+ Nxe8 19. Qc2 Qe7 20. Qe2 Qxe2 21. Bxe2 g6 22. Bd3 Kg7 23. Kf1 Nc7 24. Ke2 Ne6 25. g3 Kf6 26. h4 g5 27. hxg5+ Nxg5 28. Nxg5 hxg5 29. Kf3 Ke6 30. Kg4 Be7 1/2-1/2

[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.08"]
[Round "4"]
[White "Heister, Jonas"]
[Black "Grosser, Walter"]
[Result "1/2-1/2"]
[ECO "E94"]
[WhiteElo "1529"]
[BlackElo "1885"]
[PlyCount "89"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. Nf3 Bg7 4. e4 d6 5. Be2 0-0 6. 0-0 e5 7. d4 exd4 8. Nxd4 Nc6 9. Nxc6 bxc6 10. Rb1 Re8 11. f3 Bd7 12. Bg5 h6 13. Bh4 Qe7 14. Qc2 g5 15. Bf2 c5 16. Rfe1 a6 17. Bf1 Qf8 18. Nd5 Nxd5 19. exd5 Rxe1 20. Rxe1 Re8 21. Rxe8 Qxe8 22. b3 Bd4 23. Qe2 Qxe2 24. Bxe2 Bxf2+ 25. Kxf2 Bf5 26. Bd1 Kg7 27. Ke3 Bb1 28. Kd2 Kf6 29. Kc3 a5 30. a3 Ke5 31. g3 f5 32. Be2 f4 33. g4 Bg6 34. Bd3 Be8 35. Be4 h5 36. h3 hxg4 37. hxg4 Bd7 38. Kd3 Kf6 39. Kc3 Ke7 40. a4 Kf6 41. Kd2 Ke5 42. Kd3 Bc8 43. Bg6 Bd7 44. Be4 Be8 45. Kc3 1/2-1/2

[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.08"]
[Round "5"]
[White "Meyer, Ulrich"]
[Black "Heister, Jonas"]
[Result "1-0"]
[ECO "C02"]
[WhiteElo "1900"]
[BlackElo "1529"]
[PlyCount "75"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Nge7 6. Bd3 Bd7 7. 0-0 Qb6 8. dxc5 Qxc5 9. Be3 Qa5 10. Nbd2 Ng6 11. Nb3 Qc7 12. Bxg6 hxg6 13. Bd4 Be7 14. Re1 b6 15. Rc1 Qb7 16. Qd2 0-0 17. Be3 Rac8 18. Bg5 Rfd8 19. Bxe7 Nxe7 20. Nbd4 a5 21. Qf4 Nf5 22. Rcd1 Rc4 23. Qg5 Rdc8 24. g4 Nxd4 25. Nxd4 b5 26. Re3 b4 27. Rh3 Be8 28. Qh4 Kf8 29. Qh8+ Ke7 30. Qxg7 bxc3 31. Qf6+ Kd7 32. bxc3 Rxc3 33. Nxe6 Qb4 34. Rxd5+ Kc6 35. Rxc3+ Kxd5 36. Nf4+ Kd4 37. Ne2+ Kd5 38. Qf3+ 1-0

[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.07"]
[Round "3"]
[White "Fedorenko, Tatyana1"]
[Black "Heister, Jonas"]
[Result "0-1"]
[ECO "C06"]
[WhiteElo "1825"]
[BlackElo "1529"]
[PlyCount "58"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. Bd3 c5 6. c3 Nc6 7. Ne2 Be7 8. 0-0 0-0 9. f4 f6 10. Nf3 Qb6 11. Kh1 a5 12. Qc2 h6 13. Nh4 f5 14. Nxf5 exf5 15. Bxf5 cxd4 16. Be6+ Kh8 17. cxd4 Nb4 18. Qg6 Nxe5 19. dxe5 Qxe6 20. Qg3 Qg4 21. Qf2 b6 22. h3 Qh5 23. Nd4 Bc5 24. Be3 Nd3 25. Qd2 Ba6 26. Rf3 Bb4 27. Qc2 Ne1 28. g4 Nxc2 29. gxh5 Nxa1 0-1

[Event "Krefeld Pfingsten op"]
[Site "Krefeld"]
[Date "2025.06.06"]
[Round "1"]
[White "Aengenheister, Dennis"]
[Black "Heister, Jonas"]
[Result "1-0"]
[ECO "E07"]
[WhiteElo "2001"]
[BlackElo "1529"]
[PlyCount "89"]
[EventDate "2025.06.06"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "GER"]
[SourceTitle "CB24_2025"]
[SourceDate "2025.06.11"]
[SourceVersion "1"]
[SourceVersionDate "2025.06.11"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 e6 3. g3 Nf6 4. Bg2 Be7 5. 0-0 0-0 6. c4 c6 7. Nc3 Nbd7 8. b3 b6 9. Bb2 Bb7 10. Nd2 c5 11. cxd5 cxd4 12. Nb5 Bxd5 13. Nxd4 Bxg2 14. Kxg2 Nc5 15. Nc4 Qd5+ 16. f3 Rfd8 17. e4 Qb7 18. Qe2 Rac8 19. Rac1 Ncd7 20. Nb5 Qb8 21. Rcd1 Nc5 22. Be5 Qa8 23. Nbd6 Bxd6 24. Nxd6 Rc6 25. b4 Nfd7 26. Ba1 Nb7 27. Qb2 f6 28. Qb3 Nxd6 29. b5 Nc5 30. Qb2 Rcc8 31. e5 Ne8 32. exf6 Nxf6 33. Qe2 Rxd1 34. Rxd1 Rd8 35. Bd4 Qd5 36. Rd2 Qb7 37. Qc4 Kf8 38. Bxc5+ bxc5 39. Rxd8+ Ke7 40. Rd3 Nd7 41. a4 Qc7 42. f4 Nb6 43. Qe4 c4 44. Re3 Nxa4 45. Qxe6+ 1-0

