[Event "Las Vegas National op"]
[Site "Las Vegas"]
[Date "1993.??.??"]
[Round "2"]
[White "Wolff, Patrick G"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "C83"]
[WhiteElo "2580"]
[PlyCount "91"]
[EventDate "1993.06.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. Nbd2 Be7 10. c3 0-0 11. Bc2 f5 12. Nb3 Qd7 13. Qe2 b4 14. c4 dxc4 15. Rd1 Qe8 16. Nbd4 Nxd4 17. Nxd4 Bc5 18. Be3 Bb6 19. Nxe6 Qxe6 20. Bxb6 cxb6 21. f3 Ng5 22. Rd6 Qc8 23. Qe3 Qc5 24. Qxc5 bxc5 25. h4 Nf7 26. Rd5 Rfe8 27. f4 g6 28. Rxc5 Rac8 29. Rxc8 Rxc8 30. Rd1 Rd8 31. Kf2 Kf8 32. Rxd8+ Nxd8 33. Ke3 Ne6 34. g3 Ke7 35. Bd1 Nc5 36. Kd4 Nd3 37. Be2 Nxb2 38. Bxc4 a5 39. Bg8 a4 40. Kc5 Nd3+ 41. Kc4 Nc1 42. Kxb4 Ne2 43. Kxa4 Nxg3 44. Kb5 Ne2 45. a4 Nxf4 46. a5 1-0

[Event "Northern California Masters"]
[Site "Berkeley"]
[Date "1990.??.??"]
[Round "3"]
[White "Arne, Mike"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "E25"]
[PlyCount "65"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 d5 5. a3 Bxc3+ 6. bxc3 c5 7. cxd5 Nxd5 8. dxc5 Qa5 9. e4 Nf6 10. Be3 0-0 11. Qb3 Nc6 12. Nh3 e5 13. Bc4 Bxh3 14. gxh3 Nd4 15. Bxd4 exd4 16. Qb4 Qc7 17. cxd4 Qf4 18. 0-0 Qe3+ 19. Rf2 Rad8 20. Rd1 Nh5 21. Qb3 Qh6 22. Qxb7 Nf4 23. Bf1 Qg5+ 24. Kh1 Qh4 25. Rfd2 Rb8 26. Qd7 f5 27. e5 Qh5 28. Bg2 Rb3 29. c6 Rxf3 30. c7 Rxh3 31. Bd5+ Kh8 32. Rg1 Rg8 33. Qxg7+ 1-0

[Event "Northern California Masters"]
[Site "Berkeley"]
[Date "1990.??.??"]
[Round "1"]
[White "McManus, Andy"]
[Black "Osbun, Erik Delwin"]
[Result "1/2-1/2"]
[ECO "C30"]
[PlyCount "89"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. f4 Bc5 3. Nf3 d6 4. Nc3 Nf6 5. Bc4 Nc6 6. d3 a6 7. fxe5 dxe5 8. Bg5 h6 9. Bxf6 Qxf6 10. Rf1 Be6 11. Nd5 Qd8 12. c3 0-0 13. Qe2 b5 14. Bb3 Bd6 15. 0-0-0 Na5 16. d4 Nxb3+ 17. axb3 exd4 18. Nxd4 Bxd5 19. exd5 Qg5+ 20. Kb1 Rae8 21. Qf3 Bxh2 22. Nf5 Bd6 23. Rd4 g6 24. Rg4 Qd2 25. Rh1 Re1+ 26. Rxe1 Qxe1+ 27. Kc2 h5 28. Re4 Qg1 29. Nxd6 cxd6 30. Re7 Qc5 31. b4 Qc8 32. Ra7 Kg7 33. Qf4 Qg4 34. Qxg4 hxg4 35. Rxa6 Rh8 36. c4 bxc4 37. Kc3 f5 38. Rc6 f4 39. Rxc4 g5 40. b5 f3 41. gxf3 gxf3 42. Kd3 Kf6 43. Ke3 Ke5 44. Rg4 Kxd5 45. Rxg5+ 1/2-1/2

[Event "Northern California Masters"]
[Site "Berkeley"]
[Date "1990.??.??"]
[Round "2"]
[White "Osbun, Erik Delwin"]
[Black "Barnard, Joe"]
[Result "0-1"]
[ECO "A38"]
[PlyCount "148"]
[EventDate "1990.??.??"]
[EventType "swiss"]
[EventRounds "5"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. c4 c5 6. Nc3 Nc6 7. d4 cxd4 8. Nxd4 Qa5 9. Nc2 d6 10. Bd2 Qh5 11. e4 Bg4 12. f3 Bh3 13. Qe2 Bxg2 14. Kxg2 Nd7 15. Rae1 Rac8 16. b3 Qa5 17. Na4 Qc7 18. Ne3 e6 19. Bc3 Nf6 20. Qb2 Nh5 21. Bxg7 Nxg7 22. Nc3 a6 23. Rc1 f5 24. Qd2 Rcd8 25. exf5 gxf5 26. f4 Qf7 27. Rfd1 h5 28. Qe2 Qg6 29. Qf3 Kh7 30. Ne2 Rd7 31. Rd2 Ne8 32. Rcd1 Rg7 33. Ng1 Nd8 34. h4 Rfg8 35. Nf1 Qg4 36. Qxg4 hxg4 37. Ne2 Kg6 38. Ne3 Nf7 39. Nd4 Kf6 40. Re2 Nc7 41. Rde1 Nd8 42. a4 Nc6 43. Nec2 Re7 44. Rd2 Nxd4 45. Rxd4 Rd8 46. Red1 Red7 47. Ne3 Ne8 48. a5 Kf7 49. c5 Ke7 50. cxd6+ Rxd6 51. Rxd6 Rxd6 52. Rxd6 Kxd6 53. Nc4+ Kc5 54. h5 Kb4 55. h6 Nf6 56. Nd6 Kxa5 57. Nxb7+ Kb4 58. Nd8 Kxb3 59. Nxe6 a5 60. Nd4+ Kb2 61. Nxf5 a4 62. Ne3 Kb3 63. Nxg4 Nh7 64. Nf2 Kc2 65. Ne4 a3 66. Ng5 Nxg5 67. fxg5 a2 68. g6 a1Q 69. g7 Qa8+ 70. Kh3 Qe8 71. g4 Qg6 72. Kg3 Kd3 73. Kf3 Kd4 74. Kg3 Ke3 0-1

[Event "American op"]
[Site "Los Angeles"]
[Date "1989.??.??"]
[Round "2"]
[White "Osbun, Erik Delwin"]
[Black "Brooks, Michael A"]
[Result "0-1"]
[ECO "C94"]
[BlackElo "2385"]
[PlyCount "78"]
[EventDate "1989.11.23"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 b5 6. Bb3 Be7 7. Re1 d6 8. c3 0-0 9. h3 Nb8 10. d3 c5 11. a4 Bb7 12. axb5 axb5 13. Rxa8 Bxa8 14. Nbd2 Qc7 15. Nf1 c4 16. Bc2 cxd3 17. Bxd3 Bc6 18. Qe2 Nbd7 19. Ng3 Rb8 20. Bd2 Bf8 21. b4 g6 22. Rc1 Qb7 23. Re1 Bg7 24. Nh2 d5 25. f3 h5 26. exd5 Nxd5 27. Ne4 Nf4 28. Bxf4 exf4 29. Qd2 Qc7 30. c4 bxc4 31. Bxc4 Ne5 32. Ba2 Rd8 33. Qc2 Nd3 34. Rd1 Qb6+ 35. Kf1 Bb5 36. Bc4 Nxb4 37. Rxd8+ Qxd8 38. Qb3 Bxc4+ 39. Qxc4 Qd1+ 0-1

[Event "American op"]
[Site "Los Angeles"]
[Date "1989.??.??"]
[Round "5"]
[White "Osbun, Erik Delwin"]
[Black "Tate, Emory"]
[Result "0-1"]
[ECO "A58"]
[BlackElo "2345"]
[PlyCount "94"]
[EventDate "1989.11.23"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 1997"]
[Source "ChessBase"]
[SourceDate "1996.11.15"]
[SourceVersion "1"]
[SourceVersionDate "1996.11.15"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 b5 4. cxb5 a6 5. bxa6 Bxa6 6. Nc3 d6 7. g3 g6 8. Bg2 Bg7 9. Nf3 0-0 10. 0-0 Nbd7 11. Qc2 Ra7 12. h3 Qa8 13. Rd1 Bc4 14. Nd2 Bxa2 15. Rxa2 Rxa2 16. Nxa2 Qxa2 17. Nc4 Rb8 18. Rd3 Rb4 19. Ne3 Qa4 20. b3 Qa8 21. Nc4 h5 22. f4 Rb7 23. Bf3 Ne8 24. Kg2 Nc7 25. f5 Nb5 26. fxg6 fxg6 27. Re3 Nf8 28. Be4 Nd4 29. Qb1 Qa6 30. Bxg6 h4 31. Bb2 Nxb3 32. Bxg7 Kxg7 33. Rxb3 Qxc4 34. Rxb7 Qxe2+ 35. Kg1 Qe3+ 36. Kf1 Qf3+ 37. Ke1 Qxg3+ 38. Ke2 Nxg6 39. Qf5 Nf4+ 40. Kd2 Qg2+ 41. Kc1 Ne2+ 42. Kb1 Nc3+ 43. Kc1 Nxd5 44. Rb8 Qg1+ 45. Kb2 Qd4+ 46. Kc1 Qf4+ 47. Qxf4 Nxf4 0-1

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.11.??"]
[Round "9"]
[White "Osbun, Erik Delwin"]
[Black "Cross, Steven"]
[Result "1-0"]
[ECO "B25"]
[PlyCount "105"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. f4 Nge7 7. Nf3 d6 8. 0-0 0-0 9. Be3 Nd4 10. Qd2 Rb8 11. a4 b6 12. Rae1 Bd7 13. b3 a6 14. Ne2 Nec6 15. g4 Nxf3+ 16. Bxf3 Nd4 17. Bg2 b5 18. axb5 axb5 19. Ng3 b4 20. e5 dxe5 21. fxe5 Bxe5 22. Bg5 f6 23. Rxe5 fxg5 24. Rxf8+ Qxf8 25. Qxg5 Nf3+ 26. Bxf3 Qxf3 27. Re3 Qd1+ 28. Kg2 Qxc2+ 29. Kh3 Bc6 30. Qe5 Qg2+ 31. Kh4 Qxh2+ 32. Kg5 h6+ 33. Kxg6 Be8+ 34. Kf6 Qh4+ 35. g5 Rb7 36. Kxe6 Bf7+ 37. Kd6 Qd4+ 38. Qxd4 cxd4 39. Re2 hxg5 40. Ne4 Bxb3 41. Nc5 Bd1 42. Rd2 Bf3 43. Nxb7 Bxb7 44. Kc5 b3 45. Rb2 g4 46. Rxb3 Bf3 47. Kxd4 g3 48. Rb5 g2 49. Rg5+ Kf7 50. Ke5 Ke7 51. d4 Kd7 52. d5 Kc7 53. Ke6 1-0

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "7"]
[White "Hanken, Jerome B"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "A10"]
[WhiteElo "2200"]
[PlyCount "91"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. c4 f5 2. Nc3 Nf6 3. g3 e6 4. Bg2 Be7 5. e3 0-0 6. Nge2 c6 7. 0-0 Na6 8. d4 d5 9. b3 Nc7 10. Bb2 Nce8 11. Qd3 Nd6 12. Ba3 Qa5 13. Bxd6 Bxd6 14. c5 Be7 15. a3 Qd8 16. b4 Qe8 17. Qd1 g5 18. f4 Ng4 19. Qd3 Qh5 20. h3 Nf6 21. Kh2 Kh8 22. Nc1 Rg8 23. Qe2 Qh6 24. Nd3 Bd7 25. fxg5 Qxg5 26. Qf2 Rg7 27. Qf4 Qh5 28. Bf3 Qe8 29. Ne2 Ne4 30. Bxe4 fxe4 31. Ne5 Kg8 32. h4 Rd8 33. Qf2 Qh5 34. Nf4 Qh6 35. Nh3 Be8 36. Qf4 Qh5 37. Rf2 Bg6 38. Ng4 Kh8 39. Nh6 Bf5 40. Nxf5 exf5 41. Qxf5 Qh6 42. Raf1 Qxe3 43. Qe5 Rdg8 44. Rf7 Qxg3+ 45. Qxg3 Rxg3 46. Rxe7 1-0

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "5"]
[White "Haring, Ronald"]
[Black "Osbun, Erik Delwin"]
[Result "0-1"]
[ECO "B30"]
[PlyCount "56"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d3 d6 4. g3 Nc6 5. Bg2 Nf6 6. 0-0 Be7 7. Re1 0-0 8. c3 Bd7 9. d4 cxd4 10. cxd4 d5 11. e5 Ne4 12. Nbd2 Nxd2 13. Bxd2 Qb6 14. Bf4 Rac8 15. h4 f6 16. exf6 Bxf6 17. Be3 Qxb2 18. Rb1 Qxa2 19. Rxb7 Rf7 20. Bh3 Nd8 21. Rb1 Ba4 22. Qe2 Qxe2 23. Rxe2 Bc2 24. Rc1 Rfc7 25. Ng5 Bf5 26. Rxc7 Rxc7 27. Nxe6 Bxe6 28. Bf4 Rc6 0-1

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "3"]
[White "Lucky, David N"]
[Black "Osbun, Erik Delwin"]
[Result "1/2-1/2"]
[ECO "A36"]
[PlyCount "99"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 0-0 5. e4 d6 6. Nge2 c5 7. 0-0 Nc6 8. d3 Rb8 9. h3 Ne8 10. f4 Nd4 11. Kh2 a6 12. f5 gxf5 13. exf5 Nxf5 14. Be4 e6 15. Bxf5 exf5 16. d4 Be6 17. dxc5 dxc5 18. Bf4 Rc8 19. Qxd8 Rxd8 20. b3 Rd3 21. Rac1 Nf6 22. Rfd1 Rfd8 23. Rxd3 Rxd3 24. Rd1 Rxd1 25. Nxd1 Ne4 26. Bc1 Kf8 27. Bb2 Bxb2 28. Nxb2 Ke7 29. Kg2 Kd6 30. Kf3 b5 31. cxb5 axb5 32. Kf4 Kd5 33. Nd1 c4 34. Ne3+ Kc5 35. bxc4 bxc4 36. Nxf5 Nf2 37. h4 Nd3+ 38. Kg5 Nb4 39. Ne3 Nxa2 40. Kh6 Kd6 41. Kxh7 Ke5 42. Kg7 Ke4 43. Nxc4 Bg4 44. Nf4 Kf3 45. h5 Bxh5 46. Nxh5 Kg4 47. Kh6 Nc3 48. Ne5+ Kf5 49. Nxf7 Ne4 50. Ng5 1/2-1/2

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "4"]
[White "Osbun, Erik Delwin"]
[Black "Bogner, Harold"]
[Result "1/2-1/2"]
[ECO "A56"]
[BlackElo "2225"]
[PlyCount "100"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 Be7 6. g3 0-0 7. Bg2 Nbd7 8. Nge2 Ne8 9. 0-0 g6 10. a3 f5 11. exf5 gxf5 12. f4 Ng7 13. Be3 Rb8 14. b4 b6 15. Rb1 Ba6 16. b5 Bc8 17. Qd2 Nf6 18. h3 e4 19. Nd1 Qe8 20. Nf2 Qg6 21. Kh2 h5 22. Rg1 Kf7 23. Bf1 Rh8 24. Nc3 Bd7 25. Be2 Rbg8 26. Rg2 h4 27. g4 fxg4 28. Nxg4 Bxg4 29. Bxg4 Nf5 30. Bxf5 Qxf5 31. Rbg1 Nh5 32. Rxg8 Rxg8 33. Rxg8 Kxg8 34. Qg2+ Ng3 35. Ne2 Bg5 36. Nxg3 Bxf4 37. Bf2 Qe5 38. Be1 Kf7 39. Qf1 Ke7 40. Qg2 e3 41. Qe2 Bxg3+ 42. Kg2 Bxe1 43. Qxe1 Qf4 44. Qf1 Qe4+ 45. Qf3 Qc2+ 46. Kg1 Qc1+ 47. Kg2 Qd2+ 48. Kf1 Qd4 49. Kg2 Qe5 50. Kf1 Qd4 1/2-1/2

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "6"]
[White "Osbun, Erik Delwin"]
[Black "Enright, Paul"]
[Result "1/2-1/2"]
[ECO "B85"]
[PlyCount "108"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. 0-0 a6 8. f4 Nc6 9. Be3 0-0 10. Kh1 Bd7 11. Qe1 b5 12. a3 Qb8 13. Bd3 Nxd4 14. Bxd4 e5 15. Nd5 Bd8 16. Bc3 Bc6 17. Qg3 Bxd5 18. exd5 Nxd5 19. Bxh7+ Kxh7 20. Qd3+ f5 21. Qxd5 e4 22. g4 Ra7 23. gxf5 Qc8 24. Qxe4 Qxf5 25. Rae1 Qxe4+ 26. Rxe4 Bf6 27. Rf3 Rc7 28. Bxf6 Rxf6 29. c3 Kg6 30. Kg2 Kf5 31. Rd4 Re6 32. Rd5+ Kf6 33. Kf2 Rce7 34. Kg3 Rd7 35. Rfd3 Ke7 36. Kg4 Kd8 37. f5 Rh6 38. Rh3 Rf6 39. Rh8+ Kc7 40. Ra8 Kb7 41. Re8 Kc6 42. Rd3 g5 43. fxg6 Rxg6+ 44. Kf5 Rh6 45. Rd2 Rdh7 46. Ree2 Rh3 47. Rf2 R7h6 48. Kg5 R3h5+ 49. Kg4 Rh4+ 50. Kf5 Rh3 51. Rg2 R3h5+ 52. Ke4 Rh3 53. Rgf2 R6h4+ 54. Kf5 Rh6 1/2-1/2

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "2"]
[White "Osbun, Erik Delwin"]
[Black "Silman, Jeremy D"]
[Result "0-1"]
[ECO "E42"]
[BlackElo "2340"]
[PlyCount "54"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nge2 cxd4 6. exd4 d5 7. a3 Be7 8. c5 0-0 9. g3 b6 10. b4 a5 11. Bb2 axb4 12. axb4 Rxa1 13. Bxa1 bxc5 14. bxc5 Nc6 15. Bg2 Ba6 16. 0-0 Qa5 17. Re1 Rb8 18. Bf3 Bc4 19. Qa4 Qxa4 20. Nxa4 Nd7 21. Bc3 Bf6 22. Rd1 Bb3 23. Ra1 Ra8 24. Nb6 Rxa1+ 25. Bxa1 Nxc5 26. Bc3 Na4 27. Nxa4 Bxa4 0-1

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "8"]
[White "Osbun, Erik Delwin"]
[Black "Waterman, Dennis L"]
[Result "0-1"]
[ECO "D31"]
[BlackElo "2295"]
[PlyCount "64"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. cxd5 exd5 4. Nc3 c6 5. Qc2 Bg4 6. Bf4 Bd6 7. Bg3 Nf6 8. Qb3 b6 9. Nf3 0-0 10. e3 Re8 11. Be2 Bxg3 12. hxg3 Nbd7 13. 0-0 Ne4 14. Rfd1 Qe7 15. Rac1 Ndf6 16. Qc2 Nxf2 17. Kxf2 Qxe3+ 18. Kf1 Nh5 19. Rd3 Nxg3+ 20. Ke1 Qh6 21. Qd2 Rxe2+ 22. Nxe2 Qh1+ 23. Neg1 Bxf3 24. Qe3 Kf8 25. Kd2 Qxg2+ 26. Kc3 Ne4+ 27. Kb3 Bg4 28. Rxc6 Qf1 29. a3 Re8 30. Rc1 Nc5+ 31. dxc5 Rxe3 32. Rxf1 Rxd3+ 0-1

[Event "CalChess Masters"]
[Site "Berkeley"]
[Date "1981.??.??"]
[Round "1"]
[White "Whitehead, Paul A"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "C91"]
[WhiteElo "2330"]
[PlyCount "72"]
[EventDate "1981.11.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. 0-0 Be7 6. Re1 b5 7. Bb3 d6 8. c3 0-0 9. d4 Bg4 10. h3 Bxf3 11. gxf3 Na5 12. Bc2 Nh5 13. f4 Nxf4 14. Bxf4 exf4 15. Qf3 Bg5 16. Nd2 c5 17. dxc5 dxc5 18. Rad1 Qe7 19. e5 Rad8 20. Qe4 g6 21. b4 Nb7 22. Nf3 Rxd1 23. Rxd1 Rc8 24. Kh2 Bh6 25. e6 fxe6 26. Ne5 Rc7 27. bxc5 Qxc5 28. Ng4 Kg7 29. Qxe6 Qe7 30. Qd5 Qc5 31. Qe6 Qe7 32. Qb6 Nc5 33. Re1 Qf7 34. Qd6 f3 35. Qe5+ Kf8 36. Qh8+ Qg8 1-0

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.20"]
[Round "3"]
[White "Osbun, Erik Delwin"]
[Black "Lobo, Richard"]
[Result "1-0"]
[ECO "E42"]
[PlyCount "89"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nge2 cxd4 6. exd4 d5 7. c5 Ne4 8. Bd2 Nxd2 9. Qxd2 Nc6 10. a3 Ba5 11. b4 Bc7 12. Rd1 Qf6 13. Qe3 Ne7 14. g3 0-0 15. Bg2 Nf5 16. Qd2 Bd7 17. 0-0 h5 18. a4 g6 19. b5 Qh8 20. Qa2 Ba5 21. Nxd5 exd5 22. Bxd5 Rab8 23. Bg2 h4 24. Nf4 hxg3 25. hxg3 Qh6 26. d5 g5 27. Nd3 Qf6 28. c6 Bc8 29. Nc5 Nd6 30. Rd3 Re8 31. Rf3 Qd4 32. Nb3 Qxd5 33. Rf6 Ne4 34. Qc2 Bd8 35. c7 Bxc7 36. Qxc7 Be6 37. Qc2 Qxb3 38. Qxe4 Bc4 39. Qg4 Bxf1 40. Qxg5+ Kf8 41. Qh6+ Ke7 42. Qg5 Kd7 43. Bxf1 Re1 44. Qd2+ Ke7 45. Qd6+ 1-0

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.20"]
[Round "4"]
[White "Schill, William"]
[Black "Osbun, Erik Delwin"]
[Result "1/2-1/2"]
[ECO "C87"]
[PlyCount "131"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. 0-0 Nf6 7. Re1 Be7 8. d4 0-0 9. Nbd2 exd4 10. cxd4 Nb4 11. Bxd7 Qxd7 12. Qb3 a5 13. a3 Na6 14. Nf1 a4 15. Qd3 d5 16. e5 Ne4 17. N3d2 f5 18. exf6 Nxf6 19. Ng3 Rae8 20. Ndf1 c5 21. Nf5 c4 22. Nxe7+ Rxe7 23. Rxe7 Qxe7 24. Qe3 Qd7 25. f3 Re8 26. Qf2 Qf5 27. Bd2 Qd3 28. Re1 Rxe1 29. Bxe1 Nb8 30. Qe3 Qxe3+ 31. Nxe3 Nc6 32. Bh4 Ne7 33. Nd1 Kf7 34. Nc3 Ke6 35. Nxa4 Kd6 36. Nc3 Nc6 37. Bf2 Ne8 38. Kf1 Nc7 39. Bg3+ Kd7 40. Bxc7 Kxc7 41. Nxd5+ Kd6 42. Ne3 b5 43. d5 Ne5 44. Nf5+ Kxd5 45. Nxg7 Nd3 46. Ke2 Nxb2 47. Kd2 Nd3 48. Nf5 Kc5 49. Ne3 b4 50. axb4+ Kxb4 51. Nc2+ Kb3 52. Nd4+ Kb2 53. Ne2 Nc5 54. g4 Nb3+ 55. Ke3 Nc1 56. Nf4 c3 57. Nd5 Nb3 58. Nxc3 Kxc3 59. f4 Nc5 60. f5 Kc4 61. h4 Kd5 62. Kf4 Nd3+ 63. Kg5 Ne5 64. Kh5 Ke4 65. g5 Kxf5 66. Kh6 1/2-1/2

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.19"]
[Round "1"]
[White "Ivanka, Maria"]
[Black "Osbun, Erik Delwin"]
[Result "0-1"]
[ECO "E63"]
[WhiteElo "2260"]
[PlyCount "118"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 g6 3. g3 Bg7 4. Bg2 0-0 5. Nf3 d6 6. d4 Nc6 7. 0-0 a6 8. e4 e5 9. d5 Ne7 10. b4 Ne8 11. Nd2 f5 12. f3 Nf6 13. c5 Bh6 14. Nc4 Bxc1 15. Rxc1 fxe4 16. fxe4 Bg4 17. Qb3 g5 18. b5 axb5 19. Nxb5 Be2 20. cxd6 cxd6 21. Nbxd6 Bxf1 22. Rxf1 Qc7 23. Nxb7 Ng6 24. d6 Qf7 25. d7 Kg7 26. d8Q Rfxd8 27. Nxd8 Rxd8 28. Qb6 Rf8 29. Nd6 Qxa2 30. Qc7+ Kh8 31. Nc4 Ng4 32. Rxf8+ Nxf8 33. Qc5 Ne6 34. Qc8+ Kg7 35. Qb7+ Kf6 36. Nb2 Qa1+ 37. Bf1 Qe1 38. Qb6 Qd2 39. Bc4 Qxh2+ 40. Kf1 Qh1+ 41. Ke2 Qxe4+ 42. Kd2 Qd4+ 43. Qxd4 Nxd4 44. Nd1 e4 45. Nc3 Ke5 46. Bf7 Nf6 47. Ke3 Nf5+ 48. Kf2 Nd6 49. Ba2 Kd4 50. Ne2+ Kd3 51. Be6 Nb5 52. Nc1+ Kd4 53. Nb3+ Ke5 54. Bc8 Nd6 55. Bh3 h5 56. Nc5 g4 57. Bf1 Nf5 58. Ba6 e3+ 59. Kg2 Ne4 0-1

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1980.07.19"]
[Round "2"]
[White "Osbun, Erik Delwin"]
[Black "Biyiasas, Peter"]
[Result "0-1"]
[ECO "C79"]
[BlackElo "2485"]
[PlyCount "62"]
[EventDate "1980.07.19"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Bd7 6. c3 Nf6 7. Re1 g6 8. d4 Qe7 9. dxe5 dxe5 10. Bg5 h6 11. Bh4 Bg7 12. Nbd2 b5 13. Bc2 0-0 14. b4 a5 15. a3 Ra7 16. Qe2 Rfa8 17. Qf1 Nd8 18. Nb3 Nb7 19. Bd3 c6 20. Nfd2 g5 21. Bg3 Nh5 22. f3 Nxg3 23. hxg3 h5 24. Rac1 Be6 25. Na1 axb4 26. axb4 g4 27. Nab3 Bh6 28. Ra1 Rxa1 29. Rxa1 Rd8 30. Rd1 h4 31. Kf2 Qg5 0-1

[Event "Fischer sim"]
[Site "Davis"]
[Date "1964.??.??"]
[Round "?"]
[White "Fischer, Robert James"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "C52"]
[PlyCount "89"]
[EventDate "1964.??.??"]
[EventType "simul"]
[EventRounds "1"]
[EventCountry "USA"]
[SourceTitle "Fischer"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. 0-0 d6 8. Qb3 Qd7 9. cxd4 Bb6 10. Bb5 Kf8 11. d5 Na5 12. Qa4 c6 13. dxc6 bxc6 14. Bd3 Nb7 15. Nc3 Nc5 16. Qc2 Ne7 17. Ba3 Ng6 18. Rfd1 Nf4 19. Bf1 Kg8 20. Ne5 Qc7 21. Nc4 Be6 22. Nxd6 Rd8 23. e5 f6 24. Bxc5 Bxc5 25. Nce4 Bxd6 26. exd6 Qc8 27. Nc5 Bd5 28. d7 Qc7 29. g3 Ne6 30. Nxe6 Bxe6 31. Bc4 Kf7 32. Bxe6+ Kxe6 33. Re1+ Kf7 34. Qc4+ Kg6 35. Re7 Rhg8 36. Rae1 h5 37. Qf7+ Kh6 38. R1e6 Rdf8 39. Rxf6+ gxf6 40. Qh7+ Kg5 41. h4+ Kg4 42. Re4+ Kh3 43. Qf5+ Rg4 44. Rxg4 hxg4 45. Qd3 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.25"]
[Round "11"]
[White "Weaver, Norris"]
[Black "Osbun, Erik Delwin"]
[Result "0-1"]
[ECO "E81"]
[PlyCount "32"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. Be3 d6 6. f3 Nbd7 7. Qd2 c5 8. Nge2 a6 9. 0-0-0 b5 10. dxc5 dxc5 11. e5 Ne8 12. Bxc5 Bxe5 13. Qd5 Nc7 14. Qc6 Rb8 15. Ng3 Ne6 16. Bb4 a5 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.24"]
[Round "10"]
[White "Osbun, Erik Delwin"]
[Black "Binns, Paul"]
[Result "0-1"]
[ECO "B07"]
[PlyCount "78"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Bg5 Bg7 5. Qd2 0-0 6. f4 c6 7. Nf3 b5 8. Bd3 Na6 9. 0-0 Nc7 10. Rae1 Re8 11. e5 Nfd5 12. f5 Nxc3 13. Qxc3 gxf5 14. Nh4 h6 15. Bf4 dxe5 16. Bxe5 Bxe5 17. dxe5 e6 18. Qxc6 Rb8 19. Rf4 Bb7 20. Qc5 Nd5 21. Rd4 a6 22. Nf3 Rc8 23. Qa7 Qc7 24. Rxd5 Bxd5 25. Qxa6 Qc5+ 26. Kh1 Red8 27. Qa5 Bxf3 28. gxf3 Qf2 29. Rf1 Qc5 30. Qe1 Kh7 31. Qe2 Rg8 32. c3 b4 33. cxb4 Qxb4 34. b3 Qb6 35. Qe1 Rg6 36. Bc4 Rcg8 37. a4 Qd4 38. a5 Rg2 39. a6 Qf4 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.23"]
[Round "9"]
[White "Byrne, Robert Eugene"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "E62"]
[PlyCount "57"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 0-0 5. Nc3 d6 6. Nf3 Nc6 7. 0-0 Bg4 8. b3 Bxf3 9. Bxf3 Nd7 10. Be3 e5 11. d5 Ne7 12. Rc1 f5 13. Bg2 Nf6 14. Bd2 Nh5 15. e3 Kh8 16. f4 Qd7 17. fxe5 dxe5 18. Na4 Rae8 19. Nc5 Qd6 20. Nxb7 Qb6 21. Na5 f4 22. c5 Qb5 23. gxf4 exf4 24. a4 Qd3 25. e4 Bd4+ 26. Kh1 f3 27. Bxf3 Nxd5 28. exd5 Re4 29. Bh6 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.22"]
[Round "8"]
[White "Osbun, Erik Delwin"]
[Black "Henin, Charles"]
[Result "1-0"]
[ECO "B07"]
[PlyCount "81"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. d4 d6 6. Nc3 Nbd7 7. e4 e5 8. Bg5 h6 9. Bc1 c6 10. h3 exd4 11. Nxd4 Re8 12. Re1 a5 13. a4 Kh7 14. Nb3 Ne5 15. Kh2 Be6 16. Nd4 Qb6 17. f4 Neg4+ 18. Kg1 Nxe4 19. Rxe4 Bf5 20. hxg4 Bxe4 21. Nxe4 Bxd4+ 22. Kh2 d5 23. Nc3 Re7 24. Ra3 Rae8 25. Rb3 Qc5 26. Bd2 Bf2 27. Qf3 Qd4 28. Nb1 Re2 29. Bc3 Qd1 30. Be5 b6 31. Na3 Qg1+ 32. Kh3 Bc5 33. Qxe2 f6 34. Rf3 fxe5 35. fxe5 Kg7 36. e6 Re7 37. Qe5+ Kg8 38. Qb8+ Kh7 39. Rf7+ Rxf7 40. exf7 Qf2 41. Qg8# 1-0

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.21"]
[Round "7"]
[White "Bourke, Alan W"]
[Black "Osbun, Erik Delwin"]
[Result "0-1"]
[ECO "C73"]
[PlyCount "76"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. Bxc6+ bxc6 6. d4 f6 7. Be3 Ne7 8. Nc3 Ng6 9. Qe2 Be7 10. Rd1 Bd7 11. Qc4 Qb8 12. h3 Qb7 13. 0-0 Nf4 14. Bxf4 exf4 15. a4 a5 16. Qd3 g5 17. e5 fxe5 18. dxe5 0-0-0 19. Ne4 g4 20. e6 Bxe6 21. Nfg5 Bd5 22. hxg4 Rhg8 23. Nf3 Rxg4 24. Nf6 Bxf3 25. Qxf3 Rg7 26. Qh3+ Kb8 27. Rd3 Ka8 28. Rb3 Qa7 29. Nh5 Rf7 30. Qe6 Rdf8 31. Qd7 Qc5 32. Qxc7 Bh4 33. Rb8+ Rxb8 34. Qxf7 Rxb2 35. Nxf4 Bxf2+ 36. Kh1 Qxc2 37. Ne6 Qg6 38. Qd7 Qh6# 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.20"]
[Round "6"]
[White "Osbun, Erik Delwin"]
[Black "Addison, William G"]
[Result "1/2-1/2"]
[ECO "B63"]
[PlyCount "80"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 h6 8. Bxf6 gxf6 9. 0-0-0 a6 10. f4 Bd7 11. Be2 h5 12. Rhf1 Qb6 13. Nb3 0-0-0 14. Kb1 Kb8 15. Rf3 h4 16. Qe1 Be7 17. Rh3 Rdg8 18. g4 hxg3 19. Rxh8 Rxh8 20. Qxg3 Bf8 21. h4 Bc8 22. h5 Bh6 23. Nd2 Rd8 24. Nc4 Qc7 25. Qf3 f5 26. Ne3 fxe4 27. Nxe4 d5 28. Ng5 f6 29. Nh3 e5 30. Nxd5 e4 31. Qxe4 Rxd5 32. Qxd5 Bxh3 33. f5 Nb4 34. Qd8+ Qxd8 35. Rxd8+ Kc7 36. Rh8 Bg5 37. a3 Nc6 38. Bd3 Ne5 39. Be4 Nc4 40. Ka2 Nd6 1/2-1/2

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.18"]
[Round "5"]
[White "Nowak, John"]
[Black "Osbun, Erik Delwin"]
[Result "0-1"]
[ECO "D23"]
[PlyCount "84"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Qa4+ Bd7 5. Qxc4 e6 6. e3 a6 7. Nc3 b5 8. Qb3 c5 9. g3 Nc6 10. dxc5 Bxc5 11. Bg2 0-0 12. 0-0 Qb6 13. Qc2 Rac8 14. Ne4 Be7 15. Nfg5 Nxe4 16. Nxe4 Nb4 17. Qd2 Rfd8 18. Nc3 Be8 19. Qe2 Nd3 20. Rd1 Nxc1 21. Raxc1 b4 22. Nb1 Bb5 23. Rxd8+ Qxd8 24. Qe1 Rxc1 25. Qxc1 Qa5 26. a3 Bd3 27. Bf1 Bxb1 28. Qxb1 bxa3 29. bxa3 Qxa3 30. Qb8+ Bf8 31. Qe8 a5 32. Bb5 g6 33. Ba4 Kg7 34. Qb5 Qa1+ 35. Kg2 Bb4 36. e4 Qd4 37. e5 g5 38. Bc2 Bc3 39. Qe2 Qxe5 40. Qf3 Qd4 41. Qh5 h6 42. f4 Qd2+ 0-1

[Event "US Open-62"]
[Site "San Francisco"]
[Date "1961.08.16"]
[Round "3"]
[White "Celle, Ojars"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "E90"]
[PlyCount "115"]
[EventDate "1961.08.14"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 0-0 5. Nf3 d6 6. Be3 Ng4 7. Qd2 Na6 8. Be2 c5 9. 0-0 f5 10. h3 Nxe3 11. fxe3 Bd7 12. a3 Qe8 13. Rab1 Rd8 14. b4 b6 15. bxc5 dxc5 16. e5 cxd4 17. exd4 Bc6 18. Qf4 Nc7 19. d5 Ba8 20. Nd4 e6 21. d6 Na6 22. Ncb5 Rf7 23. Bf3 Bxf3 24. Rxf3 Qd7 25. Re3 Rc8 26. Rc1 Kh8 27. Nf3 Rc5 28. Ng5 Rf8 29. Nd4 Re8 30. Nb3 Rcc8 31. Qd4 Nb8 32. c5 Nc6 33. Qa4 h6 34. Nf3 Qb7 35. Qb5 Rb8 36. Nbd4 Nxd4 37. Nxd4 Qd5 38. Nf3 Rec8 39. d7 Rxc5 40. Rxc5 Qxc5 41. Qxc5 bxc5 42. Rd3 Rd8 43. Kf2 Kg8 44. Rd6 Kf7 45. Rc6 Rxd7 46. Rxc5 Bf8 47. Ra5 Be7 48. Ke3 Bd8 49. Rb5 Bb6+ 50. Ke2 Rd5 51. Rxd5 exd5 52. Kd3 Ke6 53. g4 g5 54. gxf5+ Kxf5 55. a4 h5 56. e6 Bc5 57. Nd4+ Bxd4 58. e7 1-0

[Event "San Jose m"]
[Site "San Jose"]
[Date "1961.??.??"]
[Round "1"]
[White "Blackstone, John"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "C72"]
[PlyCount "101"]
[EventDate "1961.??.??"]
[EventType "match"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c4 Bd7 6. Nc3 Nf6 7. 0-0 Be7 8. d4 0-0 9. d5 Nb8 10. Bc2 a5 11. Be3 Ng4 12. Bd2 Na6 13. h3 Nf6 14. a3 c6 15. dxc6 bxc6 16. Be3 Qc7 17. Qe2 Rfb8 18. b3 Nc5 19. Rab1 Ne6 20. b4 axb4 21. axb4 Ra3 22. Na4 c5 23. b5 Nxe4 24. Bc1 Rxa4 25. Qxe4 f5 26. Qd5 Rb4 27. Rxb4 cxb4 28. Bxf5 Kf7 29. Ng5+ Bxg5 30. Bxg5 g6 31. Be4 Qc5 32. Be3 Qxd5 33. Bxd5 Ke7 34. Rb1 Nc7 35. Bf3 d5 36. b6 Na6 37. Bxd5 Be6 38. Bxe6 Kxe6 39. Ra1 b3 40. Rb1 Kd6 41. Rxb3 Nc5 42. Rb5 Nd7 43. Kf1 Kc6 44. Ke2 Nxb6 45. Rxb6+ Rxb6 46. Bxb6 Kxb6 47. Kd3 Kc5 48. Ke4 Kxc4 49. Kxe5 Kd3 50. f4 Ke3 51. g4 1-0

[Event "San Jose m"]
[Site "San Jose"]
[Date "1961.??.??"]
[Round "3"]
[White "Blackstone, John"]
[Black "Osbun, Erik Delwin"]
[Result "1/2-1/2"]
[ECO "C72"]
[PlyCount "57"]
[EventDate "1961.??.??"]
[EventType "match"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. 0-0 Bg4 6. h3 h5 7. d4 Bxf3 8. Qxf3 exd4 9. c4 Qf6 10. Qb3 0-0-0 11. Bxc6 bxc6 12. Qa4 Kb7 13. Nd2 Ne7 14. b4 Ra8 15. Rb1 g5 16. Nf3 Bh6 17. Bb2 Rhg8 18. Nxd4 g4 19. Nxc6 Qh4 20. b5 gxh3 21. bxa6+ Kc8 22. Nxe7+ Qxe7 23. Qc6 Rxg2+ 24. Kh1 Bf4 25. Qxa8+ Kd7 26. Qd5 Rh2+ 27. Kg1 Rg2+ 28. Kh1 Rh2+ 29. Kg1 1/2-1/2

[Event "San Jose m"]
[Site "San Jose"]
[Date "1961.??.??"]
[Round "2"]
[White "Osbun, Erik Delwin"]
[Black "Blackstone, John"]
[Result "1-0"]
[ECO "D53"]
[PlyCount "45"]
[EventDate "1961.??.??"]
[EventType "match"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 h6 6. Bf4 0-0 7. Rc1 c6 8. Nf3 b6 9. cxd5 Nxd5 10. Bg3 Bb7 11. Bd3 c5 12. 0-0 Nc6 13. Qe2 a6 14. Rfd1 cxd4 15. exd4 Qd7 16. Nxd5 Qxd5 17. Be4 Qd7 18. Bxc6 Bxc6 19. Ne5 Bb5 20. Nxd7 Bxe2 21. Re1 Bb5 22. Nxf8 Kxf8 23. Bc7 1-0

[Event "San Jose m"]
[Site "San Jose"]
[Date "1961.??.??"]
[Round "4"]
[White "Osbun, Erik Delwin"]
[Black "Blackstone, John"]
[Result "1-0"]
[ECO "A34"]
[PlyCount "117"]
[EventDate "1961.??.??"]
[EventType "match"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. Nf3 c5 2. c4 Nf6 3. Nc3 Nc6 4. g3 d5 5. cxd5 Nxd5 6. Bg2 Nc7 7. 0-0 e5 8. b3 Be6 9. Bb2 Be7 10. Rc1 f6 11. Na4 Na6 12. e3 Qd7 13. d4 cxd4 14. exd4 e4 15. Nh4 Bg4 16. f3 exf3 17. Bxf3 Bxf3 18. Qxf3 Rd8 19. Qh5+ Kf8 20. Ng6+ Kg8 21. Nxh8 Kxh8 22. Rf4 Nab4 23. Rh4 h6 24. Qg6 b5 25. Nc5 Bxc5 26. dxc5 Qd2 27. Rxh6+ Qxh6 28. Qxh6+ gxh6 29. Bxf6+ Kg8 30. Bxd8 Nxd8 31. a3 Nbc6 32. Rd1 Nf7 33. Rd7 a5 34. Kf2 Kf8 35. Ke3 Nfe5 36. Rc7 Ke8 37. Ke4 Kd8 38. Rb7 b4 39. axb4 axb4 40. Kd5 Kc8 41. Rh7 Kb8 42. Rxh6 Kb7 43. Re6 Ng6 44. h4 Nge7+ 45. Kd6 Nf5+ 46. Kd7 Nb8+ 47. Ke8 Nxg3 48. Rb6+ Kc7 49. Rxb4 Na6 50. Rg4 Nf5 51. b4 Ne3 52. Rg7+ Kc8 53. h5 Nf5 54. Rg5 Nc7+ 55. Kf7 Nd4 56. h6 Nde6 57. Rg8+ Nd8+ 58. Rxd8+ Kxd8 59. h7 1-0

[Event "US Open-60"]
[Site "Omaha"]
[Date "1959.07.29"]
[Round "9"]
[White "Osbun, Erik Delwin"]
[Black "Carr, William"]
[Result "0-1"]
[ECO "C18"]
[PlyCount "80"]
[EventDate "1959.07.20"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Nf3 b6 8. a4 Ba6 9. Bxa6 Nxa6 10. 0-0 Rc8 11. Ne1 Ne7 12. Qd3 Nb8 13. a5 cxd4 14. axb6 Qxb6 15. cxd4 Nbc6 16. c3 Na5 17. Ba3 Nb3 18. Rb1 a5 19. Nc2 a4 20. Ne3 Qc7 21. Bb4 Nc6 22. Bd6 Qb6 23. f4 g6 24. g4 Nca5 25. f5 Nc4 26. Nxc4 dxc4 27. Qf3 gxf5 28. gxf5 Rg8+ 29. Kh1 Qc6 30. fxe6 Qxf3+ 31. Rxf3 fxe6 32. Rf6 Rg6 33. Rf8+ Kd7 34. Rf7+ Kc6 35. Rxh7 Ra8 36. Rb2 Rag8 37. h4 Rg3 38. Kh2 Rxc3 39. Ra2 Nxd4 40. Rxa4 Nf3+ 0-1

[Event "US Open-60"]
[Site "Omaha"]
[Date "1959.07.26"]
[Round "6"]
[White "Donovan, Jeremiah"]
[Black "Osbun, Erik Delwin"]
[Result "1-0"]
[ECO "A85"]
[PlyCount "35"]
[EventDate "1959.07.20"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 Bb4+ 5. Nc3 0-0 6. Nf3 d5 7. Qb3 Be7 8. 0-0 c6 9. Ne5 Qe8 10. f3 b6 11. e4 fxe4 12. fxe4 Bb7 13. cxd5 cxd5 14. exd5 Qd8 15. d6 Bxg2 16. Qxe6+ Kh8 17. dxe7 Qxd4+ 18. Kxg2 1-0

[Event "US Open-60"]
[Site "Omaha"]
[Date "1959.07.24"]
[Round "5"]
[White "Osbun, Erik Delwin"]
[Black "Sherwin, James T"]
[Result "0-1"]
[ECO "E80"]
[PlyCount "80"]
[EventDate "1959.07.20"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 c6 6. Bg5 Nbd7 7. Qd2 a6 8. Bd3 b5 9. cxb5 axb5 10. Nge2 0-0 11. 0-0 e5 12. a4 exd4 13. Nxd4 Qb6 14. Be3 Ng4 15. a5 Bxd4 16. axb6 Bxe3+ 17. Kh1 Bxd2 18. Rxa8 Nxb6 19. Rb8 Nd7 20. Ra8 Nge5 21. Rd1 Be3 22. Be2 Nb6 23. Raa1 Bc5 24. Na2 b4 25. Nc1 Be6 26. Nd3 Nxd3 27. Bxd3 Bd4 28. Ra6 Rb8 29. Bb5 c5 30. Be2 Kg7 31. g4 g5 32. Kg2 Nc4 33. Bxc4 Bxc4 34. Rxd6 Bxb2 35. Rc6 Rb5 36. Rd8 b3 37. h4 h6 38. f4 gxf4 39. g5 hxg5 40. hxg5 Be6 0-1

[Event "US Open-60"]
[Site "Omaha"]
[Date "1959.07.23"]
[Round "4"]
[White "Osbun, Erik Delwin"]
[Black "Warren, James E"]
[Result "1-0"]
[ECO "D35"]
[PlyCount "89"]
[EventDate "1959.07.20"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 d5 6. e3 Nbd7 7. cxd5 exd5 8. Bd3 c6 9. Qc2 0-0 10. Nge2 Re8 11. 0-0-0 a5 12. g4 Be7 13. f3 b5 14. Bg3 a4 15. Nxb5 Bb7 16. Nc7 c5 17. Nxe8 Qxe8 18. Nc3 c4 19. Bf5 a3 20. b3 Rc8 21. b4 Bxb4 22. Rhe1 Qd8 23. e4 Qa5 24. Re3 Bc6 25. e5 Ne8 26. e6 fxe6 27. Bxe6+ Kh8 28. h4 Nc7 29. Bf7 Rf8 30. Bxc7 Qxc7 31. Nxd5 Bxd5 32. Bxd5 Qf4 33. Qe4 Qh2 34. Re2 Qxh4 35. Qg6 Qg3 36. Be4 Qf4+ 37. Kc2 Nf6 38. Qf5 Nxe4 39. Qxf4 Rxf4 40. fxe4 Rxg4 41. d5 Ba5 42. e5 Kg8 43. e6 Kf8 44. e7+ Ke8 45. d6 1-0

[Event "USA Junior-ch"]
[Site "Omaha"]
[Date "1959.07.13"]
[Round "8"]
[White "Osbun, Erik Delwin"]
[Black "Harmon, Clark R"]
[Result "1-0"]
[ECO "A48"]
[PlyCount "53"]
[EventDate "1959.07.13"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. e3 Bg7 4. Bd3 0-0 5. 0-0 d6 6. b3 c5 7. Bb2 Nc6 8. a3 a6 9. c4 Qc7 10. d5 Nb8 11. Nc3 e6 12. dxe6 fxe6 13. Qc2 Nc6 14. Ne2 e5 15. Ng5 Ne7 16. Ng3 Bd7 17. Rae1 h6 18. Nf3 Be6 19. Bxg6 Nxg6 20. Qxg6 Bf7 21. Qc2 b5 22. Nh4 Rfd8 23. f4 exf4 24. Rxf4 Ne8 25. Ref1 Rd7 26. Ngf5 Bxb2 27. Nxh6+ 1-0

