[Event "New York op"]
[Site "New York"]
[Date "1985.??.??"]
[Round "5"]
[White "Bellizzi, Douglas"]
[Black "Siff, Boris"]
[Result "1-0"]
[ECO "D43"]
[PlyCount "55"]
[EventDate "1985.03.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 e6 5. Qb3 Nbd7 6. Bg5 Qa5 7. Bd2 Qd8 8. g3 Nb6 9. cxd5 exd5 10. Bg2 Bd6 11. 0-0 0-0 12. a4 a5 13. Bg5 Be7 14. Rad1 Be6 15. Ne5 Nfd7 16. Bxe7 Qxe7 17. Nxd7 Nxd7 18. Qxb7 Rfc8 19. Qb3 Rab8 20. Qc2 f5 21. e3 Qb4 22. Rb1 Qf8 23. Qd2 Rb3 24. Ne2 Rb4 25. Nf4 Qd6 26. b3 Rcb8 27. Qc3 Nb6 28. Rbc1 1-0

[Event "New York op"]
[Site "New York"]
[Date "1985.??.??"]
[Round "2"]
[White "Siff, Boris"]
[Black "Torre, Eugenio"]
[Result "0-1"]
[ECO "C02"]
[BlackElo "2540"]
[PlyCount "92"]
[EventDate "1985.03.??"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 c5 2. c3 e6 3. e4 d5 4. e5 Nc6 5. Nf3 Bd7 6. Be2 f6 7. Bf4 Qb6 8. exf6 gxf6 9. Qb3 Qxb3 10. axb3 cxd4 11. cxd4 Nge7 12. Nc3 Nf5 13. Rd1 Bd6 14. Bxd6 Nxd6 15. Nb5 Nxb5 16. Bxb5 Nb4 17. Bxd7+ Kxd7 18. Kd2 Rhc8 19. Rc1 Rc6 20. Rxc6 bxc6 21. Ra1 a5 22. Ne1 e5 23. Nd3 Nxd3 24. Kxd3 Rb8 25. dxe5 fxe5 26. Rxa5 Rxb3+ 27. Kc2 Rb7 28. f4 exf4 29. Ra4 f3 30. gxf3 Kd6 31. Rf4 Ke5 32. Rf8 Kd4 33. f4 Rg7 34. b4 Kc4 35. Rf6 Rc7 36. Re6 Kxb4 37. f5 Kc4 38. f6 c5 39. Re5 Rf7 40. Re6 Ra7 41. Kb2 Kd4 42. Re7 Ra6 43. Rxh7 Rxf6 44. Rh3 Rf2+ 45. Kc1 c4 46. Kd1 c3 0-1

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "9"]
[White "Batchelder, Wiliam"]
[Black "Siff, Boris"]
[Result "1/2-1/2"]
[ECO "E42"]
[WhiteElo "2210"]
[PlyCount "100"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[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. e3 c5 5. Nge2 d6 6. a3 Ba5 7. Rb1 0-0 8. b4 Bc7 9. g3 cxd4 10. exd4 d5 11. c5 a6 12. Bg2 b5 13. 0-0 Nc6 14. Bf4 Ne8 15. Be3 Bd7 16. Re1 Ne7 17. Nf4 Bc6 18. a4 Qd7 19. Ra1 Nf6 20. Nd3 Ne4 21. axb5 axb5 22. Qc2 Nf5 23. Rad1 Nxe3 24. Rxe3 Nxc3 25. Qxc3 Ra4 26. Ra1 Rxa1+ 27. Qxa1 Ra8 28. Qc1 Qc8 29. Rf3 Qa6 30. Bf1 f6 31. Re3 Re8 32. Bh3 e5 33. Qd1 e4 34. Nf4 Bxf4 35. gxf4 Ra8 36. Be6+ Kh8 37. Kg2 Qa1 38. Qh5 g6 39. Qh4 Qxd4 40. Qh6 f5 41. Ra3 Qf6 42. Rxa8+ Bxa8 43. Bd7 d4 44. Bxb5 d3 45. Qg5 e3+ 46. f3 Qb2+ 47. Kh3 Bxf3 48. Qd8+ Kg7 49. Qe7+ Kh6 50. Qg5+ Kg7 1/2-1/2

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "5"]
[White "Nelson, Terry"]
[Black "Siff, Boris"]
[Result "0-1"]
[ECO "A25"]
[PlyCount "28"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 Nc6 3. g3 e5 4. Bg2 Bb4 5. d3 Bxc3+ 6. bxc3 d6 7. Rb1 0-0 8. e3 e4 9. d4 Na5 10. d5 Nxc4 11. Qd4 Nb6 12. Bxe4 Nxe4 13. Qxe4 Qf6 14. Qd3 Bf5 0-1

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "12"]
[White "Root, Douglas"]
[Black "Siff, Boris"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "2400"]
[PlyCount "37"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. c3 d3 5. Bxd3 d6 6. h3 Ne5 7. 0-0 Nxd3 8. Qxd3 Be7 9. Bf4 Nf6 10. c4 Nd7 11. Nc3 Bf6 12. Rad1 Bxc3 13. Qxc3 f6 14. Nd4 Kf7 15. b4 Qe7 16. c5 dxc5 17. Qb3+ Kg6 18. Nf5 Qxe4 19. Nh4+ 1-0

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "8"]
[White "Siff, Boris"]
[Black "Brooks, Michael A"]
[Result "1/2-1/2"]
[ECO "E70"]
[BlackElo "2300"]
[PlyCount "46"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Bg5 c5 6. d5 h6 7. Bh4 Qa5 8. Qd2 0-0 9. Bd3 e6 10. Nge2 exd5 11. exd5 Nbd7 12. f4 Re8 13. h3 a6 14. 0-0 b5 15. b3 b4 16. Na4 Ne4 17. Bxe4 Bxa1 18. Rxa1 Rxe4 19. Ng3 Re8 20. Re1 Bb7 21. Ne4 Qc7 22. f5 gxf5 23. Qxh6 Rxe4 1/2-1/2

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "2"]
[White "Siff, Boris"]
[Black "Taylor, Robert V"]
[Result "1/2-1/2"]
[ECO "D90"]
[PlyCount "102"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. Qb3 Nb6 6. Bf4 Bg7 7. e3 0-0 8. Nf3 c6 9. Be2 Be6 10. Qc2 Nd5 11. Bg3 Qa5 12. Nd2 Na6 13. 0-0 Qd8 14. Bxa6 Nb4 15. Qc1 Nxa6 16. Nce4 Bd5 17. Nc5 Nxc5 18. Qxc5 b6 19. Qa3 f5 20. Rfd1 Qe8 21. Be5 Qf7 22. b3 Qe6 23. Bxg7 Kxg7 24. Qa6 Qf6 25. Qb7 Rfb8 26. Qa6 e5 27. dxe5 Qxe5 28. Nf3 Bxf3 29. gxf3 Qe7 30. Rd3 Rd8 31. Rad1 Rxd3 32. Qxd3 c5 33. f4 Re8 34. Qa6 Kh6 35. Qd3 Kg7 36. Qc3+ Kg8 37. Qc4+ Kg7 38. Qd5 Kh6 39. Qd7 Kg7 40. Rd5 Kf7 41. Qb5 Rd8 42. Re5 Qd7 43. Qc4+ Kf8 44. h3 Qd1+ 45. Kg2 Qd7 46. a4 Qb7+ 47. Kg3 Qh1 48. Qe6 Qg1+ 49. Kf3 Qh1+ 50. Kg3 Qg1+ 51. Kf3 Qh1+ 1/2-1/2

[Event "US Open-82"]
[Site "Palo Alto"]
[Date "1981.??.??"]
[Round "11"]
[White "Siff, Boris"]
[Black "Thinnsen, James A"]
[Result "1-0"]
[ECO "D73"]
[BlackElo "2220"]
[PlyCount "97"]
[EventDate "1981.08.02"]
[EventType "swiss"]
[EventRounds "12"]
[EventCountry "USA"]
[SourceTitle "EXT 2000"]
[Source "ChessBase"]
[SourceDate "1999.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1999.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. g3 Bg7 5. Bg2 c6 6. Nf3 0-0 7. cxd5 cxd5 8. Ne5 Nc6 9. Nxc6 bxc6 10. 0-0 e5 11. dxe5 Ng4 12. Bf4 Nxe5 13. Rc1 Nc4 14. b3 Nb6 15. Qd2 Re8 16. Rfd1 Bf5 17. Be3 Rc8 18. Bc5 h5 19. e3 h4 20. Ne2 hxg3 21. hxg3 Bg4 22. Re1 Rc7 23. Nd4 Qf6 24. Qa5 Rb8 25. Rc3 Bd7 26. Qa3 Nc8 27. Rec1 Rcb7 28. Bf1 Kh7 29. Bg2 Kg8 30. Qa6 Rc7 31. Qa3 Rcb7 32. R3c2 g5 33. Qa6 Rc7 34. Ba3 Rb6 35. Qa5 Qe5 36. Bc5 Rbb7 37. Qa3 g4 38. Bb4 Rxb4 39. Qxb4 Bf8 40. Qb8 c5 41. Rxc5 Rxc5 42. Qxe5 Rxc1+ 43. Kh2 Nb6 44. Bxd5 Rc5 45. e4 Nxd5 46. exd5 Bg7 47. Qb8+ Kh7 48. Qd6 Bxd4 49. Qxd7 1-0

[Event "CalChess Class-ch op"]
[Site "Berkeley"]
[Date "1977.??.??"]
[Round "1"]
[White "Chen, Mingson"]
[Black "Siff, Boris"]
[Result "0-1"]
[ECO "C48"]
[PlyCount "64"]
[EventDate "1977.09.??"]
[EventType "swiss"]
[EventRounds "6"]
[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. Nc3 Nf6 4. Bb5 Nd4 5. 0-0 Nxb5 6. Nxb5 c6 7. Nc3 d6 8. d4 Qc7 9. h3 h6 10. Be3 g5 11. Nh2 Rg8 12. Ng4 Bxg4 13. hxg4 0-0-0 14. Qf3 Be7 15. d5 c5 16. b4 Qd7 17. bxc5 dxc5 18. Qf5 Nxg4 19. Qxf7 Rgf8 20. Qh5 Rf6 21. d6 Bxd6 22. Nd5 Rf7 23. Rad1 Qe6 24. Qh3 Re8 25. Bc1 Nf6 26. Qxh6 Nxe4 27. Bxg5 Qxh6 28. Bxh6 Rh8 29. Bc1 Rfh7 30. g3 Rh2 31. Rde1 Nxf2 32. Rxf2 Rh1+ 0-1

[Event "CalChess Class-ch op"]
[Site "Berkeley"]
[Date "1977.??.??"]
[Round "5"]
[White "Christiansen, Larry Mark"]
[Black "Siff, Boris"]
[Result "1-0"]
[ECO "D40"]
[WhiteElo "2460"]
[PlyCount "49"]
[EventDate "1977.09.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 c5 3. Nc3 Nc6 4. e3 e6 5. d4 d5 6. a3 dxc4 7. Bxc4 a6 8. Bd3 b5 9. dxc5 Bxc5 10. b4 Bd6 11. Bb2 Ne5 12. Nxe5 Bxe5 13. Qe2 0-0 14. f4 Bc7 15. Rd1 Qe7 16. 0-0 Bb7 17. e4 e5 18. Nd5 Nxd5 19. exd5 Bxd5 20. fxe5 Bc4 21. Bxc4 bxc4 22. Qxc4 Bxe5 23. Bxe5 Qxe5 24. Rd7 Ra7 25. Qxf7+ 1-0

[Event "CalChess Class-ch op"]
[Site "Berkeley"]
[Date "1977.??.??"]
[Round "3"]
[White "Dorsch, Thomas"]
[Black "Siff, Boris"]
[Result "1/2-1/2"]
[ECO "C44"]
[PlyCount "56"]
[EventDate "1977.09.??"]
[EventType "swiss"]
[EventRounds "6"]
[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. d4 exd4 4. c3 dxc3 5. Nxc3 Bb4 6. Bc4 d6 7. 0-0 Bxc3 8. bxc3 Be6 9. Bxe6 fxe6 10. Qb3 Qd7 11. Qxb7 Rb8 12. Qa6 Nge7 13. Qc4 0-0 14. Ng5 Rf6 15. f4 h6 16. Nf3 Rbf8 17. Be3 Kh8 18. g4 Rxf4 19. Bxf4 Rxf4 20. Kh1 Rxg4 21. Qb5 e5 22. Nd2 Qe8 23. Rf3 Qh5 24. Raf1 Qg5 25. Qe2 Ng6 26. Rf5 Qh4 27. Nf3 Qh3 28. Ng1 Qh4 1/2-1/2

[Event "CalChess Class-ch op"]
[Site "Berkeley"]
[Date "1977.??.??"]
[Round "2"]
[White "Siff, Boris"]
[Black "Mar, Craig"]
[Result "1-0"]
[ECO "E24"]
[PlyCount "85"]
[EventDate "1977.09.??"]
[EventType "swiss"]
[EventRounds "6"]
[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 Bb4 4. a3 Bxc3+ 5. bxc3 Ne4 6. Qc2 f5 7. f3 Ng5 8. e3 b6 9. Bd3 0-0 10. Ne2 Ba6 11. 0-0 Nc6 12. Ng3 g6 13. f4 Ne4 14. Nxe4 fxe4 15. Bxe4 Bxc4 16. Rf3 Qf6 17. Bxc6 dxc6 18. e4 Rad8 19. Be3 a5 20. Rd1 Qe7 21. Qc1 Be2 22. Rdf1 Bxf3 23. Rxf3 b5 24. Rg3 Rd7 25. Rg5 Rfd8 26. Kf2 Ra8 27. Rc5 b4 28. cxb4 axb4 29. axb4 Ra2+ 30. Kg3 Rd8 31. Qc4 Ra3 32. Kf3 Rb8 33. g3 Rb6 34. Ke2 Ra4 35. Bd2 Qd7 36. Re5 c5 37. Rxc5 Ra7 38. Bc3 Kf8 39. d5 exd5 40. Rxd5 Rd6 41. Rxd6 cxd6 42. Qd4 Qb5+ 43. Ke3 1-0

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1977.??.??"]
[Round "1"]
[White "Siff, Boris"]
[Black "Peters, Jack"]
[Result "0-1"]
[ECO "E24"]
[BlackElo "2370"]
[PlyCount "48"]
[EventDate "1977.??.??"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. e3 Nc6 7. Nf3 d6 8. Be2 e5 9. Qc2 0-0 10. 0-0 Re8 11. Re1 Bg4 12. Bb2 Qd7 13. Rad1 e4 14. Nd2 Bxe2 15. Rxe2 Qg4 16. f3 exf3 17. Nxf3 Na5 18. Rde1 Ne4 19. Qa4 b6 20. d5 Re7 21. Rc2 Nf6 22. Nd2 Nxd5 23. h3 Qh4 24. Nf3 Qxc4 0-1

[Event "CalChess Class-ch op"]
[Site "Berkeley"]
[Date "1977.??.??"]
[Round "6"]
[White "Siff, Boris"]
[Black "Sanchez, Gabriel"]
[Result "1/2-1/2"]
[ECO "B33"]
[PlyCount "120"]
[EventDate "1977.09.??"]
[EventType "swiss"]
[EventRounds "6"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e5 6. Ndb5 d6 7. Bg5 a6 8. Na3 b5 9. Nd5 Be7 10. Bxf6 Bxf6 11. c3 0-0 12. Be2 Rb8 13. Nc2 Bg5 14. Bg4 Be6 15. Nce3 g6 16. Qf3 h5 17. Bh3 b4 18. 0-0 Kg7 19. Qe2 Qc8 20. Bxe6 fxe6 21. Nxb4 Nxb4 22. cxb4 Rxb4 23. Rfd1 Qb8 24. Nc4 Rd8 25. b3 d5 26. exd5 exd5 27. Qxe5+ Bf6 28. Qxb8 Rbxb8 29. Na5 Bxa1 30. Rxa1 Rd6 31. a4 Kf6 32. Kf1 Rb4 33. Rd1 Ke7 34. Ke2 Kd7 35. Kd3 Kc7 36. Kc3 Rf4 37. f3 g5 38. h3 Rd7 39. b4 Kd6 40. Kb3 Re7 41. Rd3 h4 42. Kc3 Re2 43. Nb7+ Ke5 44. Nc5 a5 45. Na6 axb4+ 46. Nxb4 Rc4+ 47. Kb3 Rc5 48. a5 Kd6 49. a6 Ra5 50. Rd1 Re3+ 51. Kc2 Rea3 52. Rd4 Ke6 53. f4 Rg3 54. fxg5 Rxg2+ 55. Kb1 Ra3 56. Rxh4 Rxg5 57. Kb2 Rgg3 58. Rh6+ Ke5 59. Nc6+ Kf4 60. a7 Rgb3+ 1/2-1/2

[Event "Saratoga Paul Masson"]
[Site "Saratoga"]
[Date "1977.??.??"]
[Round "2"]
[White "Winslow, Elliott C"]
[Black "Siff, Boris"]
[Result "1-0"]
[ECO "C71"]
[PlyCount "87"]
[EventDate "1977.??.??"]
[EventType "swiss"]
[EventRounds "4"]
[EventCountry "USA"]
[SourceTitle "EXT 1999"]
[Source "ChessBase"]
[SourceDate "1998.11.16"]
[SourceVersion "1"]
[SourceVersionDate "1998.11.16"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. d4 Bd7 6. d5 Nb8 7. c4 g6 8. Nc3 Bg7 9. 0-0 Ne7 10. b4 a5 11. a3 Na6 12. Rb1 0-0 13. Be3 axb4 14. axb4 f5 15. Bxd7 Qxd7 16. Ng5 f4 17. Bd2 c5 18. Na4 Nc8 19. bxc5 Nxc5 20. Nxc5 dxc5 21. f3 b6 22. Ne6 Re8 23. Ra1 Rb8 24. Qb3 Qd6 25. Rfb1 Re7 26. Be1 Bf6 27. Bf2 Reb7 28. Ra6 Qe7 29. Qa4 Nd6 30. g3 g5 31. g4 Kf7 32. Kg2 Kg6 33. Ra8 Kf7 34. Rxb8 Rxb8 35. Bxc5 Rc8 36. Bxd6 Qxd6 37. Qa7+ Qe7 38. Qa6 Rb8 39. c5 Qe8 40. Rxb6 Ra8 41. Qb7+ Kg6 42. h4 gxh4 43. g5 Qg8 44. gxf6 1-0

[Event "American op 10th"]
[Site "Santa Monica"]
[Date "1974.11.28"]
[Round "2"]
[White "Gabrielson, Roger"]
[Black "Siff, Boris"]
[Result "1/2-1/2"]
[ECO "A25"]
[PlyCount "51"]
[EventDate "1974.11.28"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. g3 e5 2. c4 Nf6 3. Bg2 Bc5 4. Nc3 Nc6 5. d3 0-0 6. Nf3 d6 7. Bg5 h6 8. Bxf6 Qxf6 9. 0-0 Qd8 10. a3 a5 11. Qd2 Be6 12. e3 Bb6 13. b3 Ne7 14. d4 exd4 15. Nxd4 Bxd4 16. Qxd4 Nc6 17. Qd2 a4 18. Nxa4 Bxc4 19. bxc4 Rxa4 20. c5 dxc5 21. Qc2 Ra5 22. Bxc6 bxc6 23. Rfd1 Qf6 24. a4 g6 25. Qc4 Rfa8 26. Kg2 1/2-1/2

[Event "American op 10th"]
[Site "Santa Monica"]
[Date "1974.11.28"]
[Round "1"]
[White "Siff, Boris"]
[Black "Cotton, Donald R"]
[Result "1-0"]
[ECO "C14"]
[PlyCount "80"]
[EventDate "1974.11.28"]
[EventType "swiss"]
[EventRounds "8"]
[EventCountry "USA"]
[SourceTitle "EXT 2008"]
[Source "ChessBase"]
[SourceDate "2007.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2007.11.25"]
[SourceQuality "1"]

1. d4 e6 2. Nc3 d5 3. e4 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. h4 c5 7. Bxe7 Kxe7 8. Qh5 Kf8 9. 0-0-0 cxd4 10. Nb5 Nc6 11. f4 f6 12. Nxd4 Nxd4 13. Rxd4 Qa5 14. Nf3 Qxa2 15. f5 Nxe5 16. Nxe5 fxe5 17. fxe6 Bxe6 18. Qxe5 Re8 19. Bc4 Qa1+ 20. Kd2 Qxh1 21. Rf4+ Bf7 22. Rxf7+ Kxf7 23. Bxd5+ Kf8 24. Qf4+ Ke7 25. Qc7+ Kf6 26. Qd6+ Kf5 27. Qd7+ Kf4 28. g3+ Kxg3 29. Qxg7+ Kh2 30. Qc7+ Kh3 31. Bxh1 Rd8+ 32. Ke3 Rd1 33. Qxb7 Re8+ 34. Be4 Re1+ 35. Kd3 R8xe4 36. Qxe4 Rxe4 37. Kxe4 Kxh4 38. Kf4 h5 39. c4 Kh3 40. c5 h4 1-0

