[Event "Cincinnati  op"]
[Site "Cincinnati"]
[Date "1964.07.12"]
[Round "4"]
[White "Darbes, Alex"]
[Black "Petrison, John"]
[Result "0-1"]
[ECO "B07"]
[PlyCount "108"]
[EventDate "1964.07.11"]
[EventCountry "USA"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 g6 3. e4 d6 4. Bg5 Bg7 5. Qd2 h6 6. Bf4 Nbd7 7. Nf3 Nh5 8. Be3 c6 9. g4 Nhf6 10. g5 hxg5 11. Bxg5 Qc7 12. Bf4 b5 13. Bd3 a6 14. 0-0-0 c5 15. dxc5 Qxc5 16. Be3 Qc7 17. Ng5 Qa5 18. a3 Ne5 19. f4 Nxd3+ 20. Qxd3 Bg4 21. Rdg1 0-0 22. Bd2 Qc7 23. h3 Bh5 24. Ne2 Qc4 25. Qxc4 bxc4 26. Ng3 Bh6 27. e5 Bxg5 28. Nxh5 Nxh5 29. Rxg5 dxe5 30. fxe5 e6 31. Rhg1 Kh7 32. R5g4 Rfc8 33. Rd4 Ra7 34. Ba5 Rb7 35. Rgg4 Rb5 36. Bc3 Rxe5 37. Rd7 Rf5 38. Rgd4 Nf4 39. Kd2 g5 40. Ra7 Nxh3 41. Rdd7 Kg6 42. Rxa6 Rf2+ 43. Kd1 Nf4 44. Bd4 Rf3 45. a4 g4 46. a5 g3 47. Raa7 Nd5 48. Ke2 Rf4 49. c3 g2 50. a6 Rxd4 51. Rxf7 Rg8 52. Kf2 Rd2+ 53. Kg1 Ne3 54. Rad7 Rc2 0-1

[Event "Cincinnati  op"]
[Site "Cincinnati"]
[Date "1964.07.12"]
[Round "5"]
[White "Groeneman, Sidney"]
[Black "Darbes, Alex"]
[Result "0-1"]
[ECO "C01"]
[PlyCount "106"]
[EventDate "1964.07.11"]
[EventCountry "USA"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 e6 2. e4 Ne7 3. c4 Ng6 4. Nc3 Be7 5. Nf3 0-0 6. Bd3 Nc6 7. Be3 b6 8. Qc2 Nb4 9. Qd2 Nxd3+ 10. Qxd3 f5 11. exf5 Rxf5 12. g4 Rxf3 13. Qe4 Rxe3+ 14. fxe3 Rb8 15. Qd3 Bh4+ 16. Kd2 Qg5 17. h3 Bb7 18. Ne4 Qa5+ 19. Kc2 d5 20. cxd5 Qxd5 21. Nd2 c5 22. e4 Qxd4 23. Qb3 Bxe4+ 24. Nxe4 Qxe4+ 25. Qd3 Qxd3+ 26. Kxd3 Rd8+ 27. Kc2 e5 28. Rhf1 Nf4 29. Rf3 Bf6 30. Re1 g5 31. Rd1 Rd4 32. Ra3 a5 33. Rb3 Nd5 34. Rxd4 exd4 35. Kd3 Kf7 36. Kc4 Ke6 37. Rf3 Nf4 38. Rb3 Bd8 39. Rf3 Bc7 40. a4 Ke5 41. Rg3 Ke6 42. Rf3 Be5 43. Rb3 Nd5 44. Rf3 Bf4 45. Rf2 Ne3+ 46. Kd3 Kd5 47. b3 Kc6 48. Rb2 b5 49. Rb1 Nd5 50. Re1 Nb4+ 51. Ke2 bxa4 52. bxa4 c4 53. Kd1 c3 0-1

[Event "Cincinnati  op"]
[Site "Cincinnati"]
[Date "1964.07.11"]
[Round "1"]
[White "Berry, George Wendel"]
[Black "Darbes, Alex"]
[Result "1-0"]
[ECO "C01"]
[PlyCount "91"]
[EventDate "1964.07.11"]
[EventCountry "USA"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 e6 2. d4 Ne7 3. c4 Ng6 4. Nc3 Be7 5. g3 c6 6. Bg2 Na6 7. Nge2 0-0 8. 0-0 Nc7 9. Nf4 Rb8 10. Nxg6 fxg6 11. Bf4 d6 12. Qe2 Bg5 13. Bxg5 Qxg5 14. f4 Qd8 15. Rad1 d5 16. Rd2 b5 17. cxd5 b4 18. d6 Qxd6 19. e5 Qd7 20. Ne4 Ba6 21. Nc5 Bxe2 22. Nxd7 Bxf1 23. Kxf1 Nd5 24. Ke2 Rb7 25. Nxf8 Kxf8 26. Be4 Ke7 27. h4 Kf7 28. Kf3 Rb6 29. g4 Ra6 30. Bb1 Ne7 31. Rh2 h5 32. Kg3 Ra5 33. b3 Rd5 34. Rd2 c5 35. Be4 Rxd4 36. Rxd4 cxd4 37. g5 Nc8 38. Kf3 Nb6 39. Ke2 a5 40. Kd3 a4 41. Kxd4 a3 42. Kc5 Nd7+ 43. Kxb4 Nb6 44. Kxa3 Nd5 45. Bxd5 exd5 46. Kb4 1-0

[Event "Cincinnati  op"]
[Site "Cincinnati"]
[Date "1964.07.11"]
[Round "3"]
[White "Somers, George"]
[Black "Darbes, Alex"]
[Result "0-1"]
[ECO "A46"]
[PlyCount "50"]
[EventDate "1964.07.11"]
[EventCountry "USA"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 h6 3. e3 b6 4. Bd3 Bb7 5. Nbd2 g5 6. 0-0 g4 7. Ne5 h5 8. e4 d6 9. Nec4 Bg7 10. Ne3 Nc6 11. c3 Bh6 12. f4 gxf3 13. Nxf3 Qd7 14. Nf5 Bxc1 15. Ng7+ Kf8 16. Qxc1 Kxg7 17. Nh4 Rag8 18. Nf5+ Kf8 19. d5 Ne5 20. Bc2 Qb5 21. Nh6 Rg6 22. Nf5 Rhg8 23. Ne3 Qe2 24. Rf2 Nf3+ 25. Rxf3 Rxg2+ 0-1

