[Event "USA-ch"]
[Site "New York"]
[Date "1969.??.??"]
[Round "9"]
[White "Byrne, Robert Eugene"]
[Black "Byrne, Donald"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Bg7 5. c4 Nc6 6. Be3 d6 7. Be2 Nh6 8. Nc3 O-O 9. O-O f5 10. exf5 gxf5 11. f4 Bd7 12. Qd2 Ng4 13. Bxg4 fxg4 14. Rad1 Nxd4 15. Bxd4 Bxd4+ 16. Qxd4 Bc6 17. Nd5 Rf7 18. Ne3 h5 19. c5 Qc7 20. cxd6 Qxd6 21. Qc4 Qh6 22. Nd5 Re8 23. Rde1 Bxd5 24. Qxd5 e6 25. Qb5 Ref8 26. Re5 h4 27. Rg5+ Rg7 28. Rxg7+ Qxg7 29. Qc4 Qf7 30. Re1 Qxf4 31. Qxe6+ Kg7 32. Qe7+ Rf7 33. Qxh4 Qd4+ 34. Kh1 Qc4 35. h3 Rf1+ 36. Rxf1 Qxf1+ 37. Kh2 gxh3 38. Qxh3 Qb1 39. Qd7+ Kg6 40. Qd6+ Kg5 41. Qd2+ Kg4 42. Qe2+ Kg5 43. Qe7+ Kg4 44. Qg7+ Kf4 45. a3 b6 46. g3+ Kf3 47. Qf6+ Kg4 48. Qh4+ Kf3 49. Qf4+ Ke2 50. Kg2 Qa2 51. Qe5+ Kd1 52. g4 Qc4 53. Kg3 b5 54. g5 Qd3+ 55. Kf4 a5 56. Qc3 Qd6+ 57. Kf5 b4 58. axb4 axb4 59. Qe5 Qd7+ 60. Ke4 Kc2 61. Qc5+ Kb1 62. Qf5 Qb7+ 63. Qd5 Qa7 64. Qf5 Qb7+ 65. Qd5 1/2-1/2