![](https://www.hugochess.com/assets/img/canada.png)
[Event "Winter Knights II"]
[Site "Montreal CAN"]
[Date "1987.??.??"]
[Round "4"]
[White "Zaldivar, Rigoberto"]
[Black "Patterson, Roger"]
[Result "1-0"]
[PlyCount "191"]
1.d4 d5 2.e3 Nf6 3.Bd3 Bg4 4.Nf3 e6 5.Nbd2 c5 6.c3 Nc6 7.O-O Be7 8.Re1 O-O 9.Nf1 e5 10.dxe5 Nxe5 11.Be2 Nc6 12.Ng3 Ne4 13.Qc2 Nxg3 14.hxg3 Qd7 15.Bd2 Rfd8 16.Rad1 Rac8 17.Bc1 Bf5 18.Qa4 Nd4 19.Qxd7 Nxe2+ 20.Rxe2 Rxd7 21.Red2 Rcd8 22.Kf1 Bf6 23.Ng1 Bb1 24.a3 Ba2 25.Nf3 g6 26.Re1 Re7 27.Kg1 Bb3 28.Kh2 Rde8 29.g4 Re4 30.Kg3 d4 31.cxd4 cxd4 32.Rd3 Bc4 33.Rdd1 Bb3 34.Rd3 Bc4 35.Rdd1 dxe3 36.Rxe3 Rxe3 37.fxe3 Rd8 38.Rxd8+ Bxd8 39.e4 Bd3 40.Be3 a6 41.e5 Bc7 42.g5 Kf8 43.Kf4 Bf1 44.g3 Ke8 45.Bc5 Kd7 46.Nd4 Bg2 47.Bf8 Bb6 48.Ke3 Bd8 49.Kf4 Ba5 50.b4 Bb6 51.Ke3 Bd5 52.Bg7 Bd8 53.Bf6 Bxf6 54.gxf6 g5 55.g4 h6 56.Kf2 Be4 57.Ke3 Bg6 58.Kf3 h5 59.gxh5 Bxh5+ 60.Ke4 Bg4 61.Nb3 b6 62.Nd4 Kd8 63.a4 a5 64.bxa5 bxa5 65.Nc6+ Ke8 66.Nxa5 Bd7 67.Nc4 Bxa4 68.Nd6+ Kf8 69.Kf5 Bc2+ 70.Kxg5 Bd3 71.Nf5 Bc4 72.Ng7 Ba2 73.Kf5 Bb1+ 74.Kf4 Ba2 75.Ke4 Bb3 76.Kd4 Ba2 77.Kc5 Bb3 78.Kd6 Ba2 79.Kd7 Bb3 80.Kd8 Ba2 81.Nf5 Bb3 82.Nd4 Bc4 83.Nc6 Ba2 84.Nb8 Bb1 85.Nd7+ Kg8 86.Ke7 Bg6 87.Ke8 Bh5 88.Nb6 Kh7 89.Nc4 Kg8 90.Nd6 Bg6 91.Nc8 Bh5 92.Ne7+ Kh7 93.Kf8 Kh6 94.Nf5+ Kg5 95.Nd6 Kf4 96.Nxf7 1-0
[Site "Montreal CAN"]
[Date "1987.??.??"]
[Round "4"]
[White "Zaldivar, Rigoberto"]
[Black "Patterson, Roger"]
[Result "1-0"]
[PlyCount "191"]
1.d4 d5 2.e3 Nf6 3.Bd3 Bg4 4.Nf3 e6 5.Nbd2 c5 6.c3 Nc6 7.O-O Be7 8.Re1 O-O 9.Nf1 e5 10.dxe5 Nxe5 11.Be2 Nc6 12.Ng3 Ne4 13.Qc2 Nxg3 14.hxg3 Qd7 15.Bd2 Rfd8 16.Rad1 Rac8 17.Bc1 Bf5 18.Qa4 Nd4 19.Qxd7 Nxe2+ 20.Rxe2 Rxd7 21.Red2 Rcd8 22.Kf1 Bf6 23.Ng1 Bb1 24.a3 Ba2 25.Nf3 g6 26.Re1 Re7 27.Kg1 Bb3 28.Kh2 Rde8 29.g4 Re4 30.Kg3 d4 31.cxd4 cxd4 32.Rd3 Bc4 33.Rdd1 Bb3 34.Rd3 Bc4 35.Rdd1 dxe3 36.Rxe3 Rxe3 37.fxe3 Rd8 38.Rxd8+ Bxd8 39.e4 Bd3 40.Be3 a6 41.e5 Bc7 42.g5 Kf8 43.Kf4 Bf1 44.g3 Ke8 45.Bc5 Kd7 46.Nd4 Bg2 47.Bf8 Bb6 48.Ke3 Bd8 49.Kf4 Ba5 50.b4 Bb6 51.Ke3 Bd5 52.Bg7 Bd8 53.Bf6 Bxf6 54.gxf6 g5 55.g4 h6 56.Kf2 Be4 57.Ke3 Bg6 58.Kf3 h5 59.gxh5 Bxh5+ 60.Ke4 Bg4 61.Nb3 b6 62.Nd4 Kd8 63.a4 a5 64.bxa5 bxa5 65.Nc6+ Ke8 66.Nxa5 Bd7 67.Nc4 Bxa4 68.Nd6+ Kf8 69.Kf5 Bc2+ 70.Kxg5 Bd3 71.Nf5 Bc4 72.Ng7 Ba2 73.Kf5 Bb1+ 74.Kf4 Ba2 75.Ke4 Bb3 76.Kd4 Ba2 77.Kc5 Bb3 78.Kd6 Ba2 79.Kd7 Bb3 80.Kd8 Ba2 81.Nf5 Bb3 82.Nd4 Bc4 83.Nc6 Ba2 84.Nb8 Bb1 85.Nd7+ Kg8 86.Ke7 Bg6 87.Ke8 Bh5 88.Nb6 Kh7 89.Nc4 Kg8 90.Nd6 Bg6 91.Nc8 Bh5 92.Ne7+ Kh7 93.Kf8 Kh6 94.Nf5+ Kg5 95.Nd6 Kf4 96.Nxf7 1-0
[Event "Winter Knights II"]
[Site "Montreal CAN"]
[Date "1987.??.??"]
[Round "4"]
[White "Zaldivar, Rigoberto"]
[Black "Patterson, Roger"]
[Result "1-0"]
[ECO "D05"]
[EventDate "1987.??.??"]
[PlyCount "191"]
[EventType "tourn"]
[EventCountry "CAN"]
1. d4 d5 2. e3 Nf6 3. Bd3 Bg4 4. Nf3 e6 5. Nbd2 c5 6. c3 Nc6 7. O-O Be7 8.
Re1 O-O 9. Nf1 e5 10. dxe5 Nxe5 11. Be2 Nc6 12. Ng3 Ne4 13. Qc2 Nxg3 14.
hxg3 Qd7 15. Bd2 Rfd8 16. Rad1 Rac8 17. Bc1 Bf5 18. Qa4 Nd4 19. Qxd7 Nxe2+
20. Rxe2 Rxd7 21. Red2 Rcd8 22. Kf1 Bf6 23. Ng1 Bb1 24. a3 Ba2 25. Nf3 g6
26. Re1 Re7 27. Kg1 Bb3 28. Kh2 Rde8 29. g4 Re4 30. Kg3 d4 31. cxd4 cxd4
32. Rd3 Bc4 33. Rdd1 Bb3 34. Rd3 Bc4 35. Rdd1 dxe3 36. Rxe3 Rxe3 37. fxe3
Rd8 38. Rxd8+ Bxd8 39. e4 Bd3 40. Be3 a6 41. e5 Bc7 42. g5 Kf8 43. Kf4 Bf1
44. g3 Ke8 45. Bc5 Kd7 46. Nd4 Bg2 47. Bf8 Bb6 48. Ke3 Bd8 49. Kf4 Ba5 50.
b4 Bb6 51. Ke3 Bd5 52. Bg7 Bd8 53. Bf6 Bxf6 54. gxf6 g5 55. g4 h6 56. Kf2
Be4 57. Ke3 Bg6 58. Kf3 h5 59. gxh5 Bxh5+ 60. Ke4 Bg4 61. Nb3 b6 62. Nd4
Kd8 63. a4 a5 64. bxa5 bxa5 65. Nc6+ Ke8 66. Nxa5 Bd7 67. Nc4 Bxa4 68. Nd6+
Kf8 69. Kf5 Bc2+ 70. Kxg5 Bd3 71. Nf5 Bc4 72. Ng7 Ba2 73. Kf5 Bb1+ 74. Kf4
Ba2 75. Ke4 Bb3 76. Kd4 Ba2 77. Kc5 Bb3 78. Kd6 Ba2 79. Kd7 Bb3 80. Kd8 Ba2
81. Nf5 Bb3 82. Nd4 Bc4 83. Nc6 Ba2 84. Nb8 Bb1 85. Nd7+ Kg8 86. Ke7 Bg6
87. Ke8 Bh5 88. Nb6 Kh7 89. Nc4 Kg8 90. Nd6 Bg6 91. Nc8 Bh5 92. Ne7+ Kh7
93. Kf8 Kh6 94. Nf5+ Kg5 95. Nd6 Kf4 96. Nxf7 1-0