[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.04.07"]
[Round "15"]
[White "Ong, Yok Hwa"]
[Black "Pachman, Ludek"]
[Result "0-1"]
[ECO "E51"]
[PlyCount "78"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Nc3 Bb4 5. e3 0-0 6. Bd3 Nc6 7. 0-0 dxc4 8. Bxc4 Bd6 9. e4 e5 10. d5 Ne7 11. Bg5 Ng6 12. h3 h6 13. Be3 a6 14. a3 Nh7 15. Bd3 Qf6 16. Re1 Nf4 17. Bf1 g5 18. Nh2 Qg6 19. g4 Kg7 20. Qf3 Nf6 21. Bxf4 gxf4 22. Qg2 Nh7 23. Nf3 Qf6 24. Bd3 Rg8 25. Kf1 Kf8 26. Ke2 Ke7 27. Nd2 h5 28. f3 Qh4 29. b4 Ng5 30. Rh1 a5 31. b5 Qg3 32. Kf1 f6 33. Ne2 Qh4 34. Qf2 Qxf2+ 35. Kxf2 Bd7 36. a4 Rh8 37. Nb3 Rag8 38. Bc4 Rg7 39. Raf1 Rgh7 0-1

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.04.05"]
[Round "14"]
[White "Tal, Mihail"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "B96"]
[PlyCount "33"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Nbd7 8. Qf3 Qc7 9. 0-0-0 b5 10. e5 Bb7 11. Qh3 dxe5 12. Nxe6 fxe6 13. Qxe6+ Be7 14. Bxf6 Nxf6 15. Bxb5+ Kf8 16. fxe5 Ba3 17. exf6 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.04.04"]
[Round "13"]
[White "Ong, Yok Hwa"]
[Black "Minev, Nikolay Nikolaev"]
[Result "1/2-1/2"]
[ECO "C71"]
[PlyCount "75"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. d4 b5 6. Bb3 Nxd4 7. Nxd4 exd4 8. Bd5 Rb8 9. Qxd4 Bd7 10. c3 Nf6 11. Bg5 Be7 12. Bb3 0-0 13. f3 c5 14. Qd1 c4 15. Bc2 Qb6 16. Qd2 Bc6 17. Be3 Qb7 18. 0-0 Nd7 19. Qf2 d5 20. Nd2 Rbd8 21. Bd4 Qc7 22. Rfe1 dxe4 23. Nxe4 Bxe4 24. Rxe4 Bc5 25. Rh4 h6 26. Rd1 Bxd4 27. Rhxd4 Nf6 28. Qg3 Qb6 29. Qf2 Qc7 30. a3 Rfe8 31. Rxd8 Rxd8 32. Rd4 Rxd4 33. Qxd4 Qe7 34. Qf2 Qc7 35. g3 Kf8 36. Bf5 Ke7 37. Qe3+ Kf8 38. Qd4 1/2-1/2

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.04.03"]
[Round "12"]
[White "Damjanovic, Mato"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "B90"]
[PlyCount "87"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. h3 e5 7. Nde2 Be6 8. g4 d5 9. exd5 Nxd5 10. Bg2 Nxc3 11. Qxd8+ Kxd8 12. Nxc3 Nc6 13. Be3 Kc7 14. 0-0-0 Be7 15. Bd5 Rad8 16. Bxe6 fxe6 17. Ne4 Rxd1+ 18. Rxd1 Rf8 19. c3 b6 20. b4 Rf3 21. Rh1 Bh4 22. Kd2 h6 23. Ke2 Rf8 24. a4 Be7 25. Rb1 Nb8 26. b5 a5 27. Rd1 Nd7 28. Rxd7+ Kxd7 29. Bxb6 Rb8 30. Be3 Rc8 31. Kd3 Kc7 32. c4 Rd8+ 33. Ke2 Bb4 34. g5 hxg5 35. Nxg5 Kd7 36. Nf7 Rc8 37. Nxe5+ Kd6 38. f4 Bc3 39. c5+ Kd5 40. Nd7 Rc7 41. c6 Bb4 42. Kd3 Kd6 43. Bd4 Ke7 44. Bxg7 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.04.01"]
[Round "11"]
[White "Ong, Yok Hwa"]
[Black "Kotov, Alexander"]
[Result "0-1"]
[ECO "B38"]
[PlyCount "120"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. c4 c5 4. Nf3 cxd4 5. Nxd4 Nc6 6. Be3 d6 7. Nc3 Nf6 8. Be2 0-0 9. 0-0 Bd7 10. h3 Nxd4 11. Bxd4 Bc6 12. Qd3 a6 13. f4 e6 14. Rad1 Qe7 15. Bf3 e5 16. Be3 Rfe8 17. fxe5 dxe5 18. Bg5 h6 19. Be3 Rad8 20. Qe2 b5 21. Nd5 Qb7 22. b3 Nh7 23. Qd2 h5 24. Kh2 bxc4 25. bxc4 Rb8 26. Qf2 Bf8 27. Qg3 Bg7 28. Rd2 Re6 29. Bd1 a5 30. Rdf2 Be8 31. Be2 Qc8 32. c5 Qd7 33. Bc4 Qa4 34. Bd3 Qa3 35. Bc4 Rb7 36. Nb6 Rf6 37. Rxf6 Nxf6 38. Rxf6 h4 39. Qg5 Bxf6 40. Qxg6+ Bg7 41. Qg5 Kf8 42. Bd5 f6 43. Bc1 Qxc5 44. Qe3 Qxe3 45. Bxe3 Rc7 46. Bd2 Rc2 47. Be1 Bh6 48. Bxh4 Bf4+ 49. Bg3 Bf7 50. a4 Be3 51. Bxf7 Kxf7 52. Nd5 Bd2 53. Nb6 Ra2 54. h4 Be3 55. Nc4 Bd4 56. Nxa5 Rxa4 57. Nb7 Kg6 58. Be1 Ra1 59. Ba5 Kh5 60. Bd8 Kg6 0-1

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.31"]
[Round "10"]
[White "Gasic, Bozidar"]
[Black "Ong, Yok Hwa"]
[Result "0-1"]
[ECO "B09"]
[PlyCount "96"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. f4 Nf6 5. Nf3 0-0 6. e5 Nfd7 7. h4 c5 8. h5 cxd4 9. hxg6 hxg6 10. Qxd4 Nc6 11. Qf2 e6 12. Ng5 dxe5 13. Qh4 Re8 14. Bd2 Nf8 15. 0-0-0 Bd7 16. Bd3 Rc8 17. Rh2 Nb4 18. fxe5 Nxd3+ 19. cxd3 Bxe5 20. Rdh1 Bb5 21. Qe4 Qd5 22. Nxf7 Qxe4 23. Nh6+ Kg7 24. dxe4 Bxh2 25. Rxh2 Nd7 26. Ng4 Be2 27. Bh6+ Kf7 28. Ne3 Nf6 29. Kd2 Ba6 30. g4 Kg8 31. e5 Nd7 32. Bf4 Rf8 33. Bg3 Nc5 34. Bh4 Rf7 35. b4 Rd7+ 36. Ned5 exd5 37. bxc5 Rh7 38. e6 g5 39. Bg3 Rxh2+ 40. Bxh2 Rxc5 41. Bb8 Bc4 42. Bxa7 Rc6 43. e7 Kf7 44. Be3 Kxe7 45. Bxg5+ Ke6 46. Be3 Ke5 47. Bf2 Rg6 48. Bg3+ Ke6 0-1

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.30"]
[Round "9"]
[White "Honfi, Karoly"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "B88"]
[PlyCount "65"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 Be7 8. f4 Qc7 9. Qf3 Nc6 10. Be3 Bd7 11. 0-0-0 Rc8 12. f5 Nxd4 13. Bxd4 e5 14. Be3 b5 15. Bg5 Bc6 16. h4 a5 17. Bxf6 Bxf6 18. Qd3 b4 19. Nb5 Bxb5 20. Qxb5+ Kf8 21. Rd5 Bd8 22. Rhd1 Qc6 23. Qxc6 Rxc6 24. Rxe5 Bc7 25. Ba4 Rxc2+ 26. Kxc2 dxe5 27. Rd7 Bb6 28. g4 f6 29. h5 Rg8 30. Bb3 Rh8 31. Kd3 Ke8 32. Ba4 Kf8 33. Kc4 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.28"]
[Round "8"]
[White "Ong, Yok Hwa"]
[Black "Ciric, Dragoljub M"]
[Result "0-1"]
[ECO "D44"]
[PlyCount "44"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 Nf6 5. Bg5 dxc4 6. Ne5 b5 7. a4 Bb4 8. f3 h6 9. Bxf6 gxf6 10. Ng4 f5 11. Ne5 Bb7 12. e3 Rg8 13. f4 Nd7 14. Nxd7 Qxd7 15. Kf2 a6 16. Rg1 Rd8 17. Qh5 c5 18. Rd1 Qc7 19. dxc5 Bxc5 20. Rxd8+ Qxd8 21. Nd1 Rg4 22. Be2 Rh4 0-1

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.27"]
[Round "7"]
[White "Ivkov, Borislav"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "E96"]
[PlyCount "65"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 0-0 6. Be2 Nbd7 7. 0-0 c6 8. Re1 e5 9. Bf1 Re8 10. Rb1 exd4 11. Nxd4 Nc5 12. f3 a5 13. Be3 Qc7 14. b3 Nfd7 15. Qd2 Ne5 16. Rbd1 Be6 17. h3 Bc8 18. Bf2 b6 19. a3 Bb7 20. Qc2 Ne6 21. b4 axb4 22. axb4 Ra7 23. Qd2 Bf8 24. f4 Nd7 25. e5 Bc8 26. exd6 Qxd6 27. f5 Nc7 28. Rxe8 Nxe8 29. Qe1 Qe5 30. Nxc6 Qxe1 31. Rxe1 Rc7 32. Rxe8 Rxc6 33. b5 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.26"]
[Round "6"]
[White "Ong, Yok Hwa"]
[Black "Bogdanovic, Rajko"]
[Result "0-1"]
[ECO "B92"]
[PlyCount "180"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. 0-0 0-0 9. Be3 Qc7 10. h3 b5 11. a3 Bb7 12. Bf3 Nbd7 13. Qe2 Rac8 14. Rfd1 Nb6 15. Bxb6 Qxb6 16. Nd2 Bc6 17. Nf1 Qb7 18. Ng3 g6 19. Qe3 Rfe8 20. Rd2 Nd7 21. Bg4 Qc7 22. Kh2 Rcd8 23. Bxd7 Rxd7 24. Qe2 Rc8 25. Nf1 f5 26. Ne3 Bg5 27. Ned5 Qb7 28. Rd3 a5 29. exf5 gxf5 30. Qh5 Rg7 31. Rg3 Be8 32. Qf3 Qf7 33. Kg1 Bc6 34. Qd1 Bh4 35. Rxg7+ Qxg7 36. Qh5 Qg5 37. Qxg5+ Bxg5 38. Rd1 Kf7 39. Nb6 Rb8 40. Nbd5 b4 41. axb4 axb4 42. Ne2 Ke6 43. Nc7+ Kd7 44. Na6 Rb6 45. Nc5+ Ke7 46. Nd3 Bf6 47. b3 f4 48. f3 Ke6 49. Re1 Kf5 50. Ra1 Bd8 51. Kf1 Rb5 52. Ke1 Bb6 53. Ra4 Ke6 54. Kd1 Ra5 55. Rxa5 Bxa5 56. Kd2 Bb7 57. Ke1 Kf5 58. Kf1 h5 59. Ke1 Kg5 60. Kf1 Kf5 61. Ke1 d5 62. Kf1 h4 63. Kf2 Bc6 64. Kf1 Be8 65. Kf2 Bf7 66. Kf1 Bh5 67. Kf2 Bg6 68. Kf1 Bf7 69. Kg1 e4 70. Nd4+ Kf6 71. Nf2 Bb6 72. Ne2 Kf5 73. Kf1 Bg6 74. Ng4 exf3 75. gxf3 Kg5 76. c3 Bc7 77. cxb4 Bb6 78. Ne5 Bc2 79. Nd7 Be3 80. Nc5 Kf6 81. Nc3 Ke5 82. Ke2 Bxc5 83. bxc5 Bf5 84. Nb5 Bxh3 85. c6 Bf5 86. c7 h3 87. Kf2 d4 88. Na7 d3 89. Nc6+ Kd6 90. Nd4 Kxc7 0-1

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.24"]
[Round "5"]
[White "Matulovic, Milan"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "B06"]
[PlyCount "73"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 g6 2. d4 Bg7 3. Nc3 d6 4. Nge2 Nc6 5. d5 Nb8 6. Ng3 Nf6 7. Be2 c6 8. 0-0 0-0 9. Be3 Nbd7 10. Qd2 Ne5 11. h3 a6 12. a4 cxd5 13. exd5 Qc7 14. b3 b6 15. a5 b5 16. Bb6 Qb8 17. f4 Ned7 18. Bd4 Bb7 19. Bf3 Qc7 20. Rfe1 Rfe8 21. Na2 Nc5 22. Nb4 Rac8 23. Re3 e6 24. dxe6 fxe6 25. Bxb7 Qxb7 26. Rae1 Kf7 27. Nd3 Nxd3 28. Rxd3 Rc6 29. Bxf6 Bxf6 30. Ne4 Qa7+ 31. Kh2 d5 32. Nxf6 Kxf6 33. Rxd5 Qc7 34. Qd4+ e5 35. fxe5+ Ke7 36. Rf1 g5 37. Rd7+ 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.23"]
[Round "4"]
[White "Ong, Yok Hwa"]
[Black "Janosevic, Dragoljub"]
[Result "1/2-1/2"]
[ECO "E88"]
[PlyCount "65"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 e5 7. d5 c6 8. Bd3 cxd5 9. cxd5 a6 10. Nge2 Nbd7 11. Rc1 Ne8 12. 0-0 b5 13. a3 f5 14. Na2 fxe4 15. fxe4 Nef6 16. h3 Nc5 17. Ng3 Nfd7 18. Rxf8+ Bxf8 19. b4 Nxd3 20. Qxd3 Nb6 21. Rf1 Nc4 22. Bc1 Bd7 23. Kh2 Bg7 24. Nc3 Qh4 25. Nd1 Bh6 26. Bxh6 Qxh6 27. a4 Rf8 28. Rxf8+ Kxf8 29. Ne2 Ke7 30. a5 Qh4 31. Ndc3 Qe1 32. Qg3 Qxg3+ 33. Kxg3 1/2-1/2

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.22"]
[Round "3"]
[White "Mestrovic, Zvonimir"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "C13"]
[PlyCount "81"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. Nc3 d5 3. Bg5 e6 4. e4 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 Nd7 8. Bc4 a6 9. 0-0 0-0 10. Re1 b5 11. Bb3 Bb7 12. c3 Bxe4 13. Rxe4 c5 14. Qe2 g6 15. Rd1 Qc7 16. h4 c4 17. Bc2 Bg7 18. h5 Nf6 19. hxg6 hxg6 20. Rh4 Nd5 21. Bb1 Bf6 22. Rg4 Kg7 23. Ne5 Rh8 24. g3 Rh6 25. Be4 Rd8 26. Bxd5 Rxd5 27. Re4 Rh8 28. Re1 Bxe5 29. Rxe5 Rxe5 30. Qxe5+ Qxe5 31. Rxe5 Rh5 32. Rxh5 gxh5 33. Kg2 Kf6 34. Kh3 Kg5 35. f3 a5 36. f4+ Kf5 37. Kh4 Ke4 38. Kxh5 Kd3 39. f5 exf5 40. d5 Kc2 41. d6 1-0

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.21"]
[Round "2"]
[White "Ong, Yok Hwa"]
[Black "Jansa, Vlastimil"]
[Result "1/2-1/2"]
[ECO "A39"]
[PlyCount "105"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. Nf3 cxd4 4. Nxd4 Nc6 5. Nc3 g6 6. g3 Bg7 7. Bg2 0-0 8. 0-0 Qa5 9. Ncb5 a6 10. Nb3 Qa4 11. Na3 d6 12. Bg5 Be6 13. Nd2 Qa5 14. Nf3 Ne4 15. Bc1 Rfd8 16. e3 f5 17. Nd4 Bf7 18. f3 Nc5 19. Bd2 Qb6 20. Nxc6 bxc6 21. Rb1 a5 22. b3 e5 23. Kh1 d5 24. Qe2 d4 25. e4 Be6 26. Bg5 Rd7 27. Qd2 Rf8 28. Nc2 Rdf7 29. exf5 Bxf5 30. Rbe1 h6 31. Bxh6 Bxh6 32. Qxh6 Bxc2 33. Rxe5 Rh7 34. Qd2 Nd7 35. Rg5 Qd8 36. f4 d3 37. Rxg6+ Rg7 38. Rxc6 Nf6 39. Re1 Qd4 40. f5 Rh7 41. Bf3 Kh8 42. Ree6 Ng4 43. Bxg4 Qxg4 44. Qc3+ Rg7 45. Rh6+ Kg8 46. Rcg6 Qe4+ 47. Kg1 Qe3+ 48. Kg2 Qe4+ 49. Kg1 Rff7 50. Rd6 Qxf5 51. Rd8+ Rf8 52. Rxf8+ Qxf8 53. Qe5 1/2-1/2

[Event "Sarajevo-09"]
[Site "Sarajevo"]
[Date "1966.03.20"]
[Round "1"]
[White "Pietzsch, Wolfgang"]
[Black "Ong, Yok Hwa"]
[Result "1-0"]
[ECO "B75"]
[PlyCount "73"]
[EventDate "1966.03.20"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "YUG"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 g6 6. Be3 Bg7 7. f3 Nc6 8. Qd2 Bd7 9. Bc4 Nxd4 10. Bxd4 0-0 11. h4 Qa5 12. 0-0-0 b5 13. Bb3 Be6 14. Kb1 Bxb3 15. cxb3 b4 16. Bxf6 exf6 17. Nd5 Rfe8 18. h5 Rab8 19. hxg6 hxg6 20. Rc1 f5 21. exf5 Re5 22. Rhe1 gxf5 23. Nf4 Rc5 24. Nh5 Rxc1+ 25. Rxc1 Qd8 26. Nxg7 Kxg7 27. Qd4+ Qf6 28. Qxa7 Re8 29. Qf2 f4 30. a3 bxa3 31. bxa3 Re3 32. Qb2 Re5 33. Ka2 Qe7 34. g3 f6 35. gxf4 Re3 36. f5 d5 37. Qg2+ 1-0

[Event "Netherlands"]
[Site "Netherlands"]
[Date "1966.??.??"]
[Round "?"]
[White "Bobotsov, Milko Georgiev"]
[Black "Ong, Yok Hwa"]
[Result "0-1"]
[ECO "E89"]
[PlyCount "106"]
[EventDate "1966.??.??"]
[EventType "game"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 0-0 6. Be3 e5 7. d5 c6 8. Nge2 cxd5 9. cxd5 Nbd7 10. g4 h5 11. h3 Nb6 12. Bg5 Qe8 13. Bh4 Bd7 14. b3 Rc8 15. Qd2 Na8 16. Rc1 Nc7 17. Bf2 b6 18. Ng3 h4 19. Nge2 Nh7 20. Bxh4 f5 21. Bg2 f4 22. Bf2 Kf7 23. h4 Kg8 24. g5 Rf7 25. Rc2 Na6 26. 0-0 Qe7 27. Rfc1 Nb4 28. Rb2 Bf8 29. a3 Na6 30. Kf1 Qd8 31. b4 Nc7 32. Rbc2 Ne8 33. Ke1 Nxg5 34. hxg5 Qxg5 35. Bf1 Rh7 36. Ng1 Rh1 37. Nce2 Rxc2 38. Rxc2 Be7 39. Rc3 Rh2 40. Nc1 Qh5 41. Nce2 Bh4 42. Bxh4 Qxh4+ 43. Kd1 Qf2 44. Qe1 Ba4+ 45. Kd2 Qxg1 46. Kc1 Qf2 47. Kd2 Qg3 48. Qxg3 fxg3 49. Ke3 g2 50. Bxg2 Rxg2 51. Rc8 Bb5 52. Nc3 Rc2 53. a4 Bd7 0-1

