[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "De Rooi, Paul"]
[Black "Kuijpers, Frans"]
[Result "1-0"]
[PlyCount "61"]

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Nf6 5. Qe2 Qb6 6. Na3 a6 7. Bc4 Bg7 8. O-O
O-O 9. Nc2 d6 10. d3 Na5 11. Ne3 Nxc4 12. Nxc4 Qc6 13. Bg5 b5 14. Ne3 Ra7 15.
Nd2 Ne8 16. f4 b4 17. Rac1 bxc3 18. bxc3 f5 19. Nd5 Nf6 20. c4 Qe8 21. Rb1 fxe4
22. dxe4 Nxd5 23. exd5 Qa4 24. Rb8 Bf5 25. Rxf8+ Bxf8 26. g4 Bc8 27. f5 Qc2 28.
f6 exf6 29. Qe8 Bd7 30. Qb8 Bxg4 31. Qxa7 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "Enevoldsen, Jens"]
[Black "Wade, Robert G"]
[Result "1/2-1/2"]
[PlyCount "89"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g3 e5 7. Nb3 Be7 8. Bg2
h5 9. h3 a5 10. a3 Be6 11. Nd5 a4 12. Nd2 Bxd5 13. exd5 Nd4 14. c3 Nf5 15. Nc4
Qc7 16. Qd3 g6 17. Ne3 Nxe3 18. Bxe3 Nd7 19. O-O-O Nc5 20. Qb5+ Qd7 21. Bf1 Ra5
22. Qb4 f5 23. Kb1 Bd8 24. f4 e4 25. Be2 Kf7 26. g4 Nd3 27. Bxd3 exd3 28. gxh5
Rxh5 29. Rxd3 Ra6 30. Bc1 Ba5 31. Qd4 Bb6 32. Qc4 Qe8 33. Ka2 Bc5 34. Rdd1 b5
35. Qd3 Ra7 36. Rde1 Re7 37. Rxe7+ Qxe7 38. Qxb5 Qe4 39. Qd7+ Kf6 40. Rd1 Rxh3
41. Qb5 Rh1 42. Rxh1 Qxh1 43. Qe8 Qxd5+ 44. Ka1 Qd1 45. Kb1 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "Johner, Hans"]
[Black "Crabbendam, H."]
[Result "1/2-1/2"]
[PlyCount "68"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 g6 6. Bd3 Bg7 7. Nf3 O-O 8. O-O a6
9. Ne1 Nbd7 10. Be3 Rb8 11. a4 Ne8 12. Qd2 Nc7 13. f4 exf4 14. Bxf4 Ne5 15. Nf3
Bd7 16. Nxe5 Bxe5 17. Bxe5 dxe5 18. Qh6 Qe7 19. Rf3 b5 20. axb5 axb5 21. Raf1
b4 22. Ne2 Bg4 23. Rg3 Bxe2 24. d6 Qxd6 25. Rh3 Qd4+ 26. Kh1 Bh5 27. Rxh5 gxh5
28. Qg5+ Kh8 29. Qf6+ Kg8 30. Rf3 h4 31. Qg5+ Kh8 32. Qf6+ Kg8 33. Qg5+ Kh8 34.
Qf6+ Kg8 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "Langeweg, Kick"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "77"]

1. c4 Nf6 2. Nc3 c5 3. g3 g6 4. Bg2 Bg7 5. Nf3 O-O 6. d4 cxd4 7. Nxd4 Nc6 8.
Nc2 d6 9. O-O Bd7 10. b3 Qc8 11. Bb2 Bh3 12. Rb1 Bxg2 13. Kxg2 Qf5 14. f3 h5
15. Qd2 Rac8 16. e4 Qa5 17. Rf2 Kh7 18. Ne3 Bh6 19. Qe1 Ne5 20. Qe2 a6 21. Ned5
Nxd5 22. Nxd5 Qxa2 23. Qd1 Qa5 24. Nxe7 Rce8 25. Nd5 f5 26. exf5 Rxf5 27. f4
Ng4 28. Re2 Qd8 29. Kg1 Bg7 30. Bxg7 Kxg7 31. Qd4+ Kf7 32. Rbe1 Rxe2 33. Rxe2
Nf6 34. Re7+ Kf8 35. Rxb7 Qe8 36. Ne7 d5 37. Qa7 dxc4 38. Rb8 Qxb8 39. Nxg6+
1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "Van den Berg, Carel"]
[Black "Donner, Jan-Hein"]
[Result "1/2-1/2"]
[PlyCount "51"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 g6 6. O-O Bg7 7. Be3 Ne7 8. f4
Nbc6 9. Nxc6 bxc6 10. Nd2 O-O 11. c3 d6 12. Qc2 Qc7 13. Rad1 c5 14. b4 cxb4 15.
cxb4 Nc6 16. a3 Bb7 17. Nb3 Rfc8 18. Qf2 Qe7 19. Bb1 Rd8 20. Rd2 Rac8 21. Rfd1
Nb8 22. Bd4 Bc6 23. Bxg7 Kxg7 24. Qd4+ Kg8 25. Na5 Ba4 26. Rf1 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "1"]
[White "Wolthuis, Wim"]
[Black "Tan, Hiong Liong"]
[Result "1/2-1/2"]
[PlyCount "80"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Nf3 Ne4 6. Qc2 Bb7 7. Bd3 f5 8. a3
Bxc3+ 9. bxc3 O-O 10. O-O d6 11. Nd2 Nxd2 12. Bxd2 Qh4 13. f3 Nc6 14. e4 f4 15.
c5 dxc5 16. dxc5 Qe7 17. cxb6 axb6 18. a4 Ne5 19. Bb5 Bc6 20. Bxc6 Qc5+ 21. Kh1
Qxc6 22. Rfd1 Ra5 23. c4 Raa8 24. Rdc1 Rfd8 25. Ra3 Qd6 26. Ra2 Nd3 27. Rf1 Rd7
28. h3 Rad8 29. a5 bxa5 30. Bxa5 Nb4 31. Bxb4 Qxb4 32. Rb1 Qxb1+ 33. Qxb1 Rd1+
34. Qxd1 Rxd1+ 35. Kh2 Rc1 36. Ra6 Rxc4 37. Rxe6 Kf7 38. Re5 g6 39. h4 Kf6 40.
Ra5 Rc1 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Bernstein, Ossip"]
[Black "Crabbendam, H."]
[Result "1/2-1/2"]
[PlyCount "101"]

1. e4 c5 2. Nf3 Nf6 3. Nc3 d5 4. exd5 Nxd5 5. Bb5+ Bd7 6. Ne5 Bxb5 7. Qf3 f6 8.
Nxb5 Na6 9. Nc4 Qd7 10. Nbd6+ exd6 11. Qxd5 Nb4 12. Qh5+ g6 13. Qe2+ Kf7 14.
O-O Re8 15. Qd1 d5 16. Ne3 d4 17. Nc4 d3 18. cxd3 Nxd3 19. a4 Re4 20. Ne3 Bd6
21. Ra3 Nxc1 22. Qxc1 Rh4 23. f4 Re8 24. Qc4+ Qe6 25. Rb3 b6 26. g3 Rh5 27. a5
bxa5 28. Rb7+ Re7 29. Qxe6+ Kxe6 30. f5+ gxf5 31. Rxe7+ Bxe7 32. Kg2 Rg5 33. h4
Rg8 34. Nxf5 Rb8 35. g4 Bf8 36. Re1+ Kf7 37. Rb1 a4 38. Ra1 Rxb2 39. Rxa4 Rxd2+
40. Kf3 Rd7 41. Ke4 Kg6 42. Ra6 h6 43. Rc6 Rb7 44. Rc8 Kf7 45. Kd5 Rb4 46. h5
Rxg4 47. Rc7+ Kg8 48. Ke6 Rg5 49. Kxf6 Rxh5 50. Rc8 Rxf5+ 51. Kxf5 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Donner, Jan-Hein"]
[Black "Wolthuis, Wim"]
[Result "1-0"]
[PlyCount "83"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. e3 c6 7. Qc2 O-O 8. Bd3
h6 9. Bh4 Re8 10. Nf3 Ne4 11. Bxe7 Qxe7 12. O-O Nd7 13. b4 Qxb4 14. Nxe4 dxe4
15. Bxe4 Qe7 16. Bd3 Nf6 17. Rab1 Nd5 18. Qd2 a5 19. Rfc1 Nb4 20. Bc4 Bf5 21.
Rb2 b5 22. Be2 Rec8 23. Ne5 f6 24. Nd3 Nd5 25. Bf3 b4 26. Bxd5+ cxd5 27. Nc5
Rab8 28. a3 bxa3 29. Rxb8 Rxb8 30. Qxa5 Qf7 31. Qxa3 Kh7 32. h3 Qg6 33. Kh2 Qh5
34. Qa2 Qh4 35. Qe2 h5 36. Qf3 Be4 37. Nxe4 dxe4 38. Qf5+ Kh6 39. g3 g6 40. Qd5
Qg5 41. Qxe4 Rb2 42. Kg2 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Kuijpers, Frans"]
[Black "Johner, Hans"]
[Result "0-1"]
[PlyCount "68"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nf3 d6 6. O-O Nc6 7. d5 Na5 8. Nfd2
b6 9. e4 Bd7 10. Nc3 Nb7 11. f4 Nc5 12. Qe2 Ng4 13. Nf3 h5 14. h3 Nh6 15. Kh2
e6 16. dxe6 Nxe6 17. Be3 Re8 18. Rad1 Bc6 19. Ng5 Nc5 20. f5 Qe7 21. Qf3 Nxf5
22. Bc1 Be5 23. Rd5 Nxg3 24. Rf2 Ne2+ 25. Rxe5 Qxe5+ 26. Kh1 f6 27. Nxe2 Rf8
28. Bf4 Qe8 29. Qg3 fxg5 30. Qxg5 Nxe4 31. Bxe4 Qxe4+ 32. Kh2 Rae8 33. Ng3 Qb1
34. Rd2 Re1 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Langeweg, Kick"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[PlyCount "85"]

1. c4 Nf6 2. Nc3 d5 3. d4 e6 4. Nf3 c5 5. cxd5 exd5 6. Bg5 Nc6 7. e4 cxd4 8.
Nxd5 Be7 9. Nxe7 Qxe7 10. Bd3 h6 11. Bxf6 Qxf6 12. Nd2 O-O 13. O-O Ne5 14. Qe2
Bd7 15. Rad1 Rfd8 16. Nb3 Qb6 17. Nc1 Rac8 18. Rfe1 Ba4 19. Rd2 Qa5 20. h3 Nf3+
21. gxf3 Qg5+ 22. Kh2 Qf4+ 23. Kg2 Bd7 24. Nb3 Qg5+ 25. Kh2 Qf4+ 26. Kh1 Bxh3
27. Rg1 Qh4 28. Rg2 Bxg2+ 29. Kxg2 Qg5+ 30. Kf1 Qf4 31. e5 g6 32. e6 Re8 33.
exf7+ Kxf7 34. Be4 Qh2 35. Qb5 Rc7 36. Qd5+ Kg7 37. Qxd4+ Qe5 38. Qxe5+ Rxe5
39. Ke2 Rce7 40. Ke3 g5 41. Rd6 g4 42. Rg6+ Kf7 43. Rxg4 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Tan, Hiong Liong"]
[Black "De Rooi, Paul"]
[Result "1-0"]
[PlyCount "129"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 a6 6. Nd6+ Bxd6 7. Qxd6 Qf6 8.
Qc7 Nge7 9. Nc3 O-O 10. Be3 d6 11. O-O-O Rd8 12. Bc4 Bg4 13. f3 Rd7 14. Qb6 Nc8
15. Nd5 Nxb6 16. Nxf6+ gxf6 17. Bxb6 Be6 18. Bxe6 fxe6 19. Rd2 d5 20. Rhd1 d4
21. c3 Rc8 22. Rc2 Kf7 23. cxd4 exd4 24. Rxd4 Nxd4 25. Rxc8 Ne2+ 26. Kc2 Nf4
27. g3 Nd3 28. Rc3 Nb4+ 29. Kb3 Nc6 30. Be3 Rd1 31. a3 Rh1 32. Rc2 Rf1 33. Rf2
Re1 34. Bd2 Rd1 35. Kc2 Rh1 36. Bc3 f5 37. Kd3 b5 38. Rc2 Ke7 39. exf5 exf5 40.
Ke3 Ke6 41. Kf4 Rf1 42. Re2+ Kf7 43. Rd2 Ke6 44. Bb4 Nxb4 45. axb4 Rc1 46. b3
Rc3 47. Re2+ Kd5 48. Re5+ Kd4 49. Rxf5 Rxb3 50. Rf6 Rxb4 51. Rxa6 Ra4 52. Rd6+
Kc3+ 53. Kg5 Ra7 54. Rc6+ Kb3 55. f4 b4 56. f5 Ka2 57. Rc2+ Ka1 58. Rc1+ Ka2
59. f6 b3 60. Rf1 Rf7 61. Kf5 b2 62. Ke6 Rb7 63. f7 Rb6+ 64. Ke7 Rb7+ 65. Kf6
1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "2"]
[White "Wade, Robert G"]
[Black "Van den Berg, Carel"]
[Result "1/2-1/2"]
[PlyCount "85"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 d5 7. cxd5 Nxd5 8.
Qc2 cxd4 9. cxd4 Nc6 10. e4 Nde7 11. Bb2 Nxd4 12. Qa4+ Nec6 13. Rd1 e5 14. Bb5
O-O 15. Bxc6 bxc6 16. Bxd4 exd4 17. Qxd4 Qa5+ 18. Kf2 Qxa3 19. Ne2 Be6 20. Ra1
Qe7 21. Ra5 Rfd8 22. Qc3 Qc7 23. Rha1 Qxh2 24. Ng3 Qh6 25. Rxa7 Rab8 26. Nf1
Qg5 27. Rc1 h5 28. Ra6 h4 29. Rxc6 h3 30. gxh3 Rb3 31. Qc5 Qh4+ 32. Ke2 Qxh3
33. Qf2 Qh5 34. Ne3 Rb2+ 35. R6c2 Qb5+ 36. Ke1 Rxc2 37. Qxc2 Qa5+ 38. Qc3 Qg5
39. Ke2 Qg3 40. Nd1 Rc8 41. Qxc8+ Bxc8 42. Rxc8+ Kh7 43. Nf2 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "Crabbendam, H."]
[Black "Kuijpers, Frans"]
[Result "0-1"]
[PlyCount "68"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 g6 7. Be3 Bg7 8.
Qd2 O-O 9. f3 d5 10. Nxc6 bxc6 11. e5 Nd7 12. f4 e6 13. h4 c5 14. Bf2 Rb8 15.
h5 Qa5 16. hxg6 fxg6 17. g3 Rxb2 18. Nd1 Qxd2+ 19. Kxd2 Rb6 20. a4 Ba6 21. a5
Rc6 22. Bg4 g5 23. Ke3 d4+ 24. Ke4 Bc4 25. Rh5 gxf4 26. gxf4 Bd5+ 27. Kd3 Rxf4
28. Rh4 Nxe5+ 29. Kd2 Rxg4 30. Rxg4 Nxg4 31. Bg3 e5 32. Rb1 Rc8 33. Nf2 Nxf2
34. Bxf2 e4 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "De Rooi, Paul"]
[Black "Donner, Jan-Hein"]
[Result "0-1"]
[PlyCount "57"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Bd3 Nf6 6. O-O d6 7. Kh1 Nbd7 8. f4
Qc7 9. f5 e5 10. Nf3 b5 11. Bg5 Bb7 12. Qe2 Be7 13. Nbd2 O-O 14. Rae1 Nc5 15.
Qf2 h6 16. Qh4 Rfe8 17. Bxh6 gxh6 18. Qxh6 Nh7 19. g4 Bf8 20. Qh5 f6 21. g5
fxg5 22. Nxg5 Nf6 23. Qh4 Bg7 24. Re3 d5 25. Rh3 dxe4 26. Ndxe4 Rad8 27. Ne6
Rxe6 28. Rg1 Kf8 29. fxe6 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "Enevoldsen, Jens"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "91"]

1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. Be2 O-O 6. Bg5 c6 7. Nf3 h6 8. Bh4
Qa5 9. O-O Bg4 10. h3 Bxf3 11. Bxf3 Nbd7 12. Be2 e5 13. d5 cxd5 14. cxd5 a6 15.
Qd2 Rac8 16. Bg4 Rc7 17. Bxd7 Rxd7 18. Bxf6 Bxf6 19. Qxh6 Rc8 20. Rfe1 b5 21.
a3 Rc4 22. h4 Qd8 23. g3 Rdc7 24. Kg2 Rd4 25. Re2 Rd3 26. Rae1 Rc5 27. Na2 a5
28. Nc1 Rd4 29. Nb3 Bg7 30. Qg5 Bf6 31. Qg4 Rcxd5 32. Nxd4 Rxd4 33. Rc1 Kg7 34.
Qc8 a4 35. Qxd8 Bxd8 36. Rc8 Ba5 37. Rb8 b4 38. Rb5 Bd8 39. Rxb4 Kf6 40. f4 Ba5
41. fxe5+ dxe5 42. Rb5 Bd2 43. Rf2+ Kg7 44. Rxe5 Be1 45. Re2 Bd2 46. Rd5 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "Johner, Hans"]
[Black "Tan, Hiong Liong"]
[Result "1/2-1/2"]
[PlyCount "59"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4 7. Qc2 f5 8. O-O
Bxc3 9. bxc3 O-O 10. Nd2 Nxd2 11. Bxd2 Qh4 12. f3 Nc6 13. e4 fxe4 14. fxe4 e5
15. d5 Ne7 16. c5 bxc5 17. d6 cxd6 18. Qb3+ c4 19. Bxc4+ d5 20. Qxb7 dxc4 21.
Qxd7 Rfe8 22. Qe6+ Kh8 23. Qxc4 Ng8 24. Rae1 Nf6 25. Rf3 Rad8 26. Rh3 Qg4 27.
Rd3 Rxd3 28. Qxd3 Qe6 29. Qc2 h6 30. Qa4 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "Van den Berg, Carel"]
[Black "Langeweg, Kick"]
[Result "0-1"]
[PlyCount "70"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 b5 8. e5
dxe5 9. fxe5 Qc7 10. exf6 Qe5+ 11. Be2 Qxg5 12. O-O Ra7 13. Qd3 Rd7 14. Ne4 Qe5
15. Nf3 Qxb2 16. Qe3 Bb7 17. Rad1 Bxe4 18. fxg7 Qxg7 19. Qxe4 Bd6 20. Bd3 Rg8
21. Rd2 h5 22. a4 b4 23. Re1 Qg4 24. Qa8 Ke7 25. Re4 Qg7 26. Rde2 Qa1+ 27. Re1
Qxa4 28. Rxe6+ fxe6 29. Qe4 Kd8 30. Qxe6 Rgg7 31. Bf5 Qc6 32. Kh1 Rde7 33. Qf6
Nd7 34. Qh4 Kc7 35. Be4 Qc5 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "3"]
[White "Wolthuis, Wim"]
[Black "Wade, Robert G"]
[Result "0-1"]
[PlyCount "48"]

1. d4 Nf6 2. c4 e6 3. Nf3 Bb4+ 4. Bd2 a5 5. a3 Be7 6. Nc3 d5 7. Bg5 O-O 8. e3
h6 9. Bh4 b6 10. cxd5 exd5 11. Rc1 Be6 12. Bd3 c5 13. dxc5 bxc5 14. O-O Nbd7
15. e4 Nxe4 16. Nxe4 dxe4 17. Bxe7 Qxe7 18. Bxe4 Rab8 19. Qd2 Nf6 20. Bb1 Bd5
21. Qxa5 Bxf3 22. gxf3 Rxb2 23. Qxc5 Qb7 24. Qc6 Rxb1 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Bernstein, Ossip"]
[Black "Kuijpers, Frans"]
[Result "0-1"]
[PlyCount "74"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 g6 7. O-O Bg7 8.
Be3 O-O 9. Qd2 Bd7 10. Rad1 a6 11. h3 b5 12. a3 Qc7 13. Kh1 Qb7 14. Nb3 a5 15.
Bxb5 Nxe4 16. Nxe4 Qxb5 17. Nc3 Qh5 18. Qd5 Ne5 19. Nd4 Rac8 20. Ne4 Bg4 21.
Ng3 Qh4 22. Qe4 d5 23. Qf4 Bf6 24. Nge2 g5 25. Qh2 Bxe2 26. Nxe2 Rxc2 27. Rd4
Qh6 28. Nc3 e6 29. Bxg5 Qxg5 30. f4 Qg7 31. fxe5 Bxe5 32. Rg4 Bxh2 33. Rxg7+
Kxg7 34. Kxh2 Rxb2 35. Rf4 Rb3 36. Rg4+ Kh8 37. Ne2 Rxa3 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Donner, Jan-Hein"]
[Black "Johner, Hans"]
[Result "1-0"]
[PlyCount "59"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 Be7 6. Be2 O-O 7. Be3 Bd7 8. Qd2
Na6 9. f4 exf4 10. Bxf4 Ne8 11. Nf3 Bf6 12. O-O Qe7 13. Rae1 Rd8 14. Bd3 Be5
15. Nxe5 dxe5 16. Be3 Nd6 17. Nb5 Nxb5 18. cxb5 Nc7 19. Rc1 b6 20. b4 c4 21.
Bxc4 Qd6 22. a4 f5 23. exf5 Bxf5 24. Bb3 Kh8 25. Rc6 Qd7 26. Bg5 Rc8 27. d6 Ne6
28. Rxf5 Rxf5 29. Rxc8+ Qxc8 30. Bxe6 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Enevoldsen, Jens"]
[Black "Van den Berg, Carel"]
[Result "1-0"]
[PlyCount "80"]

1. e4 c5 2. Nf3 Nc6 3. c3 Nf6 4. d3 g6 5. g3 Bg7 6. Bg2 O-O 7. O-O b6 8. Ne1 e6
9. f4 d5 10. e5 Nd7 11. Nf3 a5 12. a4 f6 13. d4 cxd4 14. cxd4 fxe5 15. fxe5 Ba6
16. Rf2 Nb4 17. Be3 b5 18. axb5 Bxb5 19. Nc3 Bd3 20. Ne1 Rxf2 21. Bxf2 Ba6 22.
Bh3 Nf8 23. Be3 Nc6 24. Na4 Qb8 25. Qc2 Qb5 26. Nc5 Bc8 27. Bf1 Qb8 28. Ned3
Nb4 29. Nxb4 Qxb4 30. Ra3 Qb6 31. Rb3 Qc7 32. Rc3 Qe7 33. Nd3 Ba6 34. Rc7 Qd8
35. Qc6 Kh8 36. Nc5 Bxf1 37. Kxf1 a4 38. Bc1 Rb8 39. Kg2 Rb4 40. Rc8 Qe7 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Langeweg, Kick"]
[Black "Wolthuis, Wim"]
[Result "1-0"]
[PlyCount "71"]

1. c4 c6 2. Nf3 Nf6 3. d4 d5 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 e6 7. f3 Bb4 8. Bg5
h6 9. Bh4 c5 10. e4 Qxd4 11. Nxc4 Nxe4 12. Qxd4 cxd4 13. fxe4 Bg4 14. Ne5 O-O
15. Nxg4 dxc3 16. O-O-O Nc6 17. b3 Rac8 18. Bd3 g5 19. Nxh6+ Kg7 20. Bxg5 f6
21. Be3 Ne5 22. Kc2 Rh8 23. Rhf1 Rcf8 24. Bc4 Rxh6 25. Bxh6+ Kxh6 26. Bxe6 Kg7
27. Rd5 Re8 28. Bf5 Re7 29. Rf4 Nc6 30. Rh4 Re5 31. Rh7+ Kg8 32. Rxb7 Rxd5 33.
exd5 Nd4+ 34. Kb1 a5 35. Bc2 Kf8 36. h4 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Tan, Hiong Liong"]
[Black "Crabbendam, H."]
[Result "0-1"]
[PlyCount "58"]

1. e4 c5 2. Nf3 Nf6 3. d3 d6 4. g3 g6 5. Bg2 Bg7 6. O-O Nc6 7. Nbd2 Rb8 8. Nh4
e5 9. f4 exf4 10. Nc4 fxg3 11. Bf4 gxh2+ 12. Kh1 O-O 13. Bxd6 Nh5 14. Qe1 b5
15. Bxf8 Qxf8 16. Bf3 bxc4 17. Bxh5 gxh5 18. Rb1 cxd3 19. cxd3 Qd6 20. b3 Bg4
21. Qf2 Qxd3 22. Qxf7+ Kh8 23. Qd5 Nd4 24. Qd6 Qxe4+ 25. Ng2 Rg8 26. Rbe1 Qa8
27. Rf2 Nf3 28. Rd1 Bd4 29. Rc2 Bh3 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "4"]
[White "Wade, Robert G"]
[Black "De Rooi, Paul"]
[Result "1-0"]
[PlyCount "67"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 c5 6. d5 O-O 7. Nf3 e6 8. Be2 exd5
9. exd5 Bg4 10. O-O Nbd7 11. Ng5 Bxe2 12. Qxe2 Re8 13. Qd3 Ng4 14. Nf3 f5 15.
h3 Ngf6 16. Ng5 Nf8 17. Rb1 h6 18. Ne6 Nxe6 19. dxe6 Rxe6 20. b4 cxb4 21. Rxb4
b6 22. Kh2 Kh7 23. Ba3 Rc8 24. Rd1 a5 25. Rb3 Qc7 26. Bxd6 Qxc4 27. Be5 Qxd3
28. Rxd3 g5 29. Bxf6 Bxf6 30. Rd7+ Re7 31. Nd5 Rxd7 32. Nxf6+ Kg7 33. Nxd7 Rc2
34. fxg5 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "Crabbendam, H."]
[Black "Donner, Jan-Hein"]
[Result "1/2-1/2"]
[PlyCount "41"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Be3 Nf6 6. Nd2 e5 7. N4b3 d5 8.
exd5 Nxd5 9. Qh5 Nc6 10. Bc4 b5 11. Bb6 Qd7 12. Nc5 Bxc5 13. Bxc5 bxc4 14. Nxc4
Nf4 15. Qf3 Qd5 16. Nd6+ Kd7 17. Qxd5 Nxd5 18. Nxf7 Re8 19. O-O-O Ke6 20. Ng5+
Kf5 21. Nf7 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "De Rooi, Paul"]
[Black "Langeweg, Kick"]
[Result "0-1"]
[PlyCount "62"]

1. e4 c5 2. Ne2 Nf6 3. Nbc3 d6 4. g3 Nc6 5. Bg2 g6 6. O-O Bg7 7. d3 O-O 8. h3
Ne8 9. Be3 Nd4 10. Kh2 Bd7 11. Qd2 Rc8 12. Rae1 Bc6 13. f4 f5 14. Nd1 e6 15. c3
Nxe2 16. Qxe2 b6 17. Bd2 Nc7 18. Nf2 Qd7 19. g4 Rce8 20. g5 e5 21. fxe5 Bxe5+
22. Kg1 d5 23. Bc1 Bg3 24. Rd1 Qe6 25. Qc2 dxe4 26. dxe4 Bxf2+ 27. Rxf2 Bxe4
28. Qa4 Bxg2 29. Rxg2 a5 30. h4 f4 31. Bxf4 b5 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "Johner, Hans"]
[Black "Wade, Robert G"]
[Result "0-1"]
[PlyCount "88"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 O-O 8. c3
d6 9. h3 Nd7 10. d4 Nb6 11. Nbd2 Bf6 12. Nf1 g6 13. Ne3 Na5 14. Bc2 Bg7 15. Ng4
Bxg4 16. hxg4 Qd7 17. Nh4 Qe7 18. g3 exd4 19. cxd4 c5 20. dxc5 dxc5 21. f4 Bd4+
22. Kg2 Rad8 23. Qe2 Nc6 24. Nf3 Nc4 25. Bd3 Bxb2 26. Bxb2 Nxb2 27. Bxb5 axb5
28. Qxb2 Nd4 29. Rad1 Nxf3 30. Kxf3 c4 31. Rxd8 Rxd8 32. Qxb5 Qa3+ 33. Kf2
Qxa2+ 34. Re2 Qa7+ 35. Kf3 Qd4 36. Qb2 c3 37. Qc2 Rb8 38. Re3 Rc8 39. g5 Qb4
40. Re1 Qc4 41. Rd1 Qc5 42. Rd3 Kg7 43. Rd1 Qc4 44. Rd3 Qxd3+ 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "Kuijpers, Frans"]
[Black "Tan, Hiong Liong"]
[Result "1-0"]
[PlyCount "109"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 d6 6. f3 c5 7. e4 Nc6 8. Be3
Qa5 9. Qd2 cxd4 10. cxd4 Qxd2+ 11. Kxd2 e5 12. Ne2 Na5 13. Nc1 Nd7 14. Rb1 Nb6
15. Kc3 exd4+ 16. Bxd4 Na4+ 17. Kd2 O-O 18. Nb3 Nc6 19. Bf2 f5 20. Bg3 fxe4 21.
fxe4 Be6 22. Bd3 Rfd8 23. Rhc1 Rac8 24. Ke3 Ne5 25. Nd4 Bxc4 26. Bc2 Nb6 27.
Nf5 Rc5 28. Rd1 Ba2 29. Rbc1 Nf7 30. Kf2 Kh8 31. Nxd6 Nxd6 32. Bxd6 Rc6 33. Bf4
Rxc2+ 34. Rxc2 Rxd1 35. Rxa2 Rd4 36. Kf3 Ra4 37. Bd6 Kg8 38. Bc5 Nd7 39. Bd6
Kf7 40. Rd2 Ke6 41. Rd3 Nf6 42. Bf8 Kf7 43. Bb4 a5 44. Be1 g5 45. Rb3 g4+ 46.
Ke2 Rxe4+ 47. Kf1 a4 48. Rxb7+ Ke6 49. Ra7 Nd5 50. Bd2 h5 51. Kf2 Kd6 52. h3
gxh3 53. gxh3 Nf4 54. Kf3 Ke5 55. Re7+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "Van den Berg, Carel"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "69"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c5 6. d4 cxd4 7. Qxd4 d6 8. Nc3
Nc6 9. Qh4 Be6 10. Ng5 Bd7 11. Rd1 Rc8 12. Nd5 h5 13. Rb1 Ne5 14. b3 Nxd5 15.
Bxd5 Bf5 16. Be4 Bxe4 17. Nxe4 Qa5 18. Qxe7 Qxa2 19. Bb2 Nc6 20. Nf6+ Kh8 21.
Qe3 Ne5 22. Nd5 Rfe8 23. Qd2 Qa6 24. f4 Ng4 25. Bxg7+ Kxg7 26. Qd4+ Kh6 27. h3
Rxe2 28. hxg4 hxg4 29. Ra1 Qc6 30. Re1 Qe8 31. Kf1 Re6 32. Kf2 f6 33. Nxf6 Qf7
34. Rxe6 Qxe6 35. Rh1+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "5"]
[White "Wolthuis, Wim"]
[Black "Enevoldsen, Jens"]
[Result "1/2-1/2"]
[PlyCount "80"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. Bg5 h6 8. Bf4
c5 9. d5 a6 10. a4 Ne8 11. Qd2 Kh7 12. O-O b6 13. Rfe1 Ne5 14. Nxe5 dxe5 15.
Be3 Nd6 16. a5 Bd7 17. axb6 Qxb6 18. b4 Nb7 19. Reb1 Qc7 20. Na4 Bxa4 21. Rxa4
h5 22. Rba1 cxb4 23. Rxa6 Rxa6 24. Rxa6 b3 25. Qb4 Bh6 26. Bxh6 Kxh6 27. Qxb3
Kg7 28. Rc6 Qd7 29. Qa4 f6 30. Qa7 Rc8 31. Qb6 Nd6 32. f3 Rxc6 33. dxc6 Qc8 34.
c7 Kf7 35. Qb8 Qa6 36. Kf2 Qc6 37. Kg3 Qc5 38. h3 g5 39. Qh8 h4+ 40. Kh2 Qxc7
1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Bernstein, Ossip"]
[Black "Tan, Hiong Liong"]
[Result "1/2-1/2"]
[PlyCount "145"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. d4 cxd4 5. Nxd4 b5 6. Bd3 Bb7 7. a4 bxa4 8.
Rxa4 d6 9. O-O Nf6 10. f4 Nfd7 11. Rb4 Nc5 12. Be3 Qc7 13. Qg4 Nbd7 14. f5 Nf6
15. Qe2 e5 16. Nb3 Nxd3 17. cxd3 d5 18. Bb6 Qc8 19. Ra4 Qb8 20. Bc5 Bc6 21.
Bxf8 Kxf8 22. Ra3 d4 23. Nb1 Ke7 24. Na5 Rc8 25. Nc4 Bb5 26. Nbd2 Kf8 27. Qe1
Ra7 28. b3 Nd7 29. Nf3 Bxc4 30. bxc4 Rc6 31. Qg3 Rb7 32. h3 Rb2 33. Kh2 f6 34.
Rfa1 Nc5 35. Qh4 Kg8 36. Qe1 g6 37. fxg6 hxg6 38. Qg3 Kh7 39. Rf1 Qc7 40. Nh4
Qg7 41. Rf3 Ne6 42. Rf2 Rb1 43. Rfa2 Nc5 44. Qg4 Rcb6 45. Qc8 Qh6 46. Qc7+ Kg8
47. Qd8+ Kh7 48. Qe7+ Kg8 49. Qe8+ Kg7 50. Qe7+ Kg8 51. Nxg6 Qxg6 52. Qxc5 R6b2
53. Qc8+ Kf7 54. Rxb2 Rxb2 55. Qg4 Qxg4 56. hxg4 Kg6 57. Kh3 Kg5 58. Kg3 Rd2
59. Kf3 a5 60. c5 a4 61. Kg3 Rc2 62. Rxa4 Rxc5 63. Ra8 Kg6 64. g5 Kxg5 65. Rg8+
Kh5 66. Kf3 Rc3 67. g4+ Kh6 68. g5+ fxg5 69. Kg4 Rxd3 70. Re8 Rd1 71. Re6+ Kg7
72. Rxe5 Rg1+ 73. Kf3 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Donner, Jan-Hein"]
[Black "Kuijpers, Frans"]
[Result "1-0"]
[PlyCount "85"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 h6 5. Bh4 c5 6. d5 d6 7. e3 Bxc3+ 8. bxc3
e5 9. f3 O-O 10. e4 Nbd7 11. Bd3 Re8 12. Bf2 Nf8 13. Be3 Ng6 14. Qd2 Nh5 15.
Kf2 Qh4+ 16. Kf1 Ng3+ 17. hxg3 Qxh1 18. Kf2 Rf8 19. Rf1 Qh2 20. Ne2 Ne7 21. g4
Qh4+ 22. Ng3 Qf6 23. g5 Qg6 24. gxh6 f5 25. exf5 Nxf5 26. Bxf5 Bxf5 27. Rh1 Rf7
28. Rh4 Bb1 29. Qb2 Qc2+ 30. Qxc2 Bxc2 31. hxg7 Rxg7 32. Nh5 Rg6 33. g4 Kf7 34.
f4 Bd1 35. Ng3 exf4 36. Bxf4 Bxg4 37. Ne4 Rag8 38. Nxd6+ Kf6 39. Nxb7 Kf5 40.
Bc7 Rf8 41. Ke3 Ra6 42. Rh2 Ra3 43. Rf2+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Enevoldsen, Jens"]
[Black "De Rooi, Paul"]
[Result "1-0"]
[PlyCount "69"]

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O d6 6. d4 c6 7. Nc3 Nbd7 8. e4
e5 9. Be3 Re8 10. dxe5 dxe5 11. Qc2 Qc7 12. h3 Nf8 13. Rfd1 Be6 14. Qa4 N6d7
15. b3 f5 16. Qa3 f4 17. Bc1 fxg3 18. fxg3 Bf7 19. Be3 Ne6 20. Qd6 Qxd6 21.
Rxd6 Red8 22. Rad1 Nb6 23. c5 Rxd6 24. Rxd6 Nc8 25. Rd7 Rb8 26. Bf1 Be8 27. Rd1
Kf8 28. Bc4 Nc7 29. Ng5 h6 30. Rf1+ Ke7 31. Nf7 Ne6 32. Nxh6 b5 33. Be2 Rb7 34.
Bg4 Rd7 35. Ng8+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Langeweg, Kick"]
[Black "Johner, Hans"]
[Result "1-0"]
[PlyCount "87"]

1. c4 e5 2. Nc3 g6 3. g3 Bg7 4. Bg2 d6 5. d3 Nc6 6. Nf3 Nge7 7. O-O O-O 8. Ne1
Be6 9. Nd5 Qd7 10. Rb1 Nd8 11. b4 c6 12. Nxe7+ Qxe7 13. b5 c5 14. Nc2 Qd7 15.
Re1 d5 16. Ne3 d4 17. Nd5 Bxd5 18. Bxd5 Ne6 19. a4 Rab8 20. a5 a6 21. Ba3 Nc7
22. Bg2 Qd6 23. Qb3 axb5 24. cxb5 Rfc8 25. Rec1 Ne6 26. b6 Bf8 27. Bxb7 Rxb7
28. a6 Rbb8 29. b7 Qxa6 30. bxc8=Q Rxc8 31. Ra1 Qc6 32. Rcb1 Qd7 33. Bc1 Kg7
34. Qb7 Rc7 35. Qe4 Bd6 36. Ra6 Ra7 37. Rxa7 Qxa7 38. Qd5 Qe7 39. Rb7 Nc7 40.
Qc6 Qd8 41. Bd2 Ne8 42. h4 h6 43. Rd7 Qb8 44. Qd5 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Van den Berg, Carel"]
[Black "Wolthuis, Wim"]
[Result "1/2-1/2"]
[PlyCount "80"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. d4 Nf6 7. O-O Nxe4 8. Re1
f5 9. dxe5 dxe5 10. Nbd2 Nxd2 11. Nxe5 Nxe5 12. Rxe5+ Be7 13. Bxd2 O-O 14. Bf4
Bd6 15. Bxd7 Qxd7 16. Rd5 Rad8 17. Qb3 Qe6 18. Bxd6 Rxd6 19. Rxd6 Qxb3 20. axb3
cxd6 21. Rd1 Rf6 22. Kf1 Re6 23. Rd4 Kf7 24. f3 Ke7 25. Rb4 b5 26. Rd4 Re5 27.
Kf2 g6 28. b4 Kd7 29. Rd1 Kc6 30. Ra1 Kb6 31. Rd1 Kc6 32. g3 Re6 33. Rd3 Re5
34. b3 d5 35. Re3 Kd6 36. Rxe5 Kxe5 37. Ke3 g5 38. f4+ gxf4+ 39. gxf4+ Ke6 40.
Kd4 Kd6 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "6"]
[White "Wade, Robert G"]
[Black "Crabbendam, H."]
[Result "1/2-1/2"]
[PlyCount "48"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. g3 dxc4 5. Bg2 Nf6 6. Nf3 Nbd7 7. O-O Nd5 8. e4
Nxc3 9. bxc3 b5 10. d5 Bb7 11. Nd4 e5 12. dxc6 exd4 13. cxb7 Rb8 14. e5 Qb6 15.
cxd4 Rxb7 16. Bxb7 Qxb7 17. d5 Bb4 18. Qg4 Nxe5 19. Qxg7 Nf3+ 20. Kh1 Qxd5 21.
Qxh8+ Kd7 22. Bf4 Nd2+ 23. Kg1 Nf3+ 24. Kh1 Nd2+ 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "Crabbendam, H."]
[Black "Langeweg, Kick"]
[Result "0-1"]
[PlyCount "84"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nxc6 bxc6 6. c4 Nf6 7. Bd3 d5 8.
cxd5 cxd5 9. Nc3 Be7 10. Bb5+ Bd7 11. Bxd7+ Qxd7 12. e5 Ne4 13. Nxe4 dxe4 14.
Qxd7+ Kxd7 15. Bd2 f5 16. Ke2 Rab8 17. Bc3 Rb5 18. Rhd1+ Rd5 19. f3 exf3+ 20.
gxf3 Rc8 21. Rxd5+ exd5 22. Rd1 Ke6 23. Rd4 Rc6 24. Kd3 g5 25. Ra4 a6 26. f4 g4
27. Bd4 h5 28. b4 h4 29. Ke3 Kf7 30. Bc5 h3 31. Kf2 d4 32. Bxe7 Rc2+ 33. Kg1
Kxe7 34. Ra3 Rg2+ 35. Kh1 Rd2 36. Kg1 d3 37. Rxa6 Rg2+ 38. Kf1 Rxh2 39. Ra7+
Ke6 40. Ra6+ Kd5 41. Rd6+ Ke4 42. e6 g3 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "De Rooi, Paul"]
[Black "Van den Berg, Carel"]
[Result "1-0"]
[PlyCount "77"]

1. e4 c5 2. Nf3 e6 3. c4 Nc6 4. b3 Nf6 5. d3 Be7 6. Be2 Nxe4 7. dxe4 Bf6 8. Bd2
Bxa1 9. Nc3 Bxc3 10. Bxc3 O-O 11. e5 Qe7 12. h4 Rd8 13. Bd3 d6 14. Bxh7+ Kf8
15. Ng5 dxe5 16. Qh5 Qf6 17. Rh3 g6 18. Qf3 Qf5 19. Qxf5 gxf5 20. h5 Ke7 21. f4
exf4 22. Bg7 b6 23. Rh4 Bb7 24. Rxf4 Nb4 25. Bxf5 Rd7 26. Bb1 f5 27. Nxe6 Kxe6
28. Bxf5+ Ke7 29. Bxd7 Nd3+ 30. Kd2 Nxf4 31. Bg4 Bxg2 32. h6 Ng6 33. Bh5 Nh8
34. Ke3 Bc6 35. Kf4 Be8 36. Bf3 Rd8 37. Bxh8 Bg6 38. Kg5 Bb1 39. Bf6+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "Johner, Hans"]
[Black "Enevoldsen, Jens"]
[Result "0-1"]
[PlyCount "112"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. c3 Bd7 6. O-O Nf6 7. Re1 Be7 8. d4
O-O 9. Nbd2 b5 10. Bc2 exd4 11. cxd4 Nb4 12. Bb1 c5 13. d5 a5 14. Nf1 Re8 15.
a3 Na6 16. Ng3 Ng4 17. h3 Ne5 18. Nxe5 dxe5 19. Be3 a4 20. Qh5 g6 21. Qe2 c4
22. Kh2 Qc7 23. Bd2 Nc5 24. Bc2 Bd6 25. Bb4 Rac8 26. Qd2 Qd8 27. Re3 Qh4 28.
Kg1 Bf8 29. Rf3 Bh6 30. Qc3 Nb3 31. Bxb3 cxb3 32. Qd3 Rc2 33. Bc3 Bg7 34. Re1
Rc8 35. d6 Qd8 36. Rd1 Qe8 37. Ra1 Rc4 38. Nf1 Rd4 39. Bxd4 exd4 40. Re1 Rxb2
41. e5 Bxe5 42. Nd2 Rc2 43. Ne4 Qd8 44. g4 Bc6 45. g5 Bxd6 46. Rf6 Be7 47. Rxc6
Rxc6 48. Qxb5 Rb6 49. Nf6+ Bxf6 50. Re8+ Kg7 51. gxf6+ Qxf6 52. Qf1 Qg5+ 53.
Kh1 b2 54. Re1 Qf5 55. Rb1 Qf3+ 56. Kh2 Qxa3 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "Kuijpers, Frans"]
[Black "Wade, Robert G"]
[Result "0-1"]
[PlyCount "154"]

1. Nf3 c5 2. c4 g6 3. g3 Bg7 4. Bg2 Nc6 5. O-O Nh6 6. Nc3 O-O 7. Rb1 Nf5 8. a3
Nfd4 9. d3 Nxf3+ 10. Bxf3 b6 11. Bd2 Bb7 12. b4 cxb4 13. axb4 Rb8 14. Bg2 Ne5
15. Qa4 Bxg2 16. Kxg2 Qc7 17. f3 Qb7 18. Ra1 Nc6 19. b5 Nd4 20. Ra3 Ra8 21.
Rfa1 e6 22. R1a2 Rfb8 23. Qd1 d5 24. cxd5 exd5 25. e3 Nf5 26. d4 Rd8 27. Qb3 h5
28. Ne2 Nd6 29. Ra4 Bh6 30. Nf4 Bxf4 31. gxf4 Nc4 32. Bc1 Rdc8 33. Qb1 Qd7 34.
Kh1 Qh3 35. Rf2 Nd6 36. Bd2 Qd7 37. Rb4 Re8 38. Rg2 Kh7 39. Qd3 Rac8 40. Rg5
Qh3 41. Rg3 Qf5 42. Qf1 Qc2 43. Rg2 Nc4 44. Qe1 Qd3 45. Ra4 Nxd2 46. Qxd2 Qf1+
47. Rg1 Qxf3+ 48. Qg2 Qxg2+ 49. Rxg2 Rxe3 50. Rxa7 Kg7 51. Rd7 Rc1+ 52. Rg1 Rc2
53. f5 g5 54. Rxg5+ Kf6 55. h4 Rh3+ 56. Kg1 Rxh4 57. Rg2 Rxg2+ 58. Kxg2 Rxd4
59. Rb7 Kxf5 60. Rxb6 Rb4 61. Rb7 Kg4 62. b6 Rb2+ 63. Kf1 f5 64. Rd7 Kf3 65.
Kg1 Ke4 66. b7 d4 67. Re7+ Kf3 68. Rd7 Ke3 69. Re7+ Kd3 70. Rf7 h4 71. Kf1 h3
72. Rxf5 Rxb7 73. Rf3+ Kd2 74. Rxh3 Rf7+ 75. Kg2 Ke2 76. Rh8 Rg7+ 77. Kh2 d3
0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "Tan, Hiong Liong"]
[Black "Donner, Jan-Hein"]
[Result "1-0"]
[PlyCount "100"]

1. c4 Nf6 2. Nc3 g6 3. d4 Bg7 4. Bg5 d6 5. e3 Nbd7 6. Be2 c6 7. Nf3 h6 8. Bh4
g5 9. Bg3 Nh5 10. Qc2 Nxg3 11. hxg3 e6 12. O-O-O Nf6 13. Nd2 Qe7 14. f4 Bd7 15.
e4 O-O-O 16. e5 Ne8 17. Bh5 gxf4 18. gxf4 f6 19. Nf3 fxe5 20. dxe5 dxe5 21.
fxe5 Bxe5 22. Nxe5 Qg5+ 23. Qd2 Qxe5 24. Bxe8 Rhxe8 25. Rxh6 Re7 26. Rh4 Rg8
27. Rd4 Qg5 28. Ne4 Qxd2+ 29. R1xd2 Rf8 30. Nc5 Rf1+ 31. Rd1 Rxd1+ 32. Rxd1 Be8
33. b3 Bg6 34. Kd2 Bf5 35. Ke3 Rg7 36. Rd2 Rg4 37. Kf3 b6 38. Nd7 c5 39. Ne5
Rg7 40. Kf4 Kc7 41. g4 Bh7 42. g5 Bf5 43. Rg2 Bg6 44. Nxg6 Rxg6 45. Rd2 Rg7 46.
Kg4 Rg8 47. Kh5 Rh8+ 48. Kg6 Rh3 49. Kf6 Rg3 50. g6 e5 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "7"]
[White "Wolthuis, Wim"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "131"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. Nf3 h6 6. Bh4 O-O 7. e3 Ne4 8. Bxe7
Qxe7 9. Qc2 c6 10. Bd3 Nxc3 11. Qxc3 Nd7 12. O-O dxc4 13. Qxc4 e5 14. Qc2 exd4
15. Nxd4 Ne5 16. Be4 Ng4 17. h3 Nf6 18. Bf3 Be6 19. Nxe6 Qxe6 20. Rfd1 Rfd8 21.
Qa4 Qe5 22. Qb4 Qc7 23. Rac1 a5 24. Qc5 Rxd1+ 25. Rxd1 Rd8 26. Rxd8+ Qxd8 27.
g3 Qd2 28. Qb6 Qb4 29. Qxb4 axb4 30. Kf1 Nd7 31. Ke2 Nc5 32. a3 bxa3 33. bxa3
Kf8 34. Bg2 Ke7 35. e4 Kd6 36. f4 f6 37. Ke3 Ne6 38. h4 Nc7 39. Bf1 b5 40. Kd4
Ne6+ 41. Kd3 Kc5 42. Be2 Kb6 43. Bg4 Nc7 44. Bd7 Kc5 45. Bg4 Kd6 46. Kd4 c5+
47. Kc3 Ke7 48. Be2 g5 49. hxg5 hxg5 50. Kd2 gxf4 51. gxf4 Kd6 52. Kc3 Kc6 53.
Bf3 Kb6 54. Bg4 Ka5 55. Bd7 Ka4 56. Kb2 Na8 57. Be6 Nb6 58. e5 fxe5 59. f5 e4
60. f6 e3 61. Kc2 Nc4 62. Bxc4 bxc4 63. f7 e2 64. Kd2 c3+ 65. Kxe2 c2 66. Kd2
1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Bernstein, Ossip"]
[Black "Donner, Jan-Hein"]
[Result "0-1"]
[PlyCount "74"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 b5 6. Bd3 Bb7 7. a4 b4 8. Nce2
Nf6 9. Ng3 h5 10. h4 d5 11. e5 Ne4 12. Qf3 Nd7 13. Nxe6 fxe6 14. Nxe4 Nxe5 15.
Qg3 Nxd3+ 16. cxd3 dxe4 17. Qg6+ Kd7 18. Bf4 Qf6 19. Qg3 exd3 20. O-O Be7 21.
Rac1 Rhc8 22. Qxd3+ Bd5 23. Rxc8 Rxc8 24. Bg5 Qf5 25. Qxa6 Bxg5 26. hxg5 Qe4
27. f3 Qd4+ 28. Kh1 Rc2 29. Qb5+ Ke7 30. Qb8 h4 31. Kh2 Qd2 32. Rg1 Kf7 33. Qe5
Kg6 34. a5 Qxg5 35. Qd6 Qg3+ 36. Qxg3+ hxg3+ 37. Kxg3 Rxb2 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Enevoldsen, Jens"]
[Black "Crabbendam, H."]
[Result "1/2-1/2"]
[PlyCount "175"]

1. Nf3 d5 2. g3 Nd7 3. c4 dxc4 4. Qa4 g6 5. Bg2 Bg7 6. Qxc4 Nb6 7. Qc2 Nf6 8.
O-O O-O 9. d3 c6 10. Nc3 Nfd5 11. a3 h6 12. e4 Nf6 13. a4 a5 14. h3 Be6 15. Ne2
Ne8 16. Nf4 Bc8 17. Be3 e5 18. Ne2 Nd7 19. Rfd1 Qe7 20. d4 exd4 21. Nfxd4 Nef6
22. Nb3 Re8 23. Nc5 Kh7 24. Rac1 Rb8 25. Bf4 Ne5 26. Nd4 Nh5 27. Be3 b6 28. Nd3
Bb7 29. Nxe5 Bxe5 30. Nxc6 Bxc6 31. Qxc6 Bxb2 32. Rb1 Rec8 33. Qb5 Bg7 34. Bxb6
Nf6 35. Qd3 h5 36. Bxa5 Ra8 37. Bb4 Qa7 38. a5 Rd8 39. Qe2 h4 40. g4 Re8 41. g5
Nh5 42. Qg4 Rad8 43. Qxh4 Be5 44. Kh1 Kg7 45. Be1 Nf4 46. Bf1 Rh8 47. Qg4 Nxh3
48. Bxh3 Rxh3+ 49. Qxh3 Rh8 50. Qxh8+ Kxh8 51. Kg2 Qe7 52. Bd2 Bc7 53. Rh1+ Kg8
54. Rh4 f5 55. Rb7 f4 56. Rxc7 Qxc7 57. Bxf4 Qxa5 58. Be3 Qe5 59. Kf3 Kg7 60.
Rh1 Qe6 61. Bd4+ Kf7 62. Rh7+ Kf8 63. Be3 Kg8 64. Ra7 Kf8 65. Ra8+ Kf7 66. Ra7+
Kf8 67. Rb7 Qe5 68. Rb6 Kg7 69. Rb7+ Kg8 70. Rb6 Kg7 71. Rf6 Qa1 72. Kg2 Qe5
73. f3 Qc3 74. Bf4 Qb2+ 75. Kg3 Qa1 76. Kg4 Qg1+ 77. Bg3 Qc5 78. Kh4 Qb4 79.
Rc6 Qd4 80. Be1 Qe3 81. Bc3+ Kh7 82. Kg4 Qg1+ 83. Kf4 Qh2+ 84. Ke3 Qg1+ 85. Kf4
Qh2+ 86. Ke3 Qg1+ 87. Kf4 Qh2+ 88. Ke3 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Langeweg, Kick"]
[Black "Kuijpers, Frans"]
[Result "1-0"]
[PlyCount "81"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. d4 Nbd7 5. cxd5 exd5 6. Bg5 h6 7. Bh4 Be7 8.
e3 c6 9. Bd3 O-O 10. Qc2 Re8 11. O-O Ne4 12. Bxe4 Bxh4 13. Bh7+ Kh8 14. Bd3 Bf6
15. b4 Nb6 16. b5 cxb5 17. Bxb5 Bd7 18. Qb3 Bxb5 19. Qxb5 Re6 20. Rfc1 Rc8 21.
Na4 Rec6 22. Nc5 Qc7 23. g3 Qe7 24. Rab1 R8c7 25. Re1 Nc4 26. Qa4 b6 27. Na6
Rc8 28. Nb4 Rd6 29. Rec1 Qb7 30. Qa6 Qxa6 31. Nxa6 b5 32. Nc5 a6 33. a4 bxa4
34. Nxa4 Rdc6 35. Ne1 Be7 36. Nd3 Ba3 37. Rc2 R6c7 38. Nf4 Rd7 39. Rb3 Be7 40.
Nxd5 Rxd5 41. Rbc3 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Van den Berg, Carel"]
[Black "Johner, Hans"]
[Result "0-1"]
[PlyCount "88"]

1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. Nc3 d6 6. Nf3 Nbd7 7. O-O c6 8. Qc2
e5 9. Rd1 Qc7 10. b3 Re8 11. e4 a5 12. Ba3 exd4 13. Nxd4 Bf8 14. Rd2 Nc5 15.
Rad1 Bd7 16. Bb2 Rad8 17. Nde2 Nh5 18. Bf3 Ng7 19. Nf4 f5 20. Re2 fxe4 21. Bxe4
Bf5 22. Bxf5 Nxf5 23. Rxe8 Rxe8 24. Nh5 Qd8 25. a3 Qg5 26. Nd5 cxd5 27. Nf6+
Kf7 28. Nxe8 Kxe8 29. cxd5 Qg4 30. h3 Qxh3 31. Qe2+ Be7 32. b4 axb4 33. axb4
Nd7 34. Ra1 Nh6 35. Qe6 Qxe6 36. dxe6 Ne5 37. Ra8+ Bd8 38. f4 Neg4 39. b5 Nf5
40. Kg2 h5 41. Rb8 Ke7 42. b6 Nge3+ 43. Kf3 Nd5 44. Rxb7+ Kxe6 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Wade, Robert G"]
[Black "Tan, Hiong Liong"]
[Result "0-1"]
[PlyCount "115"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Qb3 c5 6. dxc5 Bxc5 7. g3 Bb7 8. Bg2
Nc6 9. O-O Qc8 10. Bg5 Na5 11. Qc2 Nxc4 12. Bxf6 gxf6 13. Ne4 Be7 14. Rac1 d5
15. Ned2 Nd6 16. Qa4+ Qd7 17. Qh4 h5 18. Bh3 f5 19. Qd4 f6 20. Nh4 Kf7 21. Qf4
Bf8 22. e3 Rc8 23. Nb3 Rc4 24. Nd4 Bh6 25. Qf3 Bg5 26. Ndxf5 exf5 27. Nxf5 Nxf5
28. Bxf5 Qc6 29. Rxc4 dxc4 30. e4 h4 31. Rd1 Bc8 32. Qg4 hxg3 33. hxg3 Ke7 34.
Rd5 Be6 35. Qe2 Kf7 36. Bxe6+ Qxe6 37. Qxc4 Re8 38. f4 Bxf4 39. Rd7+ Kg6 40.
Qxe6 Be3+ 41. Kg2 Rxe6 42. Kf3 Bc1 43. Rxa7 Bxb2 44. a4 Re5 45. Rb7 Bd4 46. Rd7
Bc5 47. Kf4 Rh5 48. Rd8 Rh1 49. Rg8+ Kf7 50. Ra8 Bd6+ 51. Kg4 Rg1 52. Kf5 Rxg3
53. Ra7+ Be7 54. Rb7 Rf3+ 55. Kg4 Ra3 56. Rxb6 Rxa4 57. Kf5 Ra5+ 58. Kg4 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "8"]
[White "Wolthuis, Wim"]
[Black "De Rooi, Paul"]
[Result "1/2-1/2"]
[PlyCount "81"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f4 c5 6. d5 Bg4 7. Be2 h5 8. Nf3 h4
9. e5 Nfd7 10. e6 Bxc3+ 11. bxc3 fxe6 12. Ng5 Bxe2 13. Qxe2 exd5 14. Qe6 Nf8
15. Qxd5 Nc6 16. O-O Qa5 17. Rb1 O-O-O 18. Nf7 Rh5 19. Qd3 Rd7 20. Ng5 e6 21.
Ne4 Qd8 22. Be3 b6 23. Rf2 d5 24. cxd5 Rhxd5 25. Qa6+ Kc7 26. Nxc5 bxc5 27.
Rb7+ Kd6 28. Rb5 Ke7 29. Qxc6 Rd1+ 30. Rf1 Rxf1+ 31. Kxf1 Rd1+ 32. Kf2 Qd3 33.
Qxc5+ Kf7 34. Rb7+ Kg8 35. Kf3 Qf1+ 36. Bf2 h3 37. g3 Rd3+ 38. Kg4 Rd5 39. Qe7
Qd1+ 40. Kxh3 Qf1+ 41. Kg4 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "Crabbendam, H."]
[Black "Van den Berg, Carel"]
[Result "0-1"]
[PlyCount "56"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. Ne2
cxd4 9. exd4 dxc4 10. Bxc4 b6 11. Bg5 Be7 12. a3 Bb7 13. b4 Nd5 14. Qd2 Bxg5
15. Nxg5 Nce7 16. Bd3 Nf5 17. Ng3 Qf6 18. Nxf5 exf5 19. Nf3 Rad8 20. Rfd1 Nc7
21. Qf4 Ne6 22. Qxf5 Qxf5 23. Bxf5 Bxf3 24. gxf3 Nxd4 25. Be4 f5 26. Bb7 Rd6
27. a4 Rb8 28. Bc6 Rg6+ 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "De Rooi, Paul"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "51"]

1. c4 Nf6 2. Nc3 g6 3. d4 Bg7 4. e4 d6 5. Nf3 Bg4 6. Be3 O-O 7. h3 Bxf3 8. Qxf3
Nbd7 9. Rd1 c6 10. Be2 a6 11. O-O b5 12. e5 dxe5 13. Qxc6 b4 14. dxe5 Nxe5 15.
Qa4 Qb8 16. Nd5 Nxd5 17. Rxd5 e6 18. Rd2 Rc8 19. b3 a5 20. f4 Nc6 21. Bf3 Ra6
22. Qb5 Qa8 23. Rfd1 Bf8 24. Rd7 a4 25. Qg5 axb3 26. Qf6 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "Donner, Jan-Hein"]
[Black "Wade, Robert G"]
[Result "1-0"]
[PlyCount "177"]

1. d4 e6 2. Nf3 Nf6 3. c4 d5 4. cxd5 exd5 5. Nc3 c6 6. Bg5 Bf5 7. Qb3 Qb6 8.
Qxb6 axb6 9. Bxf6 gxf6 10. Nh4 Be6 11. e3 b5 12. Bd3 Nd7 13. Kd2 Nb6 14. Kc2
Be7 15. Ne2 Nc4 16. Nf5 Bxf5 17. Bxf5 O-O 18. Bd3 Ra5 19. a3 Rfa8 20. Nc1 R5a7
21. Nb3 Na5 22. Rac1 Nxb3 23. Kxb3 Ra4 24. Ka2 R4a7 25. Bc2 Bd6 26. h4 h6 27.
h5 Kh8 28. g3 f5 29. Kb3 b4 30. axb4 Ra4 31. Bxf5 Rxb4+ 32. Kc3 Rc4+ 33. Kd3
Rb4 34. Rb1 c5 35. dxc5 Be5 36. Rhc1 Kg7 37. Rc2 Ra2 38. f4 Bxb2 39. Ke2 Kf6
40. g4 Rb3 41. Rd2 Rb4 42. Bd3 Rb3 43. g5+ hxg5 44. fxg5+ Kxg5 45. e4 d4 46.
Bc4 Re3+ 47. Kd1 Ra4 48. Bb5 Ra5 49. Rdxb2 Rxe4 50. Rc2 Re5 51. Kd2 Re3 52. Be2
Re5 53. Rbc1 Ra3 54. Rc4 Kh6 55. Bd1 Rd5 56. Be2 Re5 57. Bd1 Rd5 58. Rb4 Ra5
59. Rxb7 Raxc5 60. Rxc5 Rxc5 61. Rxf7 Rd5 62. Rf6+ Kg7 63. Rg6+ Kh8 64. Kd3 Rd8
65. Bf3 Rf8 66. Be4 Rd8 67. Re6 Kg8 68. Bg6 Kh8 69. Ke2 Kg8 70. h6 d3+ 71. Bxd3
Kh8 72. Be4 Rb8 73. Re7 Rd8 74. Kf3 Rb8 75. Kf4 Rd8 76. Kg5 Rd5+ 77. Bf5 Rd8
78. Kg6 Rg8+ 79. Rg7 Re8 80. Rh7+ Kg8 81. Bd7 Re1 82. Rg7+ Kh8 83. Rf7 Rg1+ 84.
Kf6 Rg8 85. Bf5 Rb8 86. Rh7+ Kg8 87. Re7 Kh8 88. Be6 Rf8+ 89. Kg5 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "Johner, Hans"]
[Black "Wolthuis, Wim"]
[Result "0-1"]
[PlyCount "85"]

1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. Nf3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O
O-O 9. Ne2 h6 10. Ng3 Bh7 11. Qe2 Nbd7 12. e4 Qe7 13. Rd1 Rad8 14. Bf4 Nb6 15.
Bb3 c5 16. a5 Nc8 17. h3 cxd4 18. Nxd4 a6 19. e5 Nd5 20. Bd2 Bc5 21. Nf3 Na7
22. Ne4 Bb4 23. Bxd5 Rxd5 24. Bxb4 Rxd1+ 25. Rxd1 Qxb4 26. Nd6 Nc6 27. Rc1 Rb8
28. Rc4 Qxa5 29. Nxb7 Rxb7 30. Rxc6 Qa1+ 31. Kh2 Bg6 32. Rxa6 Qxb2 33. Ra8+ Kh7
34. Qxb2 Rxb2 35. Kg3 Rb5 36. Ra7 Bh5 37. Kf4 g5+ 38. Ke3 Rb3+ 39. Ke4 Bxf3+
40. gxf3 Rb4+ 41. Ke3 Kg6 42. Ra1 Rh4 43. Rh1 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "Kuijpers, Frans"]
[Black "Enevoldsen, Jens"]
[Result "1-0"]
[PlyCount "85"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 c5 6. f3 Nc6 7. e4 e5 8. Ne2
d6 9. d5 Ne7 10. Ng3 h5 11. Bd3 h4 12. Ne2 Ng6 13. Bg5 Qa5 14. O-O Nh5 15. Qd2
f6 16. Be3 Bd7 17. Rab1 O-O-O 18. Rb3 Ba4 19. Rb2 Ngf4 20. Rfb1 Nxe2+ 21. Bxe2
b6 22. Bd1 Bd7 23. a4 g5 24. Ra2 Nf4 25. Rb5 Qa6 26. Rb1 Kc7 27. a5 b5 28. cxb5
Bxb5 29. Rab2 Rb8 30. Bxc5 dxc5 31. c4 Bc6 32. d6+ Kd7 33. Rxb8 Rxb8 34. Rxb8
Qxc4 35. g3 hxg3 36. hxg3 Nd3 37. Qh2 Qd4+ 38. Kh1 Bxe4 39. Qh3+ Kc6 40. Qc8+
Kd5 41. Bb3+ c4 42. Qxc4+ Qxc4 43. Bxc4+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "9"]
[White "Tan, Hiong Liong"]
[Black "Langeweg, Kick"]
[Result "1-0"]
[PlyCount "79"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 Bb4 4. Qb3 Nc6 5. a3 Bxc3 6. Qxc3 a5 7. b3 d6 8. d4
Qe7 9. Bb2 O-O 10. e3 Re8 11. Be2 e5 12. O-O Bg4 13. d5 Nb8 14. b4 Nbd7 15. Qc2
Bh5 16. e4 Nf8 17. h3 Bg6 18. Bd3 Nh5 19. g3 h6 20. Rfe1 Bh7 21. c5 g5 22. Nh2
Ng6 23. Ng4 Kg7 24. Bc3 Nhf4 25. gxf4 gxf4 26. Kh1 Rg8 27. Rg1 Qh4 28. Bf1 Kh8
29. bxa5 Rg7 30. f3 h5 31. Rb1 Ne7 32. Qf2 Qxf2 33. Nxf2 Rxg1+ 34. Kxg1 Nxd5
35. Bd2 Ne3 36. Nd1 f5 37. Bxe3 fxe3 38. exf5 Bxf5 39. Rxb7 Rg8+ 40. Kh2 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "Bernstein, Ossip"]
[Black "Wade, Robert G"]
[Result "0-1"]
[PlyCount "32"]

1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Bc5 5. O-O Nf6 6. e5 d5 7. exf6 dxc4 8.
fxg7 Rg8 9. Re1+ Be6 10. Bg5 Be7 11. Bxe7 Qxe7 12. Nxd4 O-O-O 13. c3 Rxg7 14.
Nxc6 Rxg2+ 15. Kxg2 Qg5+ 16. Kh1 Rxd1 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "De Rooi, Paul"]
[Black "Johner, Hans"]
[Result "0-1"]
[PlyCount "50"]

1. c4 Nf6 2. Nc3 g6 3. d4 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. Bg5 e5 8. dxe5
dxe5 9. Qc2 c6 10. O-O Qe7 11. Rfd1 h6 12. Bd2 Nc5 13. Be1 a5 14. b3 Nh5 15. g3
f5 16. Nh4 Nf4 17. f3 Nxe2+ 18. Nxe2 Kh7 19. a3 fxe4 20. fxe4 Qf6 21. Kh1 Bg4
22. Bc3 Bf3+ 23. Nxf3 Qxf3+ 24. Kg1 Nxe4 25. Rd7 Nf2 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "Enevoldsen, Jens"]
[Black "Tan, Hiong Liong"]
[Result "1-0"]
[PlyCount "59"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 b6 5. Bd3 Bb7 6. Nf3 Ne4 7. Qc2 f5 8. O-O
Bxc3 9. bxc3 O-O 10. Nd2 Nxd2 11. Bxd2 Qh4 12. f3 Nc6 13. e4 fxe4 14. fxe4 d6
15. Be3 Na5 16. c5 dxc5 17. dxc5 Qh5 18. Rae1 Nc6 19. Bc4 Qe5 20. Rf5 Rxf5 21.
exf5 Kh8 22. Bxe6 h6 23. Bf2 Qf6 24. Bd7 Qf7 25. Be6 Qf8 26. Qd3 Re8 27. Qg3
Re7 28. Qg6 Qf6 29. Qxf6 gxf6 30. Bh4 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "Langeweg, Kick"]
[Black "Donner, Jan-Hein"]
[Result "0-1"]
[PlyCount "36"]

1. c4 e5 2. Nc3 Nf6 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nb6 6. d3 Be7 7. f4 exf4 8.
Bxf4 O-O 9. Nf3 Be6 10. O-O c5 11. e4 Nc6 12. Qd2 Qd7 13. Ng5 Bg4 14. h3 Bxg5
15. hxg4 Bxf4 16. gxf4 Qxg4 17. Rf3 Nd4 18. Rf2 Rad8 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "Van den Berg, Carel"]
[Black "Kuijpers, Frans"]
[Result "1-0"]
[PlyCount "49"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8.
O-O-O Bd7 9. f4 Be7 10. Nf3 b5 11. Bxf6 gxf6 12. Qe3 Rc8 13. f5 Qa5 14. Kb1 b4
15. Ne2 Qc7 16. Nf4 Na5 17. Rc1 Rg8 18. Nd2 Qb7 19. Qh3 Rg7 20. Qh6 Rg4 21.
fxe6 Bb5 22. exf7+ Kd7 23. Nd5 Ke6 24. Qxh7 Rg5 25. Nf3 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "10"]
[White "Wolthuis, Wim"]
[Black "Crabbendam, H."]
[Result "0-1"]
[PlyCount "110"]

1. d4 Nf6 2. c4 b6 3. Nc3 Bb7 4. Qc2 g6 5. e4 d6 6. f4 Bg7 7. Nf3 Nbd7 8. Be2
e5 9. fxe5 dxe5 10. dxe5 Ng4 11. e6 Nde5 12. exf7+ Nxf7 13. h3 Nge5 14. Be3 O-O
15. O-O c6 16. c5 b5 17. Rad1 Qe7 18. Rd2 Bc8 19. Rfd1 g5 20. Rf1 g4 21. Nxe5
Nxe5 22. Rxf8+ Bxf8 23. hxg4 Bxg4 24. Bxg4 Nxg4 25. Bd4 h5 26. Nd1 Rd8 27. b4
Bh6 28. Be3 Bxe3+ 29. Nxe3 Nxe3 30. Rxd8+ Qxd8 31. Qb3+ Nc4 32. Qg3+ Kh7 33.
Qf3 Qe8 34. Qf5+ Qg6 35. Qd7+ Kh6 36. Qxa7 Qxe4 37. Qf7 Qe1+ 38. Kh2 Qh4+ 39.
Kg1 Qe1+ 40. Kh2 Qe5+ 41. Kh3 Qe3+ 42. g3 Qg5 43. Qe6+ Qg6 44. Qe7 Qg4+ 45. Kg2
Qf5 46. Qe8 Qf6 47. Qe2 Ne5 48. Qd1 Ng6 49. a4 bxa4 50. Qxa4 h4 51. gxh4 Nxh4+
52. Kg3 Kg5 53. Qc2 Qf4+ 54. Kh3 Qg4+ 55. Kh2 Nf3+ 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Crabbendam, H."]
[Black "De Rooi, Paul"]
[Result "0-1"]
[PlyCount "80"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 a6 6. Nd6+ Bxd6 7. Qxd6 Qf6 8.
Qc7 Nge7 9. Nc3 O-O 10. Be3 d6 11. O-O-O Rd8 12. Bc4 Bg4 13. f3 Rd7 14. Qb6 Nc8
15. Qb3 Na5 16. Qa4 Nxc4 17. Qxc4 Be6 18. Qa4 Qd8 19. b3 Ne7 20. Rd2 b5 21. Qa3
Rc8 22. Ne2 a5 23. Rhd1 b4 24. Qb2 a4 25. Kb1 Qc7 26. f4 f6 27. bxa4 Ra8 28. f5
Bf7 29. a5 Rxa5 30. Nc1 Qc6 31. Nb3 Ra3 32. Kc1 Qxe4 33. Nc5 dxc5 34. Rxd7
Qxe3+ 35. Kb1 Bxa2+ 36. Qxa2+ Rxa2 37. Kxa2 Nxf5 38. g4 Nd4 39. Rd3 b3+ 40. Ka3
bxc2 0-1

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Donner, Jan-Hein"]
[Black "Enevoldsen, Jens"]
[Result "1/2-1/2"]
[PlyCount "120"]

1. d4 Nf6 2. c4 e6 3. Nc3 c5 4. d5 exd5 5. cxd5 d6 6. Nf3 g6 7. Nd2 Bg7 8. Nc4
O-O 9. Bf4 Ne8 10. e3 Na6 11. Be2 Nac7 12. a4 b6 13. O-O Ba6 14. Qd2 Bxc4 15.
Bxc4 a6 16. e4 Rb8 17. Qe2 b5 18. axb5 axb5 19. Nxb5 Nxb5 20. Bxb5 Nc7 21. Bc6
Rxb2 22. Qe3 Bd4 23. Qg3 Ne8 24. Rae1 Qa5 25. Be3 Bxe3 26. Rxe3 Qc7 27. f4 f6
28. h4 Ng7 29. f5 c4 30. Kh2 Nh5 31. Qg4 Kg7 32. Rc3 Qe7 33. Rxc4 Qe5+ 34. Kg1
Ng3 35. Re1 Nxf5 36. Ba4 Qg3 37. Qxg3 Nxg3 38. Bd1 Re8 39. Kh2 Nf5 40. Kh3 Re7
41. Bf3 Nh6 42. Rec1 Rb8 43. Rc7 Rb7 44. R7c6 Nf7 45. Kg3 Ra7 46. R1c3 Ra4 47.
Rc7 Ra7 48. Rxa7 Rxa7 49. Rc6 Re7 50. Kf4 h5 51. Ra6 g5+ 52. hxg5 fxg5+ 53. Ke3
g4 54. Bd1 Rc7 55. Ba4 h4 56. Kf4 h3 57. gxh3 gxh3 58. Bc6 h2 59. Ra1 Ra7 60.
Rh1 Ra2 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Johner, Hans"]
[Black "Bernstein, Ossip"]
[Result "1-0"]
[PlyCount "77"]

1. c4 Nf6 2. d4 e6 3. Nc3 d5 4. Bg5 Be7 5. e3 h6 6. Bf4 c5 7. cxd5 Nxd5 8. Nxd5
Qxd5 9. dxc5 Qxc5 10. Nf3 Qa5+ 11. Nd2 e5 12. Bg3 O-O 13. a3 Rd8 14. Bc4 b5 15.
b4 Qb6 16. Bb3 Nc6 17. Qh5 Be6 18. Bxe6 fxe6 19. Ne4 a5 20. O-O axb4 21. axb4
Ra4 22. Rab1 Rxb4 23. Rxb4 Bxb4 24. Qg4 Kf7 25. h4 Bf8 26. h5 Ne7 27. Bxe5 b4
28. Qf4+ Ke8 29. Bc7 Nd5 30. Bxb6 Nxf4 31. exf4 Rd5 32. g4 b3 33. Nc3 Rd3 34.
Nb1 Kd7 35. Ba5 Rd4 36. Bd2 e5 37. Kg2 exf4 38. Kf3 Bd6 39. Bc3 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Kuijpers, Frans"]
[Black "Wolthuis, Wim"]
[Result "1-0"]
[PlyCount "43"]

1. Nf3 d5 2. g3 Bf5 3. Bg2 e6 4. O-O Nf6 5. d3 h6 6. c4 c6 7. Nbd2 a5 8. cxd5
exd5 9. e4 dxe4 10. dxe4 Be6 11. e5 Nh7 12. Ne4 Qxd1 13. Rxd1 Nd7 14. Be3 O-O-O
15. Nd6+ Bxd6 16. Rxd6 Kc7 17. Nd4 Nxe5 18. Rxe6 fxe6 19. Bf4 Nf6 20. Bxe5+ Kb6
21. Nxe6 Rd2 22. Bd4+ 1-0

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Tan, Hiong Liong"]
[Black "Van den Berg, Carel"]
[Result "1/2-1/2"]
[PlyCount "58"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e6 5. Nb5 d6 6. c4 Nf6 7. N5c3 Be7 8.
Be2 O-O 9. a3 b6 10. O-O Bb7 11. Be3 Rc8 12. Qa4 Qd7 13. Rd1 Rfd8 14. Nd2 Ba8
15. Rac1 Qb7 16. b4 Ne5 17. h3 h6 18. c5 Qb8 19. cxb6 axb6 20. f3 d5 21. exd5
Nxd5 22. Nxd5 Bxd5 23. Qb5 Rxc1 24. Rxc1 Nd7 25. Nc4 Bg5 26. Bxg5 hxg5 27. Rd1
Qc7 28. Ne3 Nf6 29. Nxd5 Nxd5 1/2-1/2

[Event "Amsterdam IBM"]
[Site "Amsterdam IBM"]
[Date "1961.??.??"]
[Round "11"]
[White "Wade, Robert G"]
[Black "Langeweg, Kick"]
[Result "0-1"]
[PlyCount "118"]

1. d4 Nf6 2. c4 d6 3. Nc3 Nbd7 4. e4 e5 5. Be3 Be7 6. h3 O-O 7. Nf3 c6 8. d5
cxd5 9. cxd5 Ne8 10. g4 a6 11. a4 a5 12. Bb5 Nc7 13. Rc1 Na6 14. Nd2 Bg5 15.
Nc4 Bxe3 16. Nxe3 Ndc5 17. Bxa6 bxa6 18. O-O Rb8 19. Rc2 Rb4 20. f3 Bd7 21. Rg2
Qb6 22. Kh1 Rb8 23. Nf5 Bxf5 24. gxf5 Rxb2 25. Rfg1 Rxg2 26. Rxg2 Qd8 27. Qd2
Qh4 28. Kh2 Rb3 29. Rg4 Qd8 30. Rg2 Kf8 31. Rg1 h6 32. Rb1 Rxb1 33. Nxb1 Nxa4
34. f6 Qxf6 35. Qxa5 Nc5 36. Na3 Qf4+ 37. Kg2 Qg5+ 38. Kh2 Qf4+ 39. Kg2 Qg5+
40. Kh2 g6 41. Nc4 Nxe4 42. fxe4 Qf4+ 43. Kg1 Qc1+ 44. Kh2 Qxc4 45. Qd8+ Kg7
46. Qxd6 Qe2+ 47. Kg1 Qe3+ 48. Kh2 Qf4+ 49. Kg1 Qg3+ 50. Kf1 Qxh3+ 51. Ke2 Qg2+
52. Ke3 Qg3+ 53. Kd2 Qf2+ 54. Kc3 Qd4+ 55. Kb3 Qxe4 56. Qd8 Qd3+ 57. Kb2 e4 58.
d6 e3 59. Qe7 e2 0-1

