[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Hort, Vlastimil"]
[Site "Polanica Zdroj"]
[Round "15"]
[Result "0-1"]
[Date "1967.08.30"]
[ECO "B26"]
[PlyCount "74"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 Nf6 2. d3 c5 3. g3 Nc6 4. Bg2 g6 5. Nc3 Bg7 6. Be3 d6 7. h3 0-0 8. Nge2 Nd7 9. 0-0 Nd4 10. Kh2 Rb8 11. Ng1 b5 12. Qd2 b4 13. Nd1 Qa5 14. Bh6 Bxh6 15. Qxh6 Nxc2 16. Nf3 f6 17. Rc1 Nd4 18. Nxd4 cxd4 19. f4 Qh5 20. Qxh5 gxh5 21. Bf3 Nc5 22. Nf2 Be6 23. Bxh5 Bxa2 24. Ra1 b3 25. Rad1 a5 26. Rd2 a4 27. Rc1 a3 28. Nd1 Rfc8 29. Bg4 e6 30. bxa3 h5 31. Rxc5 Rxc5 32. Bxe6+ Kf8 33. Bc4 f5 34. Nb2 Bb1 35. Kg1 fxe4 36. dxe4 Bxe4 37. Rxd4 d5 0-1

[Event "Rubinstein Memorial-05"]
[White "Kostro, Jerzy"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "14"]
[Result "1-0"]
[Date "1967.08.28"]
[ECO "C14"]
[PlyCount "67"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Ne4 6. Bxe7 Nxc3 7. Bxd8 Nxd1 8. Rxd1 Kxd8 9. Bd3 b6 10. c3 Ba6 11. Bb1 c5 12. f4 g6 13. Nf3 Nc6 14. Kf2 Rc8 15. g4 cxd4 16. cxd4 Rc7 17. h3 Ke7 18. Rc1 Rhc8 19. h4 Bc4 20. Ke3 a5 21. h5 a4 22. hxg6 hxg6 23. Rh7 a3 24. bxa3 Ra7 25. Bxg6 Rxa3+ 26. Kf2 Rxa2+ 27. Kg3 Nd8 28. f5 exf5 29. gxf5 Kf8 30. Rh8+ Ke7 31. f6+ Kd7 32. Bf5+ Kc7 33. Bxc8 Kxc8 34. e6 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Liebert, Heinz"]
[Site "Polanica Zdroj"]
[Round "13"]
[Result "0-1"]
[Date "1967.08.27"]
[ECO "B24"]
[PlyCount "112"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. g3 Nc6 3. Bg2 g6 4. d3 Bg7 5. Ne2 e6 6. 0-0 Nge7 7. Nbc3 0-0 8. Be3 Nd4 9. Kh1 d6 10. Ng1 Bd7 11. Qd2 b5 12. Nd1 b4 13. c3 bxc3 14. bxc3 Ndc6 15. Bh6 Qa5 16. Bxg7 Kxg7 17. Ne3 Rab8 18. Nh3 e5 19. f4 f6 20. f5 Ng8 21. fxg6 hxg6 22. Rab1 Be6 23. Nc4 Qc7 24. Nf2 Na5 25. Ne3 Rxb1 26. Rxb1 Rb8 27. Qc2 Nc6 28. Bh3 Bf7 29. Nfd1 Nge7 30. Bg2 Rb7 31. a3 Qb8 32. Rxb7 Qxb7 33. Qb2 Qa6 34. Bf1 Qa4 35. Be2 Bb3 36. Nf2 Be6 37. Kg1 Qa5 38. h3 Qc7 39. Kh2 Na5 40. Kg2 d5 41. exd5 Nxd5 42. Nxd5 Bxd5+ 43. Bf3 Bxf3+ 44. Kxf3 c4 45. Ke2 cxd3+ 46. Nxd3 e4 47. Nf4 Qc4+ 48. Kf2 g5 49. Ne2 Nb3 50. Qb1 Qd5 51. Qc2 Qf5+ 52. Ke1 Nc5 53. Kd2 e3+ 54. Kc1 Nd3+ 55. Kb1 Qf1+ 56. Nc1 Nxc1 0-1

[Event "Rubinstein Memorial-05"]
[White "Schmidt, Wlodzimierz"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "12"]
[Result "1-0"]
[Date "1967.08.25"]
[ECO "B07"]
[PlyCount "83"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. dxe5 dxe5 5. Qxd8+ Kxd8 6. Bc4 Be6 7. Bxe6 fxe6 8. f3 Nc6 9. Be3 Bd6 10. 0-0-0 Ke7 11. Nge2 Rhd8 12. Na4 b6 13. c3 Ke8 14. Kc2 Be7 15. b4 Rxd1 16. Rxd1 Rd8 17. Rxd8+ Kxd8 18. Nc1 b5 19. Nb2 a5 20. a3 axb4 21. axb4 Nb8 22. Ncd3 Nbd7 23. c4 c6 24. Kb3 Kc7 25. Nd1 Bd6 26. Nc3 bxc4+ 27. Kxc4 Nb6+ 28. Kb3 Nbd7 29. Na4 Kd8 30. Nab2 Kc8 31. Nc4 Bc7 32. Bd2 h5 33. Bc3 g5 34. Ncxe5 Nxe5 35. Bxe5 Bxe5 36. Nxe5 Kc7 37. Kc4 g4 38. Kc5 gxf3 39. gxf3 h4 40. Nxc6 Nd7+ 41. Kb5 h3 42. e5 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Sliwa, Bogdan Stanislaw"]
[Site "Polanica Zdroj"]
[Round "11"]
[Result "0-1"]
[Date "1967.08.24"]
[ECO "C68"]
[PlyCount "68"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. Nc3 f6 6. d3 Bg4 7. h3 Bh5 8. Be3 Ne7 9. Qe2 Qd6 10. 0-0-0 c5 11. g4 Bf7 12. Nh4 0-0-0 13. Rdf1 Qb6 14. f4 exf4 15. Bg1 g5 16. Nf3 h5 17. gxh5 Bxh5 18. Qf2 Ng6 19. Nd2 Ne5 20. Kb1 Qc6 21. a4 b6 22. a5 b5 23. b4 cxb4 24. Nd5 Bf7 25. Qa7 Bxd5 26. exd5 Rxd5 27. Ne4 Be7 28. Rc1 Qb7 29. c4 bxc3 30. Rxc3 Qxa7 31. Bxa7 Rxd3 32. Rhc1 Rxc3 33. Rxc3 f3 34. Bb6 Nc4 0-1

[Event "Rubinstein Memorial-05"]
[White "Kolarov, Atanas Stefanov"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "10"]
[Result "1-0"]
[Date "1967.08.22"]
[ECO "E94"]
[PlyCount "95"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. Nc3 0-0 5. e4 d6 6. Be2 e5 7. 0-0 c6 8. Re1 Qb6 9. d5 c5 10. g3 Nbd7 11. Nh4 Qd8 12. Be3 Ne8 13. Bd3 Nc7 14. Qd2 Re8 15. a3 Nf6 16. Bg5 Qe7 17. b4 Na6 18. Rab1 Qf8 19. f3 Nd7 20. Nb5 h6 21. Be3 Rd8 22. Kh1 Kh7 23. f4 b6 24. Nf3 f6 25. Nh4 Qe7 26. f5 Nf8 27. fxg6+ Nxg6 28. Nf5 Bxf5 29. exf5 Nh8 30. Nc3 Nf7 31. Ne4 Rh8 32. g4 Kg8 33. h4 Kf8 34. Re2 Ke8 35. Bc2 Rc8 36. Ba4+ Kd8 37. Bb5 Nb8 38. Qd3 Qc7 39. bxc5 dxc5 40. d6 Qb7 41. Kg1 Nd7 42. a4 h5 43. g5 a6 44. Bxd7 Qxd7 45. Rxb6 Qxf5 46. Rb7 Rf8 47. Nxc5 e4 48. Ne6+ 1-0

[Event "Rubinstein Memorial-05"]
[White "Furman, Semen Abramovich"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "9"]
[Result "1-0"]
[Date "1967.08.21"]
[ECO "E62"]
[PlyCount "65"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 Nc6 5. d5 Ne7 6. g3 g6 7. Bg2 Bg7 8. e4 0-0 9. 0-0 h6 10. Ne1 Nd7 11. Nd3 Kh7 12. Be3 f5 13. Qd2 fxe4 14. Nxe4 Nf5 15. c5 Nf6 16. Nxf6+ Bxf6 17. Rac1 Rf7 18. Be4 Bg5 19. Bxg5 hxg5 20. f3 Nd4 21. Kg2 b6 22. cxd6 cxd6 23. Nb4 Bb7 24. h4 gxh4 25. Rh1 Nf5 26. Bxf5 Rxf5 27. Rxh4+ Rh5 28. Rch1 Qf6 29. Rxh5+ gxh5 30. Rxh5+ Kg7 31. Qc2 e4 32. Qxe4 Qxb2+ 33. Kh3 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Adamski, Jan"]
[Site "Polanica Zdroj"]
[Round "8"]
[Result "0-1"]
[Date "1967.08.19"]
[ECO "B20"]
[PlyCount "84"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. g3 g6 3. Bg2 Bg7 4. Ne2 Nc6 5. 0-0 d6 6. d3 e5 7. c3 Nge7 8. Be3 0-0 9. Na3 b6 10. Qd2 d5 11. exd5 Nxd5 12. Bh6 Bxh6 13. Qxh6 Be6 14. f4 Rc8 15. Nc4 Nde7 16. fxe5 Qxd3 17. Nd6 Nf5 18. Nxf5 Bxf5 19. Rae1 Ne7 20. Nf4 Qd7 21. Rd1 Qc7 22. Rd6 c4 23. Kh1 Rfd8 24. h3 Bd3 25. Nxd3 cxd3 26. Rf4 d2 27. Rfd4 Nf5 28. Qxd2 Nxd4 29. Qxd4 Rxd6 30. exd6 Qd7 31. c4 Rd8 32. c5 bxc5 33. Qxc5 a6 34. h4 Qxd6 35. Qg5 Qd2 36. Qf6 Rd6 37. Qe5 Re6 38. Qb8+ Kg7 39. h5 Qd1+ 40. Kh2 Qxh5+ 41. Kg1 Re1+ 42. Bf1 Qf3 0-1

[Event "Rubinstein Memorial-05"]
[White "Flohr, Salo"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "7"]
[Result "1-0"]
[Date "1967.08.18"]
[ECO "E60"]
[PlyCount "67"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. c4 d6 3. d4 g6 4. b3 Bg7 5. Bb2 0-0 6. e3 e5 7. dxe5 Ng4 8. Nc3 Nxe5 9. Be2 Nbc6 10. 0-0 Bf5 11. Qd2 Qd7 12. Nd5 Nxf3+ 13. Bxf3 Ne5 14. Be2 c6 15. Nc3 f6 16. e4 Be6 17. f4 Nf7 18. h3 Rad8 19. Bf3 Rfe8 20. Rae1 Qc7 21. Kh1 Bc8 22. Nd1 Nh6 23. g4 Nf7 24. Qf2 a6 25. Bg2 Rd7 26. Bd4 Qd8 27. Qb2 Nh8 28. Ne3 b5 29. Qa1 Bb7 30. g5 fxg5 31. Ng4 Ree7 32. fxg5 Bxd4 33. Qxd4 Rf7 34. Nh6+ 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Doda, Zbigniew"]
[Site "Polanica Zdroj"]
[Round "6"]
[Result "0-1"]
[Date "1967.08.17"]
[ECO "E70"]
[PlyCount "78"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 c5 3. d5 g6 4. Nc3 d6 5. e4 Bg7 6. Bd3 0-0 7. Nge2 e5 8. f3 Nh5 9. Be3 Nd7 10. Qc2 Bf6 11. Qd2 Bg7 12. 0-0 b6 13. Rab1 a6 14. a3 Ra7 15. b4 f5 16. exf5 gxf5 17. Qc2 e4 18. fxe4 Ne5 19. exf5 Ng4 20. Bf4 Nxf4 21. Rxf4 Ne3 22. Qd2 Nxf5 23. Rbf1 Raf7 24. g4 Nh6 25. Qc2 Qh4 26. Bxh7+ Kh8 27. Bf5 Bxf5 28. gxf5 Ng4 29. Ng3 Bd4+ 30. Rxd4 cxd4 31. Nce4 Ne3 32. Qd3 Nxf1 33. Qxf1 Qh6 34. Qd3 Rxf5 35. Nxf5 Rxf5 36. Qxd4+ Kg8 37. Ng3 Rf7 38. Qxb6 Qc1+ 39. Kg2 Qd2+ 0-1

[Event "Rubinstein Memorial-05"]
[White "Uhlmann, Wolfgang"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "5"]
[Result "1-0"]
[Date "1967.08.15"]
[ECO "A53"]
[PlyCount "53"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 c6 4. e4 e5 5. Nf3 Bg4 6. Be2 Nbd7 7. Be3 Be7 8. 0-0 0-0 9. d5 Bxf3 10. Bxf3 c5 11. g3 Ne8 12. Bg4 g6 13. f4 exf4 14. gxf4 f5 15. exf5 gxf5 16. Bh3 Ng7 17. Kh1 Rf6 18. Rg1 Rg6 19. Qd3 Qf8 20. Bd2 Qf7 21. Nb5 Nf8 22. Bc3 a6 23. Nc7 Rc8 24. Ne6 Bf6 25. Nxg7 Rxg7 26. Qxf5 Bxc3 27. Qxc8 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Suttles, Duncan"]
[Site "Polanica Zdroj"]
[Round "4"]
[Result "0-1"]
[Date "1967.08.14"]
[ECO "B07"]
[PlyCount "80"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 g6 2. e4 Bg7 3. f4 c5 4. d5 d6 5. Nf3 Nf6 6. c3 0-0 7. Bd3 e6 8. dxe6 Bxe6 9. 0-0 Nc6 10. Nbd2 Qb6 11. Kh1 Rae8 12. Qc2 d5 13. exd5 Bxd5 14. Nc4 Bxc4 15. Bxc4 Na5 16. Ne5 Nxc4 17. Nxc4 Qa6 18. b3 Nd5 19. Bd2 b5 20. Ne5 Nxf4 21. Ng4 Re2 22. Rxf4 Rd8 23. Rd1 Qd6 24. Rff1 Rxd2 25. Rxd2 Qxd2 26. Qe4 Qd3 27. Qf4 f5 28. Ne3 Re8 29. Rf3 Be5 30. Qg5 Bxc3 31. Nf1 Re1 32. Qf4 Be5 33. Rxd3 Bxf4 34. Rd8+ Kf7 35. g3 Rxf1+ 36. Kg2 Ra1 37. gxf4 Rxa2+ 38. Kg3 Ra3 39. Rd7+ Kf6 40. Rxh7 Rxb3+ 0-1

[Event "Rubinstein Memorial-05"]
[White "Filipowicz, Andrzej"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "3"]
[Result "1-0"]
[Date "1967.08.12"]
[ECO "B88"]
[PlyCount "63"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d6 5. Nc3 e6 6. Be3 Be7 7. Bc4 Nf6 8. Bb3 Nxd4 9. Qxd4 Bd7 10. f3 Bc6 11. 0-0-0 0-0 12. h4 Qc8 13. g4 Rd8 14. g5 Nh5 15. f4 b5 16. Rhf1 a5 17. a3 b4 18. axb4 d5 19. b5 dxe4 20. Qe5 Bb7 21. f5 Qb8 22. Rxd8+ Qxd8 23. fxe6 f6 24. gxf6 Nxf6 25. Rg1 Kh8 26. h5 h6 27. Rg6 Bd6 28. Qf5 Ne8 29. Rxh6+ gxh6 30. Bd4+ Ng7 31. Bxg7+ Kxg7 32. Qg6+ 1-0

[Event "Rubinstein Memorial-05"]
[White "Orbaan, Constant"]
[Black "Ortega, Rogelio"]
[Site "Polanica Zdroj"]
[Round "2"]
[Result "1-0"]
[Date "1967.08.11"]
[ECO "B12"]
[PlyCount "117"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d6 3. Nf3 Nf6 4. Nbd2 Qc7 5. Be2 e5 6. 0-0 Bg4 7. c3 Nbd7 8. b3 Be7 9. Ba3 0-0 10. dxe5 Nxe5 11. Nd4 c5 12. Nc2 Bd7 13. c4 Bc6 14. f4 Ng6 15. Bd3 Rfe8 16. Ne3 b5 17. cxb5 Bb7 18. Qc2 Nh5 19. g3 Bf6 20. Bb2 Bxb2 21. Qxb2 d5 22. Nxd5 Bxd5 23. exd5 Qd7 24. Bc4 Qg4 25. Qc3 Nhxf4 26. Qf3 Ne2+ 27. Bxe2 Qd4+ 28. Qf2 Qxd2 29. Bc4 Qg5 30. Rfe1 Rxe1+ 31. Rxe1 Ne5 32. Qe3 Qxe3+ 33. Rxe3 f6 34. h3 Rd8 35. Kf2 Kf7 36. Ke2 Ke7 37. Kd1 Kd6 38. Kc2 Re8 39. Re1 Re7 40. Re2 Re8 41. a4 Re7 42. Re1 Re8 43. Re2 Re7 44. a5 Rb7 45. Kb2 Rb8 46. Ka3 Kc7 47. Ka4 Ra8 48. Re1 Kd6 49. b6 axb6 50. a6 Kc7 51. Kb5 Rd8 52. h4 Rd6 53. a7 Kb7 54. Ra1 Ka8 55. Ka6 h5 56. Ra2 g6 57. Bb5 g5 58. hxg5 fxg5 59. Re2 1-0

[Event "Rubinstein Memorial-05"]
[White "Witkowski, Stefan"]
[Black "Orbaan, Constant"]
[Site "Polanica Zdroj"]
[Round "1"]
[Result "1-0"]
[Date "1967.08.10"]
[ECO "C10"]
[PlyCount "77"]
[EventDate "1967.08.10"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Nxf6+ Nxf6 7. Bg5 Be7 8. Bc4 0-0 9. Qe2 b6 10. 0-0-0 Bb7 11. Kb1 a6 12. Ne5 b5 13. Bd3 Qc8 14. h4 Rd8 15. Rhe1 Rd6 16. g4 Qe8 17. c3 Rb6 18. Bc2 Bd5 19. Qd3 g6 20. Qh3 Nd7 21. Bxe7 Qxe7 22. Nxd7 Qxd7 23. Bd3 Rab8 24. h5 a5 25. f4 Bxa2+ 26. Kxa2 b4 27. hxg6 fxg6 28. c4 b3+ 29. Kb1 Qa4 30. Kc1 Rc6 31. Rh1 Qa1+ 32. Kd2 Qxb2+ 33. Ke3 h5 34. gxh5 Rd8 35. Be4 Rcd6 36. hxg6 Kf8 37. Qh8+ Ke7 38. Qg7+ Ke8 39. Qf7# 1-0

[Event "Match/Nation GER-NED"]
[White "Orbaan, Constant"]
[Black "Degenhardt, Norbert"]
[Site "Krefeld"]
[Round "2.8"]
[Result "1/2-1/2"]
[Date "1967.04.30"]
[ECO "B26"]
[PlyCount "67"]
[EventDate "1967.04.29"]
[EventType "team"]
[EventRounds "2"]
[EventCountry "GER"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. g3 Nc6 3. Bg2 Nf6 4. Nc3 g6 5. d3 Bg7 6. Nge2 d6 7. 0-0 0-0 8. h3 Bd7 9. Be3 Rb8 10. Qd2 b5 11. Bh6 b4 12. Bxg7 Kxg7 13. Nd1 Nd4 14. Kh2 e5 15. Ne3 Ng8 16. f4 f6 17. Rf2 Rb6 18. Raf1 Nxe2 19. Qxe2 Bb5 20. Bf3 Ra6 21. Bg4 Re8 22. c4 Bd7 23. b3 Rf8 24. h4 Rc6 25. Bxd7 Qxd7 26. f5 Rcc8 27. fxg6 hxg6 28. h5 Ne7 29. h6+ Kxh6 30. Rxf6 Rxf6 31. Rxf6 Kg7 32. Qg4 Qxg4 33. Nxg4 Rc6 34. Rf2 1/2-1/2

[Event "Eersel Agio-04 +"]
[White "Bouwmeester, Hans"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "2"]
[Result "1/2-1/2"]
[Date "1967.01.??"]
[ECO "A53"]
[PlyCount "62"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "3"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 c6 4. Nf3 Bg4 5. e4 e5 6. Be2 Nbd7 7. 0-0 Be7 8. Be3 0-0 9. Qc2 Qc7 10. h3 Bh5 11. Rfd1 Rfe8 12. d5 Nb6 13. Qd3 cxd5 14. cxd5 Rec8 15. g4 Bg6 16. Nh4 Nfd7 17. Nf5 Bxf5 18. exf5 Nc5 19. Qd2 Qd8 20. Rac1 Nba4 21. Nxa4 Nxa4 22. Rxc8 Rxc8 23. Rc1 Rxc1+ 24. Qxc1 Nb6 25. Qd2 h6 26. Qa5 Bg5 27. Qxa7 Bxe3 28. fxe3 Qc7 29. Kf2 Nxd5 30. Qa8+ Kh7 31. Qa4 Nb6 1/2-1/2

[Event "Eersel Agio-04"]
[White "Cornelis, Frans B"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "4"]
[Result "1-0"]
[Date "1967.01.??"]
[ECO "C02"]
[PlyCount "75"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 f5 6. Bd3 Bd7 7. 0-0 Qb6 8. dxc5 Bxc5 9. b4 Be7 10. a4 a5 11. b5 Nd8 12. c4 dxc4 13. Bxc4 Qc7 14. Bb3 Rc8 15. Na3 b6 16. Nc4 Nb7 17. Be3 Bc5 18. Rc1 Rd8 19. Nd4 Bc8 20. Qh5+ g6 21. Qh4 Be7 22. Qh3 Nc5 23. Nc6 Rd3 24. Bc2 Rc3 25. Nd6+ Bxd6 26. exd6 Qg7 27. Qh4 Nf6 28. Bd4 g5 29. Bxf6 Qxf6 30. Qh5+ Kd7 31. Rfd1 Bb7 32. Ne5+ Kc8 33. d7+ Kb8 34. Qe8+ Ka7 35. Nc6+ Bxc6 36. bxc6 Na6 37. Qc8 Rd8 38. Qb7# 1-0

[Event "Eersel Agio-04"]
[White "Limbos, Paul"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "7"]
[Result "1-0"]
[Date "1967.01.??"]
[ECO "B28"]
[PlyCount "92"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 a6 3. c3 d5 4. exd5 Qxd5 5. d4 e6 6. Be3 cxd4 7. cxd4 Nf6 8. Nc3 Qd8 9. Ne5 Be7 10. Be2 Nbd7 11. 0-0 Nb6 12. Bf3 Nbd5 13. Qa4+ Kf8 14. Rad1 h6 15. Bc1 g6 16. Rfe1 Kg7 17. Qb3 Qd6 18. g3 b5 19. Bf4 Qb4 20. Nxd5 Qxb3 21. axb3 Nxd5 22. Bxd5 exd5 23. Nxg6 Kxg6 24. Rxe7 Be6 25. Rc1 Rhc8 26. Rcc7 Rxc7 27. Rxc7 Rc8 28. Rc5 Rxc5 29. dxc5 d4 30. b4 Bd5 31. Kf1 h5 32. Ke2 Be4 33. f3 Bc6 34. g4 d3+ 35. Kf2 f5 36. gxh5+ Kxh5 37. Kg3 Kg6 38. h4 Kh5 39. Bd2 Kg6 40. Kf4 Kh5 41. Be1 Kg6 42. Ke3 Kf6 43. Kxd3 Bxf3 44. Bg3 Ke6 45. Kd2 Kf6 46. Bf4 Ke6 1-0

[Event "Eersel Agio-04"]
[White "Orbaan, Constant"]
[Black "Littlewood, Norman"]
[Site "Eersel"]
[Round "5"]
[Result "1-0"]
[Date "1967.01.??"]
[ECO "B52"]
[PlyCount "71"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. 0-0 e6 6. Re1 Be7 7. c3 Nc6 8. d3 Nf6 9. Nbd2 h6 10. Nf1 g5 11. d4 g4 12. d5 Nd8 13. N3d2 b6 14. Nc4 Nb7 15. a4 h5 16. Qd3 Rg8 17. Nfe3 h4 18. e5 Nxd5 19. Nxd5 exd5 20. Qxd5 0-0-0 21. Bf4 Bg5 22. Nxd6+ Kb8 23. Bxg5 Rxg5 24. Rad1 Rg6 25. Qxb7+ Qxb7 26. Nxb7 Rxd1 27. Rxd1 Kxb7 28. Rd7+ Ka6 29. Rxf7 Re6 30. Rf5 Ka5 31. f4 Kxa4 32. Rf6 Re8 33. e6 Kb3 34. f5 Kc4 35. Rf7 a5 36. e7 1-0

[Event "Eersel Agio-04"]
[White "Orbaan, Constant"]
[Black "Rellstab, Ludwig Sr"]
[Site "Eersel"]
[Round "3"]
[Result "1/2-1/2"]
[Date "1967.01.??"]
[ECO "B26"]
[PlyCount "47"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 d6 2. g3 c5 3. Bg2 Nc6 4. d3 g6 5. Be3 Bg7 6. Qc1 e6 7. Nc3 Nd4 8. Nd1 Rb8 9. f4 Ne7 10. Nf2 0-0 11. c3 Ndc6 12. Nf3 b6 13. 0-0 Ba6 14. Rd1 Rc8 15. Bh3 d5 16. f5 exf5 17. Bh6 Qd6 18. Bxg7 Kxg7 19. exf5 Nxf5 20. Bxf5 gxf5 21. Nh4 Kh8 22. Nxf5 Qe5 23. Qf4 Qxf4 24. gxf4 1/2-1/2

[Event "Eersel Agio-04"]
[White "Orbaan, Constant"]
[Black "Stumpers, Louis F"]
[Site "Eersel"]
[Round "1"]
[Result "1-0"]
[Date "1967.01.??"]
[ECO "B24"]
[PlyCount "80"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Rb8 6. Be3 Nd4 7. Nce2 e5 8. c3 Ne6 9. Nf3 Ne7 10. Qd2 d5 11. exd5 Nxd5 12. Bh6 f6 13. Bxg7 Nxg7 14. 0-0 0-0 15. d4 cxd4 16. cxd4 e4 17. Ne1 f5 18. Nc2 b6 19. Ne3 Bb7 20. Rac1 Ne6 21. Rfd1 Qd7 22. h4 Rbd8 23. Bf1 Nf6 24. Ng2 Ba6 25. Ngf4 Nxf4 26. Nxf4 Bxf1 27. Kxf1 Rfe8 28. d5 Ng4 29. d6 Qb5+ 30. Qe2 Qxe2+ 31. Kxe2 Ne5 32. Rc7 Nd3 33. d7 Re7 34. Rxa7 Kf7 35. Nxd3 exd3+ 36. Kxd3 Rdxd7+ 37. Rxd7 Rxd7+ 38. Kc2 Rc7+ 39. Kb3 Ke6 40. a4 Ke5 1-0

[Event "Eersel Agio-04"]
[White "Saemisch, Friedrich"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "6"]
[Result "1/2-1/2"]
[Date "1967.01.??"]
[ECO "C62"]
[PlyCount "37"]
[EventDate "1967.01.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. Bxc6+ bxc6 5. d4 f6 6. c4 Ne7 7. Nc3 Ng6 8. Be3 Be7 9. h3 Bd7 10. Qe2 Qc8 11. 0-0-0 Qa6 12. d5 c5 13. Nd2 Rb8 14. g4 Nh4 15. Ndb1 g5 16. Na3 Kf7 17. Rd3 Qc8 18. Kc2 Kg7 19. Bc1 1/2-1/2

[Event "Eersel Agio-03"]
[White "Ivkov, Borislav"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "5"]
[Result "0-1"]
[Date "1966.02.05"]
[ECO "A53"]
[PlyCount "59"]
[EventDate "1966.01.31"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nf3 Bg4 4. Qb3 Qc8 5. h3 Bxf3 6. Qxf3 g6 7. Bg5 Bg7 8. Nc3 Nbd7 9. e3 c6 10. Be2 0-0 11. 0-0 Qc7 12. Rfd1 Rfe8 13. e4 c5 14. d5 a6 15. Qd3 e6 16. dxe6 Rxe6 17. f4 Rae8 18. Bf3 b5 19. Kh1 bxc4 20. Qxc4 h6 21. Bh4 Nb6 22. Qxa6 d5 23. Bxf6 Rxf6 24. exd5 Rxf4 25. d6 Qd7 26. Qb7 Qf5 27. d7 Nxd7 28. Bc6 Ne5 29. Bxe8 Nd3 30. Qxf7+ 0-1

[Event "Eersel Agio-03"]
[White "Orbaan, Constant"]
[Black "Czerniak, Moshe"]
[Site "Eersel"]
[Round "4"]
[Result "1/2-1/2"]
[Date "1966.02.03"]
[ECO "E70"]
[PlyCount "227"]
[EventDate "1966.01.31"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 c5 4. d5 d6 5. e4 Bg7 6. Bd3 e5 7. Nge2 0-0 8. Bg5 h6 9. Bh4 Nbd7 10. f3 a6 11. g4 Rb8 12. a4 Re8 13. Bf2 Nh7 14. h4 Ndf8 15. Qd2 Bd7 16. Ng3 Qf6 17. Ke2 Qd8 18. Rh2 Qa5 19. Rah1 b5 20. axb5 axb5 21. Nxb5 Qxd2+ 22. Kxd2 Bxb5 23. cxb5 Nd7 24. Ra1 Nb6 25. b3 Nf8 26. Rhh1 Nfd7 27. Ra6 Kf8 28. h5 Ke7 29. Be3 Rh8 30. g5 hxg5 31. Bxg5+ Bf6 32. Be3 Kd8 33. hxg6 Rxh1 34. Nxh1 fxg6 35. Nf2 Kc7 36. Nd1 Rh8 37. Nb2 Rh2+ 38. Be2 Kb7 39. Na4 Nc8 40. Nb2 Ndb6 41. Na4 Nd7 42. Nc3 Ncb6 43. Ra1 Nc8 44. Rg1 Bd8 45. Na4 Ne7 46. Bg5 Ba5+ 47. Kd1 Nc8 48. Nb2 Bc3 49. Nc4 Kc7 50. b6+ Ndxb6 51. Nxb6 Nxb6 52. Be3 Bd4 53. Bxd4 cxd4 54. Rxg6 Nd7 55. Rg7 Kd8 56. Bb5 Nc5 57. b4 Nb3 58. Ba4 Nd2 59. Rd7+ Kc8 60. Rxd6 Nb1 61. Rc6+ Kd8 62. Bc2 Nc3+ 63. Kc1 Na2+ 64. Kb1 Nxb4 65. Rc4 Nxc2 66. Rxc2 Rh1+ 67. Rc1 Rh3 68. Rf1 Rh2 69. Kc1 Ke7 70. Kd1 Kd6 71. Ke1 Ra2 72. Rf2 Ra1+ 73. Ke2 Kc5 74. Rg2 Ra2+ 75. Kf1 Ra1+ 76. Kf2 Ra2+ 77. Kg3 Ra8 78. Rc2+ Kb4 79. Kf2 Ra3 80. d6 Ra6 81. d7 Rd6 82. Rc7 d3 83. Ke1 d2+ 84. Kd1 Rd4 85. Rc2 Rxd7 86. Rxd2 Rh7 87. Ke2 Rh5 88. Rd5 Kc4 89. Ke3 Rg5 90. Kf2 Kb4 91. Rd1 Kc5 92. Rg1 Rh5 93. Rg6 Kd4 94. Rd6+ Kc4 95. Kg3 Rg5+ 96. Kh4 Rg8 97. Rd5 Re8 98. Kg4 Rg8+ 99. Kf5 Rf8+ 100. Kxe5 Rxf3 101. Rd1 Rf8 102. Rd6 Rh8 103. Rc6+ Kd3 104. Re6 Rh5+ 105. Kd6 Ra5 106. Ke7 Ra1 107. e5 Ke4 108. Kf7 Kd5 109. Re7 Rf1+ 110. Ke8 Re1 111. Rd7+ Kc6 112. Re7 Kd5 113. Kd7 Rxe5 114. Rxe5+ 1/2-1/2

[Event "Eersel Agio-03"]
[White "Limbos, Paul"]
[Black "Orbaan, Constant"]
[Site "Eersel"]
[Round "3"]
[Result "1-0"]
[Date "1966.02.02"]
[ECO "C13"]
[PlyCount "105"]
[EventDate "1966.01.31"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 Bd7 8. Bd3 Bc6 9. c3 Bxe4 10. Bxe4 c6 11. Qc2 h6 12. 0-0 Nd7 13. Rfe1 Qc7 14. c4 0-0 15. Rad1 Nb6 16. b3 Rad8 17. Re2 Rd7 18. g3 Rfd8 19. Red2 g5 20. c5 Nd5 21. h3 Kf8 22. Kg2 Ke7 23. a3 h5 24. b4 h4 25. Bxd5 Rxd5 26. Qe4 hxg3 27. fxg3 Kd7 28. Ne5+ Kc8 29. Nc4 Kb8 30. Nd6 Rf8 31. Rf2 Bg7 32. Rd3 Qd7 33. a4 a6 34. Rb2 f5 35. Qe3 f4 36. Qe4 fxg3 37. Kxg3 e5 38. b5 axb5 39. axb5 Rf4 40. Qh7 Rxd6 41. cxd6 cxb5 42. Qg8+ Rf8 43. Qd5 exd4 44. Rxb5 Re8 45. Rdb3 Re3+ 46. Rxe3 dxe3 47. Qg8+ Ka7 48. Ra5+ Kb6 49. Qd5 Bd4 50. Ra3 Qg7 51. Rb3+ Ka6 52. Qb5+ Ka7 53. Qa4+ 1-0

[Event "Eersel Agio-03"]
[White "Orbaan, Constant"]
[Black "Sandor, Bela"]
[Site "Eersel"]
[Round "2"]
[Result "0-1"]
[Date "1966.02.01"]
[ECO "B08"]
[PlyCount "74"]
[EventDate "1966.01.31"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 g6 4. Nf3 Bg7 5. h3 0-0 6. Be3 c6 7. Bd3 Nbd7 8. 0-0 e5 9. dxe5 dxe5 10. Nd2 Qe7 11. Nb3 a5 12. a4 Ne8 13. Qd2 Nc7 14. Rfd1 Re8 15. Nb1 Ne6 16. Nxa5 Nf4 17. Bf1 Nf6 18. f3 Bxh3 19. Nb3 Red8 20. Qe1 Rxd1 21. Qxd1 Be6 22. Bc5 Qe8 23. N1d2 N6h5 24. Nc4 Ng3 25. a5 Bf8 26. Qe1 Bxc4 27. Bxc4 Bxc5+ 28. Nxc5 Qe7 29. Nd3 Nfe2+ 30. Kf2 Qd6 31. c3 Qe7 32. b4 Qh4 33. Nxe5 Nf4 34. Qd1 Nxe4+ 35. Ke3 Nxg2+ 36. Ke2 Qf2+ 37. Kd3 Rd8+ 0-1

[Event "Eersel Agio-03"]
[White "Orbaan, Constant"]
[Black "Golombek, Harry"]
[Site "Eersel"]
[Round "1"]
[Result "1/2-1/2"]
[Date "1966.01.31"]
[ECO "B18"]
[PlyCount "46"]
[EventDate "1966.01.31"]
[EventType "tourn"]
[EventRounds "5"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. Bd3 e6 8. 0-0 Ngf6 9. b3 Be7 10. Bb2 0-0 11. Bxg6 hxg6 12. Qd2 c5 13. Rad1 Qc7 14. c4 Rad8 15. Qe2 Rfe8 16. Bc3 b6 17. Rfe1 Bd6 18. Ne4 Nxe4 19. Qxe4 Be7 20. Rd3 cxd4 21. Bxd4 Nc5 22. Bxc5 bxc5 23. Red1 Rxd3 1/2-1/2

[Event "IBM-B"]
[White "Hartoch, Robert G"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "1"]
[Result "1/2-1/2"]
[Date "1965.??.??"]
[ECO "B50"]
[PlyCount "47"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. c3 Nf6 4. Qc2 e6 5. d4 Nc6 6. Bb5 Bd7 7. dxc5 dxc5 8. 0-0 Be7 9. Nbd2 0-0 10. Bd3 Qc7 11. Re1 Ng4 12. h3 Nge5 13. Nxe5 Nxe5 14. Bf1 Rad8 15. f4 Ng6 16. g3 Bc6 17. Nc4 b5 18. Ne3 c4 19. Ng2 Qb7 20. b3 Bc5+ 21. Kh2 cxb3 22. axb3 Rd7 23. Qe2 Rfd8 24. Be3 1/2-1/2

[Event "IBM-B"]
[White "Karper, Jacob G"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "9"]
[Result "0-1"]
[Date "1965.??.??"]
[ECO "A54"]
[PlyCount "70"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. Nf3 Nc6 5. dxe5 Nxe5 6. Nxe5 dxe5 7. Qxd8+ Kxd8 8. Bg5 c6 9. 0-0-0+ Kc7 10. Bh4 Bb4 11. Bg3 Bxc3 12. bxc3 Re8 13. f3 Nd7 14. e4 f6 15. Kc2 Nf8 16. Bf2 Be6 17. a3 Nd7 18. c5 b6 19. cxb6+ axb6 20. Ra1 Ra5 21. Bd3 b5 22. Rhb1 Rea8 23. Kb2 c5 24. a4 bxa4 25. Ka3 Bb3 26. Rb2 Nb6 27. Be2 Rd8 28. Be3 Kc6 29. Rbb1 Ra7 30. c4 Rad7 31. Rc1 Rd3 32. Bxd3 Rxd3 33. Bg1 Nxc4+ 34. Rxc4 Bxc4+ 35. Kxa4 Bb5+ 0-1

[Event "IBM-B"]
[White "Milic, Borislav"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "7"]
[Result "1/2-1/2"]
[Date "1965.??.??"]
[ECO "C07"]
[PlyCount "65"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. exd5 Qxd5 5. Ngf3 cxd4 6. Bc4 Qd8 7. 0-0 Nc6 8. Nb3 Be7 9. Nfxd4 Nxd4 10. Nxd4 a6 11. Be3 Bf6 12. c3 Ne7 13. Qh5 0-0 14. Rad1 Qc7 15. Bb3 Bd7 16. Rfe1 Rfd8 17. Bc2 g6 18. Qf3 Nf5 19. Nxf5 exf5 20. Qg3 Qxg3 21. hxg3 Be6 22. a4 Rxd1 23. Rxd1 Rd8 24. Bb6 Rxd1+ 25. Bxd1 Bd5 26. Bf3 Bxf3 27. gxf3 Kf8 28. Kf1 Ke7 29. Ke2 f4 30. Bc7 fxg3 31. fxg3 Ke6 32. f4 h5 33. Bb6 1/2-1/2

[Event "IBM-B"]
[White "Orbaan, Constant"]
[Black "De Graaff, RAG"]
[Site "Amsterdam"]
[Round "2"]
[Result "0-1"]
[Date "1965.??.??"]
[ECO "A05"]
[PlyCount "32"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d3 g6 4. g3 Bg7 5. Bg2 d6 6. 0-0 Nf6 7. Re1 0-0 8. Nbd2 e5 9. Nc4 b5 10. Ne3 Nd4 11. Nh4 Bb7 12. c3 Ne6 13. Nef5 gxf5 14. exf5 Bxg2 15. fxe6 Bh3 16. exf7+ Rxf7 0-1

[Event "IBM-B"]
[White "Orbaan, Constant"]
[Black "De Rooi, Paul"]
[Site "Amsterdam"]
[Round "4"]
[Result "1/2-1/2"]
[Date "1965.??.??"]
[ECO "A53"]
[PlyCount "80"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 e5 4. d5 Bf5 5. Nf3 h6 6. g3 Be7 7. Bg2 0-0 8. Nd2 Nbd7 9. e4 Bg6 10. 0-0 Nc5 11. Qe2 a5 12. b3 Nfd7 13. Bb2 Bg5 14. Rfb1 Bxd2 15. Qxd2 f5 16. Re1 Nf6 17. exf5 Bxf5 18. Ba3 Nd3 19. Re3 e4 20. Bxe4 Nxe4 21. Nxe4 Bxe4 22. Rxe4 Nxf2 23. Re3 Nh3+ 24. Kh1 Rf2 25. Qc3 Qg5 26. Rae1 Raf8 27. Re8 Qf5 28. Rxf8+ Kxf8 29. Bb2 Rf1+ 30. Kg2 Rxe1 31. Qxe1 Qg4 32. Qf1+ Kg8 33. Qf3 Qd7 34. Bc1 Ng5 35. Bxg5 hxg5 36. h3 a4 37. Qe3 axb3 38. axb3 g4 39. h4 Qf5 40. Qe8+ Kh7 1/2-1/2

[Event "IBM-B"]
[White "Orbaan, Constant"]
[Black "Enevoldsen, Jens"]
[Site "Amsterdam"]
[Round "8"]
[Result "0-1"]
[Date "1965.??.??"]
[ECO "A21"]
[PlyCount "54"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 d6 3. Nf3 f5 4. d4 e4 5. Nd2 c6 6. e3 Nf6 7. Be2 d5 8. Qb3 a6 9. f3 b5 10. cxb5 cxb5 11. fxe4 fxe4 12. 0-0 b4 13. Ncxe4 dxe4 14. Nxe4 Be7 15. Bc4 Qb6 16. Ng5 Nc6 17. Bf7+ Kd8 18. Bd2 Na5 19. Qd3 Qb5 20. Qxb5 axb5 21. Rac1 h6 22. Rxc8+ Rxc8 23. Ne6+ Kd7 24. Nxg7 Rc2 25. Be6+ Kd8 26. Bxb4 Bxb4 27. Rxf6 Rf8 0-1

[Event "IBM-B"]
[White "Orbaan, Constant"]
[Black "Ghitescu, Theodor"]
[Site "Amsterdam"]
[Round "6"]
[Result "0-1"]
[Date "1965.??.??"]
[ECO "B26"]
[PlyCount "68"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 Rb8 7. Qd2 b5 8. Nge2 b4 9. Nd1 Nd4 10. 0-0 e6 11. Re1 Ne7 12. c3 bxc3 13. bxc3 Nxe2+ 14. Rxe2 Ba6 15. Bh6 0-0 16. Bxg7 Kxg7 17. Ne3 Nc6 18. f4 Qb6 19. e5 dxe5 20. f5 c4 21. Rf2 f6 22. fxe6 cxd3 23. Ng4 Ne7 24. Raf1 Qc5 25. h4 f5 26. Kh2 Qd6 27. c4 Bxc4 28. h5 Qxe6 29. Qh6+ Kg8 30. hxg6 hxg6 31. Ne3 Rf7 32. Nxc4 Rh7 33. Qxh7+ Kxh7 34. Ne3 Qb6 0-1

[Event "IBM-B"]
[White "Plater, Kazimierz"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "5"]
[Result "1/2-1/2"]
[Date "1965.??.??"]
[ECO "A07"]
[PlyCount "81"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. g3 d5 2. Bg2 c6 3. d3 Bg4 4. Nd2 Nd7 5. Ngf3 Ngf6 6. 0-0 e5 7. e4 d4 8. h3 Bxf3 9. Nxf3 g6 10. Nh2 Nh5 11. Qe1 Be7 12. c3 Nc5 13. cxd4 Nxd3 14. Qd1 Nxc1 15. d5 Nxa2 16. Rxa2 cxd5 17. exd5 Bd6 18. Qb3 Qe7 19. Re1 f5 20. Nf3 e4 21. Nd4 0-0 22. Nb5 Rfd8 23. Bf1 a6 24. Na3 Rac8 25. Nc4 Rc7 26. Raa1 Qg5 27. h4 Qe7 28. Rac1 Rdc8 29. Rc3 Kf8 30. Rec1 Bb4 31. R3c2 Bc5 32. d6 Bxd6 33. Nb6 Rxc2 34. Nxc8 Rxc8 35. Rxc8+ Kg7 36. Qg8+ Kh6 37. Qd8 e3 38. Qxe7 exf2+ 39. Kxf2 Bxe7 40. Be2 Nf6 41. Bf3 1/2-1/2

[Event "IBM-B"]
[White "Szilagyi, Gyorgy"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "3"]
[Result "1-0"]
[Date "1965.??.??"]
[ECO "A48"]
[PlyCount "95"]
[EventDate "1965.??.??"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 d6 3. Bf4 g6 4. h3 Bg7 5. e3 0-0 6. c3 Nbd7 7. Bc4 Qe8 8. 0-0 e5 9. Bh2 e4 10. Nfd2 Nb6 11. Bb3 Bd7 12. c4 Qe7 13. Nc3 c5 14. Bc2 cxd4 15. exd4 Rfc8 16. Ncxe4 Nxc4 17. Re1 Qd8 18. Nxc4 Nxe4 19. Bb3 d5 20. Ne5 Be6 21. f3 Nd6 22. Re2 Qb6 23. g4 Nc4 24. Kg2 Nd6 25. Bg1 Rc7 26. Bf2 Rac8 27. Qg1 Qb5 28. Qd1 Qb6 29. Qd2 a5 30. Rae1 Qa7 31. a3 a4 32. Ba2 Qb6 33. Qf4 Qa6 34. Bb1 Nc4 35. Nd3 b6 36. Nb4 Qb7 37. h4 Rd7 38. h5 Qc7 39. Qxc7 Rdxc7 40. hxg6 hxg6 41. Rxe6 fxe6 42. Rxe6 Nxb2 43. Nxd5 Nc4 44. Nxc7 Rxc7 45. Bxg6 Nxa3 46. Rxb6 Nc2 47. d5 Bd4 48. Rc6 1-0

[Event "Match/Nation ENG-NED"]
[White "Orbaan, Constant"]
[Black "Hollis, Adrian Swayne"]
[Site "Cheltenham"]
[Round "2.10"]
[Result "0-1"]
[Date "1961.10.08"]
[ECO "B26"]
[PlyCount "70"]
[EventDate "1961.10.07"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "ENG"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "England"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "ENG"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Nf6 6. Be3 d6 7. Qc1 Nd4 8. Nce2 Ng4 9. Bd2 Qb6 10. c3 Ne5 11. Nf4 Ne6 12. Bf1 Nxf4 13. Bxf4 0-0 14. Be2 f5 15. Be3 fxe4 16. dxe4 Bg4 17. Qc2 Bxe2 18. Nxe2 Qxb2 19. Qxb2 Nd3+ 20. Kd2 Nxb2 21. Rab1 Nc4+ 22. Kd3 Nxe3 23. Kxe3 b6 24. c4 Bd4+ 25. Nxd4 cxd4+ 26. Kxd4 Rxf2 27. e5 Rxa2 28. exd6 Rd8 29. Ra1 Rxd6+ 30. Ke3 Rdd2 31. h4 Re2+ 32. Kf4 Rf2+ 33. Kg4 h5+ 34. Kg5 Kg7 35. Rhf1 Rxa1 0-1

[Event "Match/Nation ENG-NED"]
[White "Hollis, Adrian Swayne"]
[Black "Orbaan, Constant"]
[Site "Cheltenham"]
[Round "1.10"]
[Result "1-0"]
[Date "1961.10.07"]
[ECO "A53"]
[PlyCount "81"]
[EventDate "1961.10.07"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "ENG"]
[SourceTitle "EXT 2006"]
[Source "ChessBase"]
[SourceDate "2005.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2005.11.24"]
[SourceQuality "1"]
[WhiteTeam "England"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ENG"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 d6 3. Nf3 Bg4 4. Nc3 c6 5. e4 e5 6. Be2 Nbd7 7. 0-0 Be7 8. Be3 0-0 9. h3 Bxf3 10. Bxf3 h6 11. Qd2 Nh7 12. Rad1 Nb6 13. Qe2 Qc7 14. Bg4 Rad8 15. f4 exd4 16. Bxd4 Bf6 17. Bf2 Rfe8 18. c5 dxc5 19. e5 Nd5 20. Bxc5 Qa5 21. Qc4 Nxc3 22. Qxc3 Qxc3 23. bxc3 b6 24. Bd7 Be7 25. Bb4 Bxb4 26. cxb4 Re7 27. Bxc6 Rc8 28. b5 g5 29. g3 Nf8 30. Rd6 Kg7 31. Rfd1 Re6 32. Kf2 gxf4 33. gxf4 h5 34. Rg1+ Rg6 35. Rgxg6+ fxg6 36. Ke3 Kf7 37. Ke4 Ke7 38. Kd5 Rc7 39. Rf6 Rc8 40. Rd6 Rc7 41. h4 1-0

[Event "Match/Nation NED-ENG"]
[White "Littlewood, John Eric"]
[Black "Orbaan, Constant"]
[Site "Vlissingen"]
[Round "2.10"]
[Result "1-0"]
[Date "1960.10.09"]
[ECO "B44"]
[PlyCount "63"]
[EventDate "1960.10.08"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "England"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "ENG"]
[BlackTeamCountry "NED"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Bd3 Nc6 6. Be3 d5 7. Nd2 Be7 8. 0-0 Qc7 9. Nb5 Qb8 10. f4 dxe4 11. Nxe4 a6 12. Nbc3 0-0 13. Qf3 Qc7 14. Qh3 Nxe4 15. Nxe4 f5 16. Ng5 Bxg5 17. fxg5 Ne7 18. g4 Ng6 19. Rae1 Bd7 20. gxf5 exf5 21. Bd4 f4 22. Re7 Nxe7 23. Qxh7+ Kf7 24. Qxg7+ Ke8 25. Bg6+ Nxg6 26. Qxg6+ Kd8 27. Bb6 f3 28. Qd6 Qxb6+ 29. Qxb6+ Ke7 30. Qb4+ Ke8 31. Re1+ Kf7 32. Re7+ 1-0

[Event "Match/Nation NED-ENG"]
[White "Orbaan, Constant"]
[Black "Littlewood, John Eric"]
[Site "Vlissingen"]
[Round "1.10"]
[Result "0-1"]
[Date "1960.10.08"]
[ECO "C63"]
[PlyCount "58"]
[EventDate "1960.10.08"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "England"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "ENG"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 f5 4. d3 Nf6 5. 0-0 d6 6. Nc3 Be7 7. a3 0-0 8. Bc4+ Kh8 9. Ng5 Qe8 10. Ne6 Bxe6 11. Bxe6 fxe4 12. dxe4 Nd4 13. Ba2 Qg6 14. f3 Nh5 15. Kh1 Bg5 16. Bxg5 Qxg5 17. Ne2 Rf6 18. Nxd4 exd4 19. Qxd4 Rh6 20. Rfe1 Rf8 21. Rad1 Qh4 22. e5 Ng3+ 23. Kg1 Qxh2+ 24. Kf2 dxe5 25. Rxe5 Rg6 26. Rd2 Ne4+ 27. Rxe4 Rxg2+ 28. Ke3 Rxf3+ 29. Kxf3 Qg3# 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Larsen, Bent"]
[Site "Copenhagen"]
[Round "7"]
[Result "0-1"]
[Date "1960.08.14"]
[ECO "B01"]
[PlyCount "74"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 d5 2. exd5 Qxd5 3. d4 Nf6 4. Nf3 Bg4 5. Be2 e6 6. Be3 Nc6 7. Nbd2 Rd8 8. c3 Be7 9. Qb3 0-0 10. Qxd5 Nxd5 11. Nc4 Rfe8 12. Nfe5 Nxe5 13. Nxe5 Bf5 14. Bd3 Bf6 15. Bxf5 exf5 16. 0-0-0 Bxe5 17. dxe5 Nxe3 18. fxe3 Kf8 19. Rd4 c5 20. Rxd8 Rxd8 21. Rf1 g6 22. e4 fxe4 23. Re1 Ke7 24. Rxe4 Ke6 25. c4 Rd4 26. Rxd4 cxd4 27. Kd2 Kxe5 28. Kd3 a5 29. b3 f5 30. a3 g5 31. b4 axb4 32. axb4 f4 33. h3 h5 34. Ke2 g4 35. hxg4 hxg4 36. Kd3 g3 37. Ke2 d3+ 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Andersen, Borge"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "1-0"]
[Date "1960.08.??"]
[ECO "A19"]
[PlyCount "81"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. e5 Ng8 5. Nf3 Nc6 6. Be2 Nge7 7. 0-0 Ng6 8. d4 cxd4 9. Nxd4 f5 10. exf6 gxf6 11. Ndb5 a6 12. Nd6+ Bxd6 13. Qxd6 Qe7 14. Qg3 0-0 15. Bh6 Rd8 16. h4 Kh8 17. h5 Nge5 18. Rad1 Rg8 19. Qh4 b5 20. Ne4 Bb7 21. Qxf6+ Qxf6 22. Nxf6 Nd4 23. f3 Nxe2+ 24. Kf2 Ng3 25. Bf4 Nxc4 26. Bxg3 Rgf8 27. Nxd7 Rf5 28. b3 Na5 29. Be5+ Kg8 30. Bc3 b4 31. Bxb4 Bc6 32. Bc3 Bxd7 33. Rxd7 Rxh5 34. Rc7 Rd8 35. Re1 Rd6 36. Re4 Nc6 37. Rg4+ Kf8 38. Rgg7 e5 39. Rcf7+ Ke8 40. Rb7 Kf8 41. Rgc7 1-0

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Barendregt, Johan"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "0-1"]
[Date "1960.08.??"]
[ECO "A14"]
[PlyCount "142"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 e6 4. 0-0 Be7 5. c4 0-0 6. b3 Nbd7 7. Bb2 c6 8. d3 b6 9. Nbd2 Bb7 10. cxd5 cxd5 11. Rc1 Rc8 12. Rxc8 Qxc8 13. Qa1 Qa8 14. Ne5 Nxe5 15. Bxe5 Rc8 16. Qb2 Rc6 17. Nf3 Qf8 18. Nd4 Rc5 19. Bh3 Kh8 20. f4 Nd7 21. Bxe6 fxe6 22. Nxe6 Qf7 23. Bxg7+ Kg8 24. Nxc5 bxc5 25. Be5 d4 26. Qc1 Nb6 27. e4 dxe3 28. Qxe3 Qd5 29. Qe4 Qd7 30. Qe2 c4 31. bxc4 Bc5+ 32. d4 Bxd4+ 33. Bxd4 Qxd4+ 34. Rf2 Be4 35. c5 Nc4 36. c6 Ne3 37. c7 Bb7 38. Rf3 Nd5+ 39. Qf2 Qe4 40. Rb3 Nxc7 41. Rxb7 Qxb7 42. Qc2 Ne8 43. g4 Qc7 44. Qe2 Nf6 45. f5 Qb6+ 46. Kg2 Qc6+ 47. Kg3 Qe4 48. Qd1 Qe5+ 49. Kh3 Qd5 50. Qe2 Qe4 51. Qd1 Nd5 52. Kh4 Qe7+ 53. Kg3 Qa3+ 54. Kh4 Qxa2 55. Kg5 Qc4 56. Qd2 Qe4 57. Qb2 Qe7+ 58. f6 Qxf6+ 59. Qxf6 Nxf6 60. Kxf6 a5 61. Ke5 Kf7 62. h4 a4 63. Kd4 Kf6 64. Kc3 Ke5 65. Kb4 Kf4 66. g5 Kg4 67. Kxa4 Kxh4 68. Kb3 Kxg5 69. Kc3 Kf4 70. Kd3 Kf3 71. Kd2 h5 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Enevoldsen, Jens"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "1-0"]
[Date "1960.08.??"]
[ECO "B30"]
[PlyCount "41"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d3 Nc6 4. g3 d6 5. Bg2 Nf6 6. Nbd2 Be7 7. 0-0 0-0 8. Re1 Bd7 9. Nc4 d5 10. exd5 Nxd5 11. a4 Bf6 12. c3 Qc7 13. Nfd2 Nce7 14. Ne4 Bc6 15. Ne3 Rad8 16. Ng4 Ng6 17. c4 Nb4 18. Ngxf6+ gxf6 19. Nxf6+ Kg7 20. Qh5 e5 21. Bg5 1-0

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Holm Pedersen, Sejer"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "0-1"]
[Date "1960.08.??"]
[ECO "A53"]
[PlyCount "108"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nf3 Bg4 4. Nc3 Nbd7 5. e4 e5 6. Be2 Be7 7. 0-0 0-0 8. h3 Bxf3 9. Bxf3 Re8 10. Be3 Nf8 11. d5 N6d7 12. Qd2 h6 13. g3 Bg5 14. Bg2 Bxe3 15. Qxe3 a5 16. Qd2 Nc5 17. Kh2 Ng6 18. h4 Ne7 19. Bh3 Kh7 20. f4 exf4 21. Qxf4 f6 22. Rad1 Kh8 23. h5 Ng8 24. Bf5 Re5 25. Rd4 Ne7 26. g4 Qe8 27. Qf3 Qf7 28. Ne2 Re8 29. Ng3 Nxf5 30. gxf5 Qe7 31. Re1 c6 32. Qa3 cxd5 33. cxd5 Qd8 34. b4 axb4 35. Qxb4 R5e7 36. Re3 Qa8 37. Ra3 Qb8 38. Kh3 Qc8 39. Qc4 Rc7 40. Qe2 Qd7 41. Rb4 Qc8 42. Qg4 Nd7 43. Ne2 Ne5 44. Qg1 Rc2 45. Ng3 Nf7 46. Qb6 Ng5+ 47. Kg4 Rg2 48. Qb5 Re5 49. Qc4 Rxe4+ 50. Qxe4 Nxe4 51. Rxe4 Kh7 52. Rae3 Qc5 53. Rd3 Rxa2 54. Ne2 Qf2 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Kolvig, Bent"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "0-1"]
[Date "1960.08.??"]
[ECO "A53"]
[PlyCount "106"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 d6 3. d4 e5 4. dxe5 dxe5 5. Qxd8+ Kxd8 6. Nf3 Nfd7 7. Be3 f6 8. 0-0-0 c6 9. g4 Kc7 10. Rg1 Nb6 11. b3 Be6 12. g5 N8d7 13. gxf6 gxf6 14. Kb2 Re8 15. a4 Bb4 16. Ne4 Rhg8 17. Rg3 Bf5 18. Bxb6+ Kxb6 19. Nh4 Bxe4 20. Rxd7 Rd8 21. Bh3 Rxd7 22. Bxd7 Rxg3 23. fxg3 Kc5 24. Bf5 Kd4 25. Bxe4 Kxe4 26. Ng2 f5 27. Kc2 h5 28. Kd1 Bc5 29. Nh4 Bd6 30. Kd2 Bb4+ 31. Kd1 f4 32. gxf4 Kxf4 33. Nf3 e4 34. Nd2 h4 35. Nf1 h3 36. Kc2 a5 37. Kd1 Bd6 38. Kd2 Be5 39. Ng3 Bc7 40. Nh1 Kf5 41. Nf2 Bf4+ 42. Ke1 Bxh2 43. Nxh3 Bd6 44. Kf1 Bc5 45. Nf2 Bxf2 46. Kxf2 Kf4 47. c5 Ke5 48. Ke3 Kd5 49. Kf4 Kd4 50. Kf5 Ke3 51. Ke5 Kxe2 52. Kd6 Kd3 53. Kc7 e3 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Geller, Efim P"]
[Site "Copenhagen"]
[Round "?"]
[Result "0-1"]
[Date "1960.08.??"]
[ECO "B26"]
[PlyCount "66"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. Be3 d6 7. Qd2 Rb8 8. Nh3 Nd4 9. 0-0 Nf6 10. Nd1 Ng4 11. c3 Nc6 12. f4 0-0 13. Qe2 Nxe3 14. Nxe3 b5 15. g4 b4 16. e5 Qd7 17. Qf3 Bb7 18. Ng5 Nxe5 19. Qh3 h6 20. Bxb7 hxg5 21. fxe5 Rxb7 22. Nc4 d5 23. Nd6 Rb6 24. Qe3 bxc3 25. bxc3 Rxd6 26. Qxg5 Rb6 27. h4 d4 28. c4 Rb2 29. Rae1 Qd8 30. Rf6 Bxf6 31. exf6 Qb8 32. Re5 Rb1+ 33. Kf2 Qb2+ 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Golz, Werner"]
[Site "Copenhagen"]
[Round "?"]
[Result "0-1"]
[Date "1960.08.??"]
[ECO "C02"]
[PlyCount "80"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Nc6 6. a3 c4 7. g3 Bd7 8. Bg2 f6 9. exf6 gxf6 10. 0-0 0-0-0 11. Re1 Nge7 12. Nbd2 Ng6 13. b3 cxb3 14. Nxb3 h5 15. Be3 h4 16. Qc2 Be8 17. c4 hxg3 18. fxg3 Qc7 19. Bf2 Bf7 20. cxd5 Rxd5 21. Nfd2 Rdh5 22. Nf1 Bd6 23. Nbd2 Nge7 24. Ne4 Nd5 25. Nxd6+ Qxd6 26. Rab1 Kb8 27. g4 Rg5 28. Bg3 e5 29. Qb2 b6 30. Rbc1 Rxg4 31. Rxc6 Qxc6 32. dxe5 Qc5+ 33. Kh1 Nf4 34. e6 Rxg3 35. Nxg3 Nxg2 36. Qxg2 Re8 37. Qd2 Bxe6 38. Rd1 Qc6+ 39. Kg1 Qc5+ 40. Qd4 Rd8 0-1

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Hamann, Svend"]
[Site "Copenhagen"]
[Round "?"]
[Result "1-0"]
[Date "1960.08.??"]
[ECO "C68"]
[PlyCount "45"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[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. Bxc6 dxc6 5. Nc3 Qd6 6. d3 c5 7. Be3 f6 8. Ng1 Be6 9. Nge2 0-0-0 10. f4 Ne7 11. fxe5 Qxe5 12. Qd2 Nc6 13. 0-0-0 Nd4 14. Nf4 Bg4 15. Rdf1 c6 16. h3 Bd7 17. Na4 Qc7 18. b4 cxb4 19. Bxd4 c5 20. Nd5 Qa5 21. Nab6+ Kb8 22. Qf4+ Ka7 23. Qc7 1-0

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Nielsen, Axel"]
[Site "Copenhagen"]
[Round "?"]
[Result "1/2-1/2"]
[Date "1960.08.??"]
[ECO "C02"]
[PlyCount "89"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Nge7 6. Na3 cxd4 7. cxd4 Nf5 8. Nc2 Be7 9. Be2 0-0 10. b3 Bd7 11. Bb2 Qb6 12. 0-0 a5 13. Qd3 a4 14. Rfb1 a3 15. Bc3 Na7 16. Ne3 Bb5 17. Qd2 Bxe2 18. Nxf5 exf5 19. Qxe2 Nb5 20. Qd3 Rac8 21. Rc1 Rc6 22. Bd2 g6 23. Rxc6 bxc6 24. Bh6 Rc8 25. Qd2 Nc7 26. Bg5 Bb4 27. Qf4 Ne6 28. Qh4 c5 29. Rc1 Rc6 30. h3 Qb5 31. Be7 c4 32. bxc4 Rxc4 33. Rxc4 Qxc4 34. Bd6 Ba5 35. Qe7 Bd8 36. Qe8+ Kg7 37. Bf8+ Nxf8 38. Qxd8 Ne6 39. Qf6+ Kg8 40. Kh2 Qxa2 41. Ng5 Nxg5 42. Qxg5 Qxf2 43. h4 h6 44. Qd8+ Kh7 45. Qf6 1/2-1/2

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Orbaan, Constant"]
[Black "Petrosian, Tigran V"]
[Site "Copenhagen"]
[Round "?"]
[Result "1/2-1/2"]
[Date "1960.08.??"]
[ECO "B17"]
[PlyCount "25"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Nf3 Ngf6 6. Ng3 e6 7. Bd3 c5 8. 0-0 Be7 9. Qe2 0-0 10. Rd1 cxd4 11. Nxd4 Nc5 12. Nb3 Nxd3 13. Rxd3 1/2-1/2

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Pietzsch, Wolfgang"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "1-0"]
[Date "1960.08.??"]
[ECO "B45"]
[PlyCount "71"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Nxc6 bxc6 7. e5 Nd5 8. Ne4 Qc7 9. f4 f5 10. exf6 Nxf6 11. Nxf6+ gxf6 12. Qh5+ Kd8 13. Be3 d5 14. Be2 Qg7 15. 0-0-0 Bd6 16. g3 Bd7 17. Qf3 Kc7 18. Qf2 Qe7 19. c4 Kb7 20. Rd3 dxc4 21. Rc3 Rac8 22. Bf3 e5 23. Rxc4 Be6 24. Ra4 a6 25. Qe2 Ra8 26. Qc2 Rhc8 27. Kb1 exf4 28. Bxf4 Bxf4 29. Rxf4 Rab8 30. Re4 Qf7 31. Rb4+ Ka8 32. Bxc6+ Rxc6 33. Qxc6+ Ka7 34. Qc5+ Ka8 35. Rxb8+ Kxb8 36. Qb6+ 1-0

[Event "Copenhagen Nimzowitsch Memorial"]
[White "Stahlberg, Gideon"]
[Black "Orbaan, Constant"]
[Site "Copenhagen"]
[Round "?"]
[Result "1-0"]
[Date "1960.08.??"]
[ECO "D41"]
[PlyCount "75"]
[EventDate "1960.08.07"]
[EventType "tourn"]
[EventRounds "13"]
[EventCountry "DEN"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nc3 d5 4. Nf3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bc4 cxd4 8. exd4 Be7 9. 0-0 0-0 10. Bb3 Nxc3 11. bxc3 b6 12. Qd3 Bb7 13. Bc2 g6 14. Bh6 Re8 15. Rfe1 Bf6 16. Rad1 Rc8 17. Ba4 Qd5 18. c4 Qh5 19. Qe3 Red8 20. d5 Ne7 21. dxe6 Qf5 22. exf7+ Kxf7 23. Bc2 Rxd1 24. Bxf5 Rxe1+ 25. Qxe1 gxf5 26. Ne5+ Bxe5 27. Qxe5 Rg8 28. g3 Rg6 29. Qc7 Be4 30. Be3 Rc6 31. Qd7 h5 32. f3 Bb1 33. Bg5 Re6 34. Qd1 Bxa2 35. Qc2 Re1+ 36. Kf2 Rh1 37. Kg2 Ra1 38. Qb2 1-0

[Event "Krakow"]
[White "Orbaan, Constant"]
[Black "Kortschnoj, Viktor Lvovich"]
[Site "Krakow"]
[Round "11"]
[Result "1/2-1/2"]
[Date "1959.09.25"]
[ECO "C13"]
[PlyCount "28"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 0-0 8. c3 Nd7 9. Bd3 e5 10. Nxf6+ Qxf6 11. dxe5 Nxe5 12. Nxe5 Qxe5+ 13. Qe2 Re8 14. Qxe5 Rxe5+ 1/2-1/2

[Event "Krakow"]
[White "Brzozka, Stefan"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "10"]
[Result "1/2-1/2"]
[Date "1959.09.23"]
[ECO "B45"]
[PlyCount "113"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Bd3 0-0 11. 0-0 h6 12. Re1 Bg4 13. f3 Bh5 14. b4 Qd6 15. Nb5 Qd8 16. Bb2 Qb6+ 17. Kh1 Ne4 18. Bxe4 dxe4 19. Qd5 Bg6 20. fxe4 Rad8 21. Qc4 a6 22. Nc3 Rd2 23. Nd1 Rfd8 24. Ne3 Qb5 25. Qxb5 axb5 26. Bc3 R2d7 27. Nf5 Bxf5 28. exf5 Ne7 29. Rf1 Nd5 30. Bd2 Rc8 31. Ra2 Ne7 32. Be3 Rc3 33. Bc5 Nxf5 34. g3 Ne3 35. Bxe3 Rxe3 36. Rf2 Rd1+ 37. Kg2 Rc1 38. a4 g5 39. axb5 g4 40. h3 h5 41. hxg4 hxg4 42. Rf1 Re2+ 43. Kg1 Rcxc2 44. Rxc2 Rxc2 45. Rf4 Kf8 46. Rxg4 Ke7 47. Kf1 Ke6 48. Rd4 f5 49. Rh4 Rc7 50. Kf2 Ke5 51. Rh8 Rc2+ 52. Kf3 Rc3+ 53. Kg2 Rc2+ 54. Kh3 Rc7 55. Rh6 Rg7 56. Rh4 Rd7 57. Rh6 1/2-1/2

[Event "Krakow"]
[White "Orbaan, Constant"]
[Black "Forintos, Gyozo Victor"]
[Site "Krakow"]
[Round "9"]
[Result "0-1"]
[Date "1959.09.21"]
[ECO "B41"]
[PlyCount "54"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. Bd2 0-0 8. e5 Bxc3 9. Bxc3 Ne4 10. Qc2 Nxc3 11. Qxc3 d6 12. Rd1 d5 13. Bd3 dxc4 14. Be4 Qh4 15. Bb1 b5 16. Nf3 Qe7 17. Rd4 Bb7 18. Bxh7+ Kxh7 19. Rh4+ Kg8 20. Qc2 f5 21. exf6 Qxf6 22. Qh7+ Kf7 23. Qh5+ Ke7 24. Qc5+ Ke8 25. Rd4 Bxf3 26. gxf3 Nd7 27. Qd6 Qe5+ 0-1

[Event "Krakow"]
[White "Tarnowski, Alfred"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "8"]
[Result "0-1"]
[Date "1959.09.20"]
[ECO "B45"]
[PlyCount "86"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Be2 d4 11. Na2 0-0 12. 0-0 Bf5 13. b4 Qd7 14. Bb2 Rad8 15. Nc1 Rfe8 16. Nb3 a6 17. Rc1 Qd5 18. Bf3 Be4 19. Re1 Bxf3 20. Rxe8+ Nxe8 21. Qxf3 Qxf3 22. gxf3 Nc7 23. Nc5 b6 24. Nxa6 Nxa6 25. b5 Nab8 26. bxc6 Nxc6 27. Rd1 f6 28. Kg2 Kf7 29. Rd3 b5 30. c3 Ne5 31. Rd1 d3 32. Bc1 Nc4 33. Be3 Nxa3 34. Bd4 Nc2 35. Bb6 Rd7 36. Kf1 Na3 37. Bd4 b4 38. Bc5 bxc3 39. Bxa3 d2 40. Ke2 Ra7 41. Ra1 Ke6 42. Kd1 Kd5 43. Kc2 Kc4 0-1

[Event "Krakow"]
[White "Orbaan, Constant"]
[Black "Book, Eero"]
[Site "Krakow"]
[Round "7"]
[Result "0-1"]
[Date "1959.09.19"]
[ECO "B26"]
[PlyCount "69"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Nf6 6. Be3 d6 7. Qc1 0-0 8. Bh6 e5 9. Bxg7 Kxg7 10. Nge2 Rb8 11. 0-0 b5 12. f4 c4 13. h3 cxd3 14. cxd3 b4 15. Nd1 Qb6+ 16. Kh2 Ba6 17. fxe5 Ne8 18. e6 fxe6 19. Rxf8 Kxf8 20. Qh6+ Kg8 21. Nf2 Ne5 22. Rf1 Nf6 23. Qd2 Rf8 24. Nf4 Re8 25. g4 g5 26. Nd5 exd5 27. Qxg5+ Ng6 28. Qxf6 Rf8 29. Qe6+ Kg7 30. Nh1 Rxf1 31. Bxf1 dxe4 32. Ng3 Qf2+ 33. Kh1 Qxg3 34. Qd7+ Kh6 35. Qf5 0-1

[Event "Krakow"]
[White "Sliwa, Bogdan Stanislaw"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "6"]
[Result "1-0"]
[Date "1959.09.17"]
[ECO "D64"]
[PlyCount "63"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. c4 Nf6 2. Nc3 e6 3. d4 d5 4. Bg5 Nbd7 5. e3 c6 6. a3 Be7 7. Nf3 0-0 8. Qc2 Re8 9. Rc1 a6 10. h3 h6 11. Bf4 dxc4 12. Bxc4 b5 13. Ba2 c5 14. d5 c4 15. dxe6 fxe6 16. Bxh6 Nc5 17. Qg6 Nd3+ 18. Kf1 Bf8 19. Rd1 Ra7 20. Bg5 Be7 21. Bb1 Rd7 22. Bxd3 Rxd3 23. Ke2 Nd5 24. Nxd5 Rxd5 25. Rxd5 exd5 26. Rd1 c3 27. Bxe7 Qxe7 28. Ng5 Be6 29. Rd4 cxb2 30. Qh7+ Kf8 31. Qh8+ Bg8 32. Rf4+ 1-0

[Event "Krakow"]
[White "Orbaan, Constant"]
[Black "Gromek, Jozef"]
[Site "Krakow"]
[Round "5"]
[Result "1-0"]
[Date "1959.09.16"]
[ECO "B52"]
[PlyCount "81"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. 0-0 Nf6 6. Re1 Nc6 7. c3 g6 8. d4 cxd4 9. cxd4 Bg7 10. Nc3 0-0 11. d5 Ne5 12. Nxe5 dxe5 13. f3 Nh5 14. Qa4 Qd6 15. Be3 a6 16. Rac1 Nf4 17. Qd1 Rac8 18. g3 Nh5 19. Re2 f5 20. Rec2 f4 21. gxf4 Nxf4 22. Ne2 Rxc2 23. Rxc2 Nh3+ 24. Kg2 Qf6 25. Ng3 Nf4+ 26. Bxf4 exf4 27. Ne2 g5 28. Rd2 g4 29. Nd4 Qh4 30. Nf5 Qh3+ 31. Kh1 gxf3 32. Nxe7+ Kh8 33. d6 Bd4 34. Rc2 Bb6 35. b3 Rf6 36. d7 Rd6 37. Rc8+ Kg7 38. Nf5+ Qxf5 39. Qxd6 f2 40. Qd3 f1Q+ 41. Qxf1 1-0

[Event "Krakow"]
[White "Bertok, Mario"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "4"]
[Result "1/2-1/2"]
[Date "1959.09.15"]
[ECO "B37"]
[PlyCount "39"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. d4 cxd4 4. Nxd4 Nc6 5. c4 Bg7 6. Nc2 d6 7. Be2 f5 8. exf5 Bxf5 9. 0-0 Nf6 10. Ne3 Be6 11. Nc3 0-0 12. Ned5 Qd7 13. Be3 Ng4 14. Bxg4 Bxg4 15. Qd2 Ne5 16. f3 Nxc4 17. Qe2 Nxe3 18. Qxe3 Be6 19. Rae1 Bxd5 20. Nxd5 1/2-1/2

[Event "Krakow"]
[White "Orbaan, Constant"]
[Black "Witkowski, Stefan"]
[Site "Krakow"]
[Round "3"]
[Result "0-1"]
[Date "1959.09.13"]
[ECO "C00"]
[PlyCount "77"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d3 d5 4. Nbd2 Nc6 5. g3 Nf6 6. Bg2 Be7 7. 0-0 0-0 8. c3 dxe4 9. dxe4 b6 10. e5 Nd5 11. Re1 Bb7 12. a3 Nc7 13. Qc2 Qd7 14. Ne4 Rad8 15. Bf1 h6 16. Bf4 Nd5 17. Rad1 Qc7 18. Bc1 Nxe5 19. Nxe5 Qxe5 20. Ng5 Qf5 21. Bd3 Qf6 22. Nh7 Qf3 23. Be4 Ne3 24. Bxf3 Nxc2 25. Bxb7 Nxe1 26. Rxe1 Kxh7 27. f4 Bf6 28. Kf2 Kg8 29. h4 Rd7 30. Be4 Rfd8 31. Bc2 b5 32. Be3 b4 33. axb4 cxb4 34. cxb4 Bxb2 35. Kf3 Bc3 36. Rb1 Bd4 37. Bd2 Bb6 38. Be1 Rc8 39. Be4 0-1

[Event "Krakow"]
[White "Kostro, Jerzy"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "2"]
[Result "1-0"]
[Date "1959.09.12"]
[ECO "C13"]
[PlyCount "63"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Be7 6. Bxf6 Bxf6 7. Nf3 Nd7 8. Bc4 0-0 9. 0-0 Nb6 10. Bb3 Bd7 11. Qe2 g6 12. Nxf6+ Qxf6 13. Ne5 Rfd8 14. Rad1 Ba4 15. Bxa4 Nxa4 16. Rd3 Qe7 17. c3 Nb6 18. Rf3 f5 19. Re1 Rd6 20. Qe3 Nd7 21. Nd3 Re8 22. h3 Nf6 23. Qe5 Rd5 24. Qe2 Ne4 25. Re3 Qh4 26. f3 Ng5 27. Qf2 Qxf2+ 28. Kxf2 Rd6 29. Nf4 c5 30. d5 e5 31. Rxe5 Ne4+ 32. R1xe4 1-0

[Event "Krakow"]
[White "Kozma, Julius"]
[Black "Orbaan, Constant"]
[Site "Krakow"]
[Round "1"]
[Result "1-0"]
[Date "1959.09.11"]
[ECO "E57"]
[PlyCount "157"]
[EventDate "1959.??.??"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]

1. d4 e6 2. Nf3 d5 3. c4 Nf6 4. Nc3 c5 5. cxd5 Nxd5 6. e3 Nc6 7. Bc4 cxd4 8. exd4 Be7 9. 0-0 0-0 10. Re1 Nf6 11. Bg5 b6 12. a3 Bb7 13. Qd3 Rc8 14. Rad1 Rc7 15. Ba2 Qa8 16. Bxf6 Bxf6 17. d5 Nd8 18. Ne4 Bxd5 19. Nxf6+ gxf6 20. Bxd5 Qxd5 21. Qxd5 exd5 22. Rxd5 Ne6 23. Rd2 Rfc8 24. g3 Rc1 25. Rxc1 Rxc1+ 26. Kg2 Rc7 27. Nh4 Kf8 28. Nf5 Ke8 29. Nd6+ Ke7 30. Nb5 Rb7 31. f4 a6 32. Nc3 Kf8 33. Rd6 Ke7 34. Rd2 Kf8 35. f5 Nc5 36. b4 Nd7 37. Rd6 Kg7 38. Nd5 h5 39. h4 a5 40. b5 a4 41. Kh3 Ra7 42. Nxb6 Nxb6 43. Rxb6 Rd7 44. Ra6 Rd5 45. b6 Rb5 46. Kg2 Rb2+ 47. Kf1 Rb3 48. Rxa4 Rxb6 49. Rb4 Rc6 50. Rb3 Rc2 51. Ke1 Kf8 52. Re3 Ra2 53. Kd1 Rf2 54. Kc1 Rxf5 55. a4 Ra5 56. Ra3 Ke7 57. Kb2 f5 58. Kc3 Ke6 59. Kb4 Ra8 60. Re3+ Kd5 61. a5 Rb8+ 62. Ka4 Kc4 63. Rf3 Rb4+ 64. Ka3 Rb1 65. Rf4+ Kb5 66. Rxf5+ Ka6 67. Ka4 Ra1+ 68. Kb4 Rb1+ 69. Kc4 Rg1 70. Rf3 Kxa5 71. Kd4 Kb6 72. Ke5 Kc6 73. Kf6 Kd5 74. Kxf7 Ke4 75. Ra3 Kf5 76. Ra5+ Kg4 77. Rg5+ Kh3 78. Kg6 Ra1 79. Kxh5 1-0

[Event "Match/Nation NED-FRG"]
[White "Bialas, Wolfram"]
[Black "Orbaan, Constant"]
[Site "Amersfoort"]
[Round "1.9"]
[Result "0-1"]
[Date "1959.07.10"]
[ECO "C11"]
[PlyCount "60"]
[EventDate "1959.07.10"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "NED"]
[SourceTitle "EXT 2010"]
[Source "ChessBase"]
[SourceDate "2010.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2010.11.25"]
[SourceQuality "1"]
[WhiteTeam "German Fed Rep"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "GER"]
[BlackTeamCountry "NED"]

1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. dxc5 Bxc5 7. Qg4 g6 8. Nf3 Nc6 9. Bd2 a6 10. h4 h5 11. Qh3 b5 12. Bd3 Nb6 13. a4 bxa4 14. Nxa4 Nxa4 15. Rxa4 Qb6 16. Ke2 Bd7 17. Ra2 Nb4 18. Bxb4 Qxb4 19. Qg3 Bb5 20. Ne1 0-0 21. Kd1 Bxd3 22. Nxd3 Qc4 23. b3 Qc3 24. Qf3 Rfc8 25. g4 hxg4 26. Qxg4 Be3 27. Rh2 Rab8 28. Rb2 Rb4 29. Qf3 Rd4 30. Qxe3 Qxb2 0-1

[Event "Warsaw Legion Team-ch"]
[White "Orbaan, Constant"]
[Black "Blaszczak, Czeslaw"]
[Site "Warsaw"]
[Round "5.2"]
[Result "1/2-1/2"]
[Date "1959.06.29"]
[ECO "C60"]
[PlyCount "42"]
[EventDate "1959.06.23"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam CC"]
[BlackTeam "Wroclaw Hetman"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "POL"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 g6 4. d4 Nxd4 5. Nxd4 exd4 6. Qxd4 Qf6 7. Qxf6 Nxf6 8. 0-0 Bg7 9. Nc3 0-0 10. f3 d6 11. Be3 Be6 12. Rad1 c6 13. Ba4 d5 14. Bc5 Rfe8 15. exd5 Nxd5 16. Nxd5 Bxd5 17. Rxd5 cxd5 18. Bxe8 Rxe8 19. c3 Re2 20. Rf2 Re1+ 21. Rf1 Re2 1/2-1/2

[Event "Warsaw Legion Team-ch"]
[White "Ziembinski, Marian"]
[Black "Orbaan, Constant"]
[Site "Warsaw"]
[Round "4.2"]
[Result "1/2-1/2"]
[Date "1959.06.27"]
[ECO "B44"]
[PlyCount "74"]
[EventDate "1959.06.23"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]
[WhiteTeam "Warsaw Legion"]
[BlackTeam "Amsterdam CC"]
[WhiteTeamCountry "POL"]
[BlackTeamCountry "NED"]

1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. Nf3 Nc6 5. d4 cxd4 6. Nxd4 Bb4 7. Nxc6 dxc6 8. Qxd8+ Kxd8 9. Bd2 e5 10. Be2 Be6 11. 0-0-0 Kc8 12. f3 Nd7 13. Kc2 Bc5 14. Na4 Bd4 15. Ba5 f6 16. b3 b6 17. Be1 Rd8 18. g4 Nf8 19. h4 Bd7 20. f4 c5 21. f5 Bc6 22. Bd3 Kd7 23. Nc3 Bxc3 24. Bxc3 Ke8 25. Rhe1 Rd6 26. Kd2 Rad8 27. Ke3 Nd7 28. Be2 Nb8 29. Rxd6 Rxd6 30. a3 a5 31. g5 Bb7 32. gxf6 gxf6 33. Rg1 Kf8 34. b4 axb4 35. axb4 Nc6 36. bxc5 bxc5 37. Rb1 Rd7 1/2-1/2

[Event "Warsaw Legion Team-ch"]
[White "Franz, Joachim"]
[Black "Orbaan, Constant"]
[Site "Warsaw"]
[Round "2.2"]
[Result "1-0"]
[Date "1959.06.25"]
[ECO "B23"]
[PlyCount "73"]
[EventDate "1959.06.23"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]
[WhiteTeam "Lipsk Rotation"]
[BlackTeam "Amsterdam CC"]
[WhiteTeamCountry "DDR"]
[BlackTeamCountry "NED"]

1. e4 c5 2. Nc3 a6 3. g3 b5 4. Bg2 Bb7 5. Nge2 Nf6 6. d3 g6 7. 0-0 d6 8. Re1 Nc6 9. d4 cxd4 10. Nxd4 Nxd4 11. Qxd4 e5 12. Qd3 Be7 13. Bg5 Qc7 14. Rad1 Rd8 15. Rd2 h6 16. Bxf6 Bxf6 17. Nd1 Bc8 18. Ne3 Be6 19. a4 Qa5 20. axb5 axb5 21. Bf1 0-0 22. Red1 b4 23. Qa6 Qxa6 24. Bxa6 Be7 25. Bc4 Rc8 26. Bxe6 fxe6 27. h4 h5 28. Kg2 Kg7 29. Rd3 Kf6 30. Rb3 Rb8 31. Ra1 Rfd8 32. Ra6 Kf7 33. Rd3 Rdc8 34. b3 Kf6 35. Nc4 Bf8 36. Ra7 Be7 37. Rf3+ 1-0

[Event "Warsaw Legion Team-ch"]
[White "Orbaan, Constant"]
[Black "Djaja, Dragutin"]
[Site "Warsaw"]
[Round "1.2"]
[Result "1/2-1/2"]
[Date "1959.06.24"]
[ECO "B24"]
[PlyCount "78"]
[EventDate "1959.06.23"]
[EventType "team"]
[EventRounds "5"]
[EventCountry "POL"]
[SourceTitle "EXT 2001"]
[Source "ChessBase"]
[SourceDate "2000.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2000.11.22"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam CC"]
[BlackTeam "Belgrade Zemun"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "YUG"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 e6 6. Bd2 b5 7. Qc1 b4 8. Nd1 Ba6 9. Ne3 Nge7 10. Ne2 Rc8 11. 0-0 0-0 12. Re1 Nd4 13. a3 Qb6 14. axb4 cxb4 15. Rxa6 Qxa6 16. Nxd4 Bxd4 17. Bxb4 d6 18. Nc4 Bc5 19. Bc3 e5 20. b4 Bb6 21. Qb2 Rcd8 22. b5 Qc8 23. Nxb6 axb6 24. d4 f6 25. f4 Qc4 26. Bf1 Qc7 27. dxe5 dxe5 28. fxe5 Qc5+ 29. Kh1 fxe5 30. Bxe5 Rd2 31. Qb3+ Rf7 32. Bf4 Qxc2 33. Qxc2 Rxc2 34. Ra1 Kg7 35. Bh3 Rc5 36. Be6 Rf6 37. Bd7 Nc8 38. Ra8 Ne7 39. e5 Rf8 1/2-1/2

[Event "Match/Nation NED-BEL"]
[White "Winants, Henri"]
[Black "Orbaan, Constant"]
[Site "Deventer"]
[Round "?"]
[Result "0-1"]
[Date "1959.??.??"]
[ECO "A05"]
[PlyCount "44"]
[EventDate "1959.??.??"]
[EventType "team"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 b5 3. Bg2 Bb7 4. 0-0 g6 5. d3 Bg7 6. e4 d6 7. Nc3 b4 8. Ne2 Nbd7 9. Bd2 c5 10. Qc1 0-0 11. Bh6 Re8 12. Nh4 Nf8 13. Bxg7 Kxg7 14. f4 Qb6 15. e5 Bxg2 16. Kxg2 Nd5 17. Qd2 f6 18. Rf3 Ne6 19. Raf1 Qc6 20. Kg1 dxe5 21. fxe5 Ng5 22. Rf5 Nh3+ 0-1

[Event "NED-ch19"]
[White "Donner, Jan Hein"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "11"]
[Result "1-0"]
[Date "1958.12.22"]
[ECO "E80"]
[PlyCount "63"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 d6 3. Nc3 g6 4. e4 Bg7 5. f3 c6 6. Be3 a6 7. d5 0-0 8. Nge2 Nbd7 9. Nd4 c5 10. Nc2 Ne8 11. Qd2 Nc7 12. a4 b6 13. Be2 Nf6 14. 0-0 Rb8 15. Rab1 a5 16. f4 Bd7 17. h3 Nfe8 18. b3 Na6 19. Ne1 f5 20. exf5 Bxf5 21. Rc1 Nf6 22. Nf3 Qc8 23. Bd3 Bxd3 24. Qxd3 Qf5 25. Qd2 Nc7 26. g4 Qd7 27. Ng5 Nfe8 28. Rce1 Bf6 29. f5 gxf5 30. Rxf5 Ng7 31. Rf2 Be5 32. Qd3 1-0

[Event "NED-ch19"]
[White "Orbaan, Constant"]
[Black "Spanjaard, Eduard"]
[Site "Amsterdam"]
[Round "10"]
[Result "0-1"]
[Date "1958.12.20"]
[ECO "E79"]
[PlyCount "64"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[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. Be2 0-0 6. f4 c5 7. Nf3 cxd4 8. Nxd4 Nc6 9. Be3 Bg4 10. Nxc6 Bxe2 11. Nxd8 Bxd1 12. Rxd1 Rfxd8 13. Bd4 a6 14. 0-0 b5 15. cxb5 axb5 16. a3 Rdb8 17. Rf2 b4 18. axb4 Ng4 19. Bxg7 Nxf2 20. Kxf2 Kxg7 21. b5 Rb6 22. Rd4 Ra1 23. Rb4 Kf8 24. b3 Ke8 25. Na4 Rb7 26. b6 Kd7 27. Rc4 Rb8 28. e5 Ra3 29. exd6 exd6 30. Rc3 Rc8 31. b7 Rxc3 32. b8Q Ra2+ 0-1

[Event "NED-ch19"]
[White "Van Weezel, Chr"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "9"]
[Result "1-0"]
[Date "1958.12.19"]
[ECO "E60"]
[PlyCount "115"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[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. Nf3 0-0 5. e3 d6 6. Be2 Nbd7 7. 0-0 c6 8. b3 Re8 9. Bb2 Qc7 10. Rc1 Nf8 11. Qd2 Bf5 12. Nh4 Bd7 13. f4 Rad8 14. Qe1 e5 15. fxe5 dxe5 16. Qg3 Bc8 17. Rf2 Qe7 18. d5 cxd5 19. cxd5 a6 20. Rcf1 b5 21. a3 N8d7 22. b4 Rf8 23. e4 Ne8 24. Nf3 Nd6 25. Bc1 Bb7 26. Bd3 Rc8 27. Nb1 Rc7 28. Qh3 Rfc8 29. Bd2 f6 30. Qg4 Nb6 31. Be3 Nbc4 32. Bc5 Qd7 33. Qh4 Ra8 34. Bxc4 Nxc4 35. Nfd2 Nxd2 36. Nxd2 Qc8 37. Nb3 Rf7 38. Rc1 Qd7 39. Be3 Rc8 40. Nc5 Qe8 41. Rd1 Ra8 42. Rfd2 Bc8 43. Rf2 a5 44. Bd2 axb4 45. Bxb4 f5 46. Qg3 f4 47. Qb3 g5 48. Rc2 Bg4 49. Rd3 Bf8 50. d6 Kh8 51. Qd5 Rd8 52. Nb7 Rdd7 53. Na5 Bg7 54. Rdc3 Be6 55. Rc8 Rd8 56. Rxd8 Qxd8 57. Qxe6 Qb6+ 58. Kf1 1-0

[Event "NED-ch19"]
[White "Orbaan, Constant"]
[Black "Van den Berg, Carel"]
[Site "Amsterdam"]
[Round "8"]
[Result "0-1"]
[Date "1958.12.18"]
[ECO "B52"]
[PlyCount "64"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. 0-0 Nc6 6. c3 Nf6 7. Re1 e6 8. d3 Be7 9. Nbd2 0-0 10. Nf1 b5 11. Ng3 Qb7 12. Bf4 Rfd8 13. Qd2 d5 14. e5 Ne8 15. Ng5 Rab8 16. Qe2 Bf8 17. Qg4 h6 18. Nh5 hxg5 19. Bxg5 d4 20. Nf6+ Nxf6 21. exf6 g6 22. c4 bxc4 23. dxc4 Qxb2 24. Rad1 d3 25. Re3 Qc2 26. f4 Rb1 27. Ree1 Rxd1 28. Rxd1 d2 29. h4 Qf5 30. Qf3 Nd4 31. Qb7 Qg4 32. Qb1 Ne2+ 0-1

[Event "NED-ch19"]
[White "Van Donk, Henk"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "7"]
[Result "1-0"]
[Date "1958.12.17"]
[ECO "B47"]
[PlyCount "63"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. g3 Nf6 7. Bg2 Nc6 8. 0-0 b5 9. e5 Ng8 10. Nxc6 dxc6 11. Be3 f5 12. exf6 Nxf6 13. Bf4 Qd7 14. Qf3 Nd5 15. Rad1 Qf7 16. Rfe1 Be7 17. Nxd5 cxd5 18. Qb3 g5 19. Be3 Bb7 20. Bd4 Rg8 21. Rd3 g4 22. Rde3 Rg6 23. f4 Rh6 24. Re5 Kf8 25. Qe3 Rc8 26. c3 Rc6 27. Bxd5 exd5 28. Rxe7 Qh5 29. Re8+ Kf7 30. Qe7+ Kg6 31. Qg7+ Kf5 32. R1e5# 1-0

[Event "NED-ch19"]
[White "Orbaan, Constant"]
[Black "Roessel, Frits"]
[Site "Amsterdam"]
[Round "6"]
[Result "1-0"]
[Date "1958.12.16"]
[ECO "B29"]
[PlyCount "109"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nf6 3. e5 Nd5 4. Nc3 Nxc3 5. dxc3 Nc6 6. Bc4 e6 7. Bf4 Qc7 8. Qd2 b6 9. 0-0-0 h6 10. h4 Bb7 11. Bg3 0-0-0 12. Qf4 f5 13. h5 Rg8 14. Nh4 Be7 15. Qd2 Rde8 16. Ng6 Bd8 17. Qe2 Nb8 18. f3 Be7 19. Rd2 Bc6 20. a4 Qb7 21. Bb5 a6 22. Bxc6 Qxc6 23. b3 Bg5 24. Bf4 Bxf4 25. Nxf4 Re7 26. Rd6 Qb7 27. Qc4 Nc6 28. Ng6 Rf7 29. b4 cxb4 30. cxb4 b5 31. axb5 Qxb5 32. Qxb5 axb5 33. c3 Kc7 34. Rhd1 Rd8 35. g3 Ne7 36. Nf4 Nc6 37. Ng6 Ra8 38. Kb2 Ra7 39. R1d2 Rb7 40. Rd1 Ra7 41. Kb3 Ra4 42. Rc1 Na7 43. c4 Nc6 44. Rxc6+ dxc6 45. cxb5 Ra8 46. Rxc6+ Kd8 47. Rxe6 Rd7 48. Kc4 Ra3 49. Ra6 Rc7+ 50. Rc6 Rxf3 51. e6 Rxg3 52. e7+ Rxe7 53. Nxe7 Rg4+ 54. Kc5 Re4 55. Nd5 1-0

[Event "NED-ch19"]
[White "Jonkman, Meinard"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "5"]
[Result "1-0"]
[Date "1958.12.15"]
[ECO "E63"]
[PlyCount "81"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[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. g3 0-0 5. Bg2 d6 6. Nf3 Nc6 7. 0-0 a6 8. b3 Rb8 9. Bb2 b5 10. cxb5 axb5 11. Rc1 b4 12. Na4 Na5 13. Qc2 c6 14. Ne1 Bg4 15. Nd3 Bh6 16. e3 Qd7 17. Qd2 Nd5 18. f4 Bh3 19. e4 Bxg2 20. Kxg2 Nf6 21. Rfe1 Rb5 22. Nxb4 Rh5 23. Kg1 g5 24. Nd3 Qh3 25. Qg2 Qxg2+ 26. Kxg2 gxf4 27. Nxf4 Bxf4 28. gxf4 d5 29. e5 Ne4 30. Nc5 f5 31. exf6 Rxf6 32. Nxe4 dxe4 33. Rxe4 Rfh6 34. Rh1 e6 35. Re5 Nb7 36. Rxh5 Rxh5 37. Rc1 Nd8 38. Rc5 Rh6 39. a4 Kf7 40. a5 Rg6+ 41. Kf3 1-0

[Event "NED-ch19"]
[White "Orbaan, Constant"]
[Black "Barendregt, Johan"]
[Site "Amsterdam"]
[Round "4"]
[Result "1-0"]
[Date "1958.12.13"]
[ECO "E73"]
[PlyCount "51"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[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. Be2 e5 6. dxe5 dxe5 7. Qxd8+ Kxd8 8. f4 c6 9. Nf3 Nbd7 10. fxe5 Ng4 11. e6 fxe6 12. Ng5 Bxc3+ 13. bxc3 Nge5 14. Nxe6+ Ke7 15. Nd4 h6 16. 0-0 b6 17. h4 c5 18. h5 Bb7 19. hxg6 Bxe4 20. g7 Rh7 21. Nf5+ Ke6 22. Ng3 Bg6 23. Bf4 Rxg7 24. Rae1 Bf7 25. Bf3 Rag8 26. Bd5+ 1-0

[Event "NED-ch19"]
[White "Cortlever, Nicolaas"]
[Black "Orbaan, Constant"]
[Site "Amsterdam"]
[Round "3"]
[Result "1-0"]
[Date "1958.12.12"]
[ECO "A49"]
[PlyCount "133"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. d4 d6 6. b3 e5 7. dxe5 Ng4 8. Nbd2 Nc6 9. Nc4 Be6 10. Rb1 Ngxe5 11. Nfxe5 dxe5 12. Ba3 Re8 13. Bxc6 bxc6 14. Qxd8 Rexd8 15. Rfd1 Bf5 16. Ne3 Bh3 17. Be7 Re8 18. Bc5 Bh6 19. f3 Bxe3+ 20. Bxe3 Bf5 21. Rd2 Red8 22. Rbd1 Rxd2 23. Rxd2 f6 24. g4 Be6 25. Rd3 Kf7 26. Rc3 Bd7 27. Kf2 a6 28. Rc4 g5 29. Bd2 Ke6 30. Ba5 Kd6 31. Rc3 Rc8 32. Rd3+ Ke7 33. Rd1 Be8 34. e4 Bf7 35. h4 gxh4 36. Rh1 Bg6 37. Ke2 Kd7 38. Rxh4 Re8 39. Bb4 Ke6 40. Rh1 Rd8 41. Ke3 Rd7 42. a4 Be8 43. a5 Rg7 44. Bc5 Rd7 45. c3 Rg7 46. Ke2 Rd7 47. b4 Rg7 48. c4 Rf7 49. Rh6 Rg7 50. g5 Bg6 51. gxf6 Kxf6 52. f4 Rd7 53. f5 Kg7 54. Be3 Be8 55. Re6 Kf7 56. Bc5 h5 57. Rxe5 h4 58. Re6 h3 59. Rh6 Kg7 60. Rxh3 Bf7 61. Ke3 Bxc4 62. Bd4+ Kf8 63. e5 c5 64. Bxc5+ Kg7 65. Bd4 c5 66. bxc5 Rb7 67. e6+ 1-0

[Event "NED-ch19"]
[White "Orbaan, Constant"]
[Black "Van Scheltinga, Theo D"]
[Site "Amsterdam"]
[Round "2"]
[Result "0-1"]
[Date "1958.12.11"]
[ECO "B27"]
[PlyCount "50"]
[EventDate "1958.12.10"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 1998"]
[Source "ChessBase"]
[SourceDate "1997.11.17"]
[SourceVersion "1"]
[SourceVersionDate "1997.11.17"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 g6 3. c3 Bg7 4. d4 cxd4 5. cxd4 d5 6. exd5 Nf6 7. Bb5+ Nbd7 8. Nc3 0-0 9. Bxd7 Bxd7 10. Qb3 Qb6 11. Qxb6 axb6 12. Ne5 Rfd8 13. Nd3 Ba4 14. Nb4 Bb3 15. Be3 Nxd5 16. Ncxd5 Bxd5 17. 0-0 Ra4 18. a3 Bb3 19. Rac1 Bxd4 20. Bxd4 Rxd4 21. Rc7 Rd2 22. Rxe7 Rxb2 23. Rxb7 Bc4 24. Rd1 Rxa3 25. h4 Rxb4 0-1

[Event "NED-ch19 Semifinal"]
[White "Van Weezel, Chr"]
[Black "Orbaan, Constant"]
[Site "Utrecht"]
[Round "3"]
[Result "0-1"]
[Date "1957.12.23"]
[ECO "B40"]
[PlyCount "72"]
[EventDate "1957.12.21"]
[EventType "tourn"]
[EventRounds "11"]
[EventCountry "NED"]
[SourceTitle "EXT 2012"]
[Source "ChessBase"]
[SourceDate "2011.11.24"]
[SourceVersion "1"]
[SourceVersionDate "2011.11.24"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. Nc3 a6 4. a4 Nc6 5. d4 cxd4 6. Nxd4 Qc7 7. Nb3 Nf6 8. Bd3 Be7 9. f4 d5 10. e5 Nd7 11. 0-0 Nc5 12. Nxc5 Bxc5+ 13. Kh1 Bd7 14. Bd2 g6 15. Be1 0-0-0 16. Bh4 Rde8 17. Bf6 Rhg8 18. Rf3 Be7 19. Bxe7 Rxe7 20. Be2 Ree8 21. Rd3 g5 22. g3 gxf4 23. gxf4 Ne7 24. b4 Nf5 25. b5 a5 26. Qe1 b6 27. Ne4 dxe4 28. Rc3 Qxc3 29. Qxc3+ Kb8 30. Rg1 Bc8 31. Qc6 Ka7 32. Rd1 Re7 33. Bf1 Bb7 34. Rd7 Rxd7 35. Qxd7 e3+ 36. Bg2 Rxg2 0-1

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Uhlmann, Wolfgang"]
[Site "Wageningen"]
[Round "17"]
[Result "0-1"]
[Date "1957.11.26"]
[ECO "A43"]
[PlyCount "80"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 c5 3. d5 exd5 4. exd5 d6 5. Nf3 Nf6 6. Nc3 Be7 7. Be2 0-0 8. 0-0 a6 9. a4 b6 10. Nd2 Nbd7 11. Nc4 Ne5 12. Ne3 Re8 13. f4 Ng6 14. Bd3 Bf8 15. Qf3 Ra7 16. Bd2 Rae7 17. Rfe1 Qc7 18. Qf1 Qb7 19. Kh1 Qa8 20. Rad1 Bb7 21. Bc4 Qc8 22. Bd3 Nh5 23. g3 Nf6 24. Bf5 Qa8 25. Qd3 b5 26. axb5 axb5 27. Ra1 Qb8 28. Bh3 b4 29. Ncd1 Nxd5 30. Bg2 Nf6 31. Nf2 Bxg2+ 32. Kxg2 Qb7+ 33. Kg1 d5 34. Qa6 Qxa6 35. Rxa6 d4 36. Ng2 Re2 37. Rd1 c4 38. f5 Ne5 39. Kf1 Nf3 40. Bf4 Rxc2 0-1

[Event "Wageningen Zonal"]
[White "Troianescu, Octavio"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "16"]
[Result "1/2-1/2"]
[Date "1957.11.24"]
[ECO "C41"]
[PlyCount "92"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. Bc4 Be7 6. 0-0 0-0 7. Re1 c6 8. a4 a5 9. b3 Qc7 10. Ba3 Nb6 11. Be2 Bg4 12. Qd2 Bxf3 13. Bxf3 Rfe8 14. Rad1 Nbd7 15. d5 cxd5 16. Nb5 Qc8 17. exd5 Nc5 18. Qe3 b6 19. Bxc5 bxc5 20. Na3 Qf5 21. Be4 Nxe4 22. Qxe4 Qxe4 23. Rxe4 f5 24. Re2 Reb8 25. Nc4 Kf7 26. Rd3 g5 27. f3 h5 28. g3 Rg8 29. h3 g4 30. hxg4 hxg4 31. Rh2 gxf3 32. Rxf3 Kf6 33. Ne3 f4 34. Rg2 e4 35. Rxf4+ Ke5 36. c3 Raf8 37. Nc4+ Kxd5 38. Rd2+ Kc6 39. Nxa5+ Kc7 40. Rxe4 Rxg3+ 41. Rg2 Rxg2+ 42. Kxg2 Bf6 43. Re3 d5 44. Re6 Bxc3 45. Rc6+ Kd7 46. Rxc5 Bxa5 1/2-1/2

[Event "Wageningen Zonal"]
[White "Clarke, Peter Hugh"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "15"]
[Result "1/2-1/2"]
[Date "1957.11.23"]
[ECO "B41"]
[PlyCount "80"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. c4 Nf6 6. Nc3 Bb4 7. Bd2 Bxc3 8. Bxc3 Nxe4 9. Qg4 Nxc3 10. Qxg7 Rf8 11. bxc3 Nc6 12. Bd3 Qc7 13. 0-0 Qe5 14. Qxe5 Nxe5 15. Bxh7 Rh8 16. Rfe1 Nxc4 17. Bd3 Na5 18. c4 Rh5 19. g4 Rh4 20. f3 Kd8 21. Kg2 b6 22. Kg3 Rh8 23. Rac1 Bb7 24. h4 Nc6 25. Nxc6+ Bxc6 26. Be4 Rc8 27. Rb1 b5 28. Bxc6 dxc6 29. c5 Ke7 30. Rbd1 Rcd8 31. Rxd8 Rxd8 32. g5 Rd5 33. Rc1 e5 34. h5 Ke6 35. h6 Kf5 36. Rh1 Rd8 37. h7 Rh8 38. Rh6 Kxg5 39. Rxc6 Rxh7 40. Rxa6 f5 1/2-1/2

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Lindblom, Per"]
[Site "Wageningen"]
[Round "14"]
[Result "1-0"]
[Date "1957.11.20"]
[ECO "A05"]
[PlyCount "87"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. d4 0-0 5. b3 c5 6. Bb2 Ne4 7. 0-0 d5 8. e3 Nc6 9. Nbd2 Bf5 10. Ne5 Nxd2 11. Nxc6 bxc6 12. Qxd2 Qb6 13. dxc5 Qxc5 14. Bxg7 Kxg7 15. Qd4+ Qxd4 16. exd4 a5 17. c4 e6 18. cxd5 cxd5 19. Rfc1 Rfb8 20. Bf3 a4 21. Bd1 axb3 22. axb3 Rxa1 23. Rxa1 Rb4 24. Ra4 Rxa4 25. bxa4 Bd3 26. f4 Kf8 27. Kf2 Ke7 28. Ke3 Bc4 29. Kd2 Kd6 30. Kc3 Kc6 31. Kb4 f6 32. a5 Ba6 33. Ba4+ Kd6 34. Bb5 Bb7 35. a6 Ba8 36. Ka5 e5 37. dxe5+ fxe5 38. fxe5+ Kxe5 39. Kb6 d4 40. Bd3 Kd6 41. Ka7 Bf3 42. Kb8 Kc5 43. a7 Kb4 44. Be2 1-0

[Event "Wageningen Zonal"]
[White "Kolarov, Atanas Stefanov"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "13"]
[Result "1/2-1/2"]
[Date "1957.11.17"]
[ECO "E88"]
[PlyCount "100"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[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. Qd2 cxd5 9. cxd5 Nh5 10. 0-0-0 f5 11. Kb1 Nd7 12. Nge2 b6 13. g4 fxg4 14. fxg4 Nf4 15. Nxf4 exf4 16. Bxf4 Nc5 17. Re1 Bxg4 18. Bg2 Rc8 19. Rhf1 Qd7 20. Bg3 b5 21. Rxf8+ Rxf8 22. Qe3 b4 23. Ne2 b3 24. a3 Bxb2 25. Kxb2 Na4+ 26. Kb1 Bxe2 27. Rxe2 Rc8 28. Be1 b2 29. Rc2 Rxc2 30. Kxc2 b1Q+ 31. Kxb1 Qb5+ 32. Bb4 a5 33. Bh3 axb4 34. Be6+ Kg7 35. Qd4+ Kh6 36. Qe3+ g5 37. axb4 Qxb4+ 38. Kc1 Qc5+ 39. Qxc5 Nxc5 40. Bf5 Nd3+ 41. Kd2 Ne5 42. Ke3 Kg7 43. h3 h6 44. Bc8 Kg6 45. Kf2 Kf6 46. Ke3 h5 47. Be6 Ng6 48. Bc8 Ke5 49. Bd7 Nf4 50. Bc8 Ng6 1/2-1/2

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Olafsson, Fridrik"]
[Site "Wageningen"]
[Round "12"]
[Result "0-1"]
[Date "1957.11.16"]
[ECO "B13"]
[PlyCount "56"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c6 2. d4 d5 3. exd5 cxd5 4. Bd3 Nc6 5. c3 Nf6 6. Bf4 g6 7. Nd2 Bg7 8. Ngf3 0-0 9. h3 Nh5 10. Bh2 Bh6 11. 0-0 Nf4 12. Bxf4 Bxf4 13. Re1 Bf5 14. Bxf5 gxf5 15. g3 Bh6 16. Ne5 Nxe5 17. Rxe5 e6 18. Nf3 Kh8 19. Ne1 Rg8 20. Nd3 Qf6 21. Qf3 Rg5 22. Nf4 Rag8 23. Kh1 Bf8 24. Re2 Bd6 25. Rae1 Qh6 26. Kh2 Rg4 27. Rxe6 fxe6 28. Rxe6 Rxf4 0-1

[Event "Wageningen Zonal"]
[White "Niephaus, Walter"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "11"]
[Result "1-0"]
[Date "1957.11.14"]
[ECO "B43"]
[PlyCount "117"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. g3 Bb4 7. Nde2 Nc6 8. Bg2 Nge7 9. Be3 Ne5 10. 0-0 0-0 11. h3 d6 12. Kh2 Bd7 13. f4 Nc4 14. Bc1 Rac8 15. a3 Bc5 16. Qd3 Ba7 17. b3 Na5 18. Bb2 Rfd8 19. Rac1 b5 20. f5 Nec6 21. f6 g6 22. Qd2 Kh8 23. Rf4 g5 24. Rg4 Rg8 25. Rxg5 Rxg5 26. Qxg5 Rg8 27. Qh5 Ne5 28. Nd1 Ng6 29. Qh6 Nc6 30. Nf4 Nxf4 31. Qxf4 Qb6 32. Nc3 Qf2 33. Qxf2 Bxf2 34. Ne2 Bc8 35. Rd1 Rd8 36. Bf3 Kg8 37. Rd3 Kf8 38. Kg2 Bb6 39. g4 Ne5 40. Bxe5 dxe5 41. Nc1 Bb7 42. g5 Rc8 43. c3 Bc5 44. b4 Bb6 45. Nb3 Ke8 46. Kg3 Rc4 47. Nd2 Rc8 48. Kg4 Bf2 49. Kh5 Be1 50. Nb3 Rxc3 51. Rxc3 Bxc3 52. Kh6 Kf8 53. Kxh7 Be1 54. g6 fxg6 55. Nc5 Bc8 56. Kxg6 Bh4 57. Bg4 Bf2 58. h4 a5 59. h5 1-0

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Larsen, Bent"]
[Site "Wageningen"]
[Round "10"]
[Result "0-1"]
[Date "1957.11.13"]
[ECO "A46"]
[PlyCount "44"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. Nf3 c5 3. dxc5 e6 4. e3 Bxc5 5. Be2 0-0 6. 0-0 d5 7. b3 Nc6 8. Bb2 Qe7 9. c4 dxc4 10. Bxc4 e5 11. Bb5 e4 12. Bxc6 bxc6 13. Ne5 Bd6 14. Nxc6 Bxh2+ 15. Kxh2 Qc7+ 16. Kg1 Qxc6 17. Qd4 Ba6 18. Rc1 Qe6 19. Na3 Rfe8 20. Rc7 Rad8 21. Qxa7 Ng4 22. Rc2 Qd6 0-1

[Event "Wageningen Zonal"]
[White "Trifunovic, Petar"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "9"]
[Result "1-0"]
[Date "1957.11.10"]
[ECO "E94"]
[PlyCount "83"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 0-0 6. Nf3 e5 7. 0-0 c6 8. Re1 Qb6 9. d5 c5 10. a3 a5 11. Rb1 Na6 12. Rf1 Ne8 13. Ne1 f5 14. Nd3 Nf6 15. f3 f4 16. Bd2 g5 17. Kh1 Rf7 18. b4 axb4 19. axb4 Nxb4 20. Nxb4 cxb4 21. Nb5 Bf8 22. Bxb4 Qd8 23. Ra1 Ra6 24. Na7 g4 25. Rxa6 bxa6 26. Nxc8 Qxc8 27. c5 gxf3 28. gxf3 dxc5 29. Rg1+ Rg7 30. Bc3 Bd6 31. Rxg7+ Kxg7 32. Qa1 Qb8 33. Bxa6 Qc7 34. Bf1 Kh8 35. Qa6 Qb8 36. Bb5 Kg7 37. Kg2 Kh8 38. Kf1 Qc7 39. Ba5 Qe7 40. Qc8+ Qf8 41. Qxf8+ Bxf8 42. Bc7 1-0

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Ivkov, Borislav"]
[Site "Wageningen"]
[Round "8"]
[Result "0-1"]
[Date "1957.11.09"]
[ECO "B26"]
[PlyCount "80"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 Rb8 6. Be3 d6 7. Qc1 b5 8. Nce2 b4 9. Nf3 Bg4 10. h3 Bxf3 11. Bxf3 Nd4 12. Bg2 e6 13. c3 bxc3 14. bxc3 Nxe2 15. Kxe2 Ne7 16. Qa3 0-0 17. Rhb1 Qc7 18. Kf1 Rb6 19. Kg1 Rfb8 20. Rxb6 Qxb6 21. Rc1 h5 22. Qa4 Nc6 23. Kh2 Qb5 24. Qa3 Rb6 25. d4 Bf8 26. dxc5 dxc5 27. c4 Qa6 28. Qd3 Nd4 29. Bxd4 Rd6 30. Qb3 Rxd4 31. Rc2 Qd6 32. h4 Be7 33. Kh3 Bf6 34. Qb5 Kg7 35. Qb1 Rd3 36. Qe1 Qd4 37. Qe2 Rd1 38. Bf3 Rb1 39. Rd2 Qa1 40. Bg2 Rh1+ 0-1

[Event "Wageningen Zonal"]
[White "Stahlberg, Gideon"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "7"]
[Result "1-0"]
[Date "1957.11.06"]
[ECO "E60"]
[PlyCount "85"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. 0-0 0-0 5. c4 d6 6. d4 Nc6 7. h3 Rb8 8. Be3 a6 9. Qc1 Nd7 10. Bh6 Nxd4 11. Nxd4 Bxd4 12. Bxf8 Qxf8 13. Nd2 Nc5 14. Qc2 Bf5 15. e4 Bd7 16. Kh2 Ba4 17. Nb3 Qg7 18. f4 Bxb2 19. Rab1 Bd4 20. Qe2 Bxb3 21. axb3 Nd7 22. h4 c5 23. Bh3 e6 24. Kg2 Re8 25. Qf3 Rb8 26. Rh1 Qf8 27. h5 Qd8 28. hxg6 hxg6 29. Qe2 Qa5 30. f5 exf5 31. exf5 gxf5 32. Bxf5 Nf6 33. b4 cxb4 34. Rhf1 Re8 35. Qd2 Qc5 36. Qg5+ Kf8 37. Qh6+ Ke7 38. Rbe1+ Be5 39. Bh3 Kd8 40. Rxf6 Qc6+ 41. Rf3 Qxc4 42. Rxe5 Qc2+ 43. Kh1 1-0

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Teschner, Rudolf"]
[Site "Wageningen"]
[Round "6"]
[Result "0-1"]
[Date "1957.11.05"]
[ECO "D79"]
[PlyCount "82"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. d4 Nf6 5. 0-0 0-0 6. c4 c6 7. cxd5 cxd5 8. Nc3 Ne4 9. Nxe4 dxe4 10. Ne5 Qd5 11. f3 Bxe5 12. dxe5 Qxe5 13. fxe4 Nc6 14. Bh6 Rd8 15. Qa4 Be6 16. Bf4 Qxb2 17. Rab1 Qxa2 18. Qxa2 Bxa2 19. Rxb7 e5 20. Bg5 Rdb8 21. Rc7 Rc8 22. Rxc8+ Rxc8 23. Bh3 Rb8 24. Bf6 Be6 25. Bxe6 fxe6 26. Rc1 Rb6 27. Rc5 a5 28. Bxe5 Nxe5 29. Rxe5 Ra6 30. Rc5 a4 31. Rc2 a3 32. Ra2 Kf7 33. e5 Ke7 34. Kf2 Kd7 35. Ke3 Kc6 36. Kd4 Kb5 37. Kc3 Ka4 38. Kc2 Rb6 39. Kc1 Kb3 40. Kb1 Rb8 41. Rc2 Rf8 0-1

[Event "Wageningen Zonal"]
[White "Hanninen, Veikko"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "5"]
[Result "1/2-1/2"]
[Date "1957.11.03"]
[ECO "C07"]
[PlyCount "38"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. d4 d5 3. Nd2 c5 4. Ngf3 Nf6 5. exd5 Nxd5 6. dxc5 Bxc5 7. Ne4 Be7 8. Bb5+ Bd7 9. Bxd7+ Qxd7 10. 0-0 Nf6 11. Nxf6+ Bxf6 12. Qe2 Nc6 13. Rd1 Qc7 14. c3 0-0 15. Bg5 Bxg5 16. Nxg5 h6 17. Ne4 Rfd8 18. Ng3 Rxd1+ 19. Rxd1 Rd8 1/2-1/2

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Dueckstein, Andreas"]
[Site "Wageningen"]
[Round "4"]
[Result "1/2-1/2"]
[Date "1957.11.02"]
[ECO "A81"]
[PlyCount "132"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. Nf3 f5 2. g3 Nf6 3. Bg2 d6 4. d4 e6 5. b3 Be7 6. Bb2 0-0 7. 0-0 Qe8 8. Nbd2 Nc6 9. e3 Bd7 10. Qe2 Qh5 11. e4 fxe4 12. Nxe4 e5 13. Nxf6+ Bxf6 14. Qc4+ Kh8 15. dxe5 dxe5 16. Nd2 Bh3 17. Bxh3 Qxh3 18. Ne4 Rad8 19. Rad1 Rxd1 20. Rxd1 Qg4 21. Rd2 Be7 22. Qe2 Qf5 23. a3 h5 24. Kg2 h4 25. gxh4 Bxh4 26. Ng3 Bxg3 27. hxg3 Rf6 28. Rd1 Rh6 29. Rh1 Rxh1 30. Kxh1 Nd4 31. Bxd4 exd4 32. Kg2 c5 33. Qd3 Qe5 34. Kf3 Kg8 35. Qe4 Qf6+ 36. Ke2 Qa6+ 37. Kd2 Qa5+ 38. Kd1 Qxa3 39. Qe8+ Kh7 40. Qh5+ Kg8 41. Qe8+ Kh7 42. Qh5+ Kg8 43. Qd5+ Kh7 44. Qxb7 Qa1+ 45. Ke2 Qc3 46. Qe4+ g6 47. Qd3 Qb4 48. g4 Qb7 49. Qf3 Qa6+ 50. Kd2 Qa5+ 51. Kd1 Qa1+ 52. Ke2 Qa6+ 53. Ke1 Qa1+ 54. Qd1 Qc3+ 55. Qd2 Qf3 56. Qe2 Qf4 57. Kf1 Kh6 58. Kg2 Kg5 59. f3 Kf6 60. Qa6+ Kg5 61. Qa5 Qe5 62. Qd2+ Qf4 63. Qe1 Kf6 64. Qa5 Qe5 65. Qd2 Qg5 66. Qd3 Qf4 1/2-1/2

[Event "Wageningen Zonal"]
[White "Szabo, Laszlo"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "3"]
[Result "1-0"]
[Date "1957.10.30"]
[ECO "C00"]
[PlyCount "57"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e6 2. Qe2 c5 3. Nf3 Nc6 4. g3 d6 5. Bg2 Nf6 6. 0-0 Be7 7. c3 0-0 8. d3 Bd7 9. Nbd2 Rc8 10. Ne1 b5 11. f4 Qa5 12. Nc2 b4 13. c4 Qc7 14. Nf3 a5 15. Ne3 Rfd8 16. g4 Nd4 17. Qf2 Bc6 18. g5 Nxf3+ 19. Qxf3 Nd7 20. Qh5 g6 21. Qh3 h5 22. f5 exf5 23. exf5 Bxg2 24. Qxg2 Ne5 25. Nd5 Qa7 26. fxg6 fxg6 27. Bf4 Rf8 28. Qe4 Rf5 29. Bxe5 1-0

[Event "Wageningen Zonal"]
[White "Orbaan, Constant"]
[Black "Alster, Ladislav"]
[Site "Wageningen"]
[Round "2"]
[Result "0-1"]
[Date "1957.10.28"]
[ECO "A80"]
[PlyCount "80"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 f5 2. Bg5 g6 3. e3 Bg7 4. Bc4 d5 5. Bb3 c5 6. c3 c4 7. Bc2 Nc6 8. Nd2 Nf6 9. Bxf6 Bxf6 10. f4 b5 11. Ndf3 Qb6 12. a3 Bd7 13. Qd2 e6 14. Ne5 Nxe5 15. dxe5 Bh4+ 16. Ke2 Be7 17. Nf3 a5 18. Nd4 Kf7 19. Rhb1 b4 20. Bd1 Rhb8 21. Qc1 Ra7 22. Kf2 h5 23. Kg1 bxa3 24. bxa3 Qc7 25. h3 Rab7 26. Bc2 h4 27. Kh2 g5 28. Qd1 Kg6 29. Nf3 Rxb1 30. Rxb1 Rxb1 31. Bxb1 Qb6 32. fxg5 Qxe3 33. Nxh4+ Kxg5 34. Nf3+ Kg6 35. g4 Bc6 36. gxf5+ exf5 37. Qf1 Qf4+ 38. Kg2 d4 39. cxd4 Bh4 40. Qe2 Qg3+ 0-1

[Event "Wageningen Zonal"]
[White "Donner, Jan Hein"]
[Black "Orbaan, Constant"]
[Site "Wageningen"]
[Round "1"]
[Result "1-0"]
[Date "1957.10.27"]
[ECO "B45"]
[PlyCount "81"]
[EventDate "1957.10.27"]
[EventType "tourn"]
[EventRounds "17"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Ndb5 Bb4 7. a3 Bxc3+ 8. Nxc3 d5 9. exd5 exd5 10. Bd3 0-0 11. 0-0 Bg4 12. f3 Be6 13. Bg5 Qb6+ 14. Kh1 Nd7 15. f4 f6 16. Qh5 f5 17. Qf3 Qc5 18. b4 Qd4 19. Nb5 Qb6 20. Rae1 Bf7 21. Nc3 Nd4 22. Qf2 Ne6 23. Nxd5 Qxf2 24. Rxf2 Nxg5 25. Ne7+ Kh8 26. Bxf5 Be8 27. Bxd7 Bxd7 28. Rd2 Nf3 29. gxf3 Bh3 30. Re4 g5 31. Kg1 Rxf4 32. Rxf4 gxf4 33. Kf2 Re8 34. Nd5 Rd8 35. Ke1 Rf8 36. Rd4 Rd8 37. c3 Re8+ 38. Kf2 a5 39. Nxf4 axb4 40. Nxh3 bxa3 41. Ra4 1-0

[Event "Przepiorka Memorial-02"]
[White "Orbaan, Constant"]
[Black "Winiwarter, Felix"]
[Site "Szczawno Zdroj"]
[Round "15"]
[Result "1/2-1/2"]
[Date "1957.08.15"]
[ECO "B26"]
[PlyCount "66"]
[EventDate "1957.07.27"]
[EventType "tourn"]
[EventRounds "15"]
[EventCountry "POL"]
[SourceTitle "EXT 2003"]
[Source "ChessBase"]
[SourceDate "2002.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2002.11.25"]
[SourceQuality "1"]

1. e4 c5 2. Nc3 Nc6 3. g3 g6 4. Bg2 Bg7 5. d3 d6 6. Be3 e6 7. Nge2 Nd4 8. 0-0 Ne7 9. Kh1 Nec6 10. Ng1 0-0 11. Qd2 Qa5 12. f4 f5 13. Qf2 Bd7 14. Rfc1 Rae8 15. Nd1 e5 16. c3 Ne6 17. Qd2 Kh8 18. Nf2 g5 19. Ne2 gxf4 20. gxf4 Qd8 21. exf5 exf4 22. Nxf4 Nxf4 23. Bxf4 Bxf5 24. Rg1 d5 25. Bh6 Bxh6 26. Qxh6 Re6 27. Qh5 Bg6 28. Qxd5 Qxd5 29. Bxd5 Re5 30. Bxc6 Rxf2 31. Rg2 Ree2 32. Bxb7 Rxb2 33. Rxf2 Rxf2 1/2-1/2

