[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.11.02"]
[Round "7"]
[White "Koomen, Willem"]
[Black "Van Doesburgh, Gerrit RD"]
[Result "1-0"]
[ECO "D60"]
[PlyCount "63"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. cxd5 Nxd5 7. Bxe7 Qxe7 8. Nf3 Nd7 9. Nxd5 exd5 10. Qb3 c6 11. Bd3 Nf6 12. 0-0 Ne4 13. Bxe4 dxe4 14. Nd2 Be6 15. Qc3 Bd5 16. Rfc1 Rad8 17. Qc5 Qxc5 18. Rxc5 f5 19. b4 Rf6 20. a4 f4 21. b5 fxe3 22. fxe3 Rdf8 23. Rf1 Rxf1+ 24. Nxf1 b6 25. Rc3 Rc8 26. Ng3 Kf8 27. Nh5 c5 28. Nf4 Bf7 29. dxc5 Rxc5 30. Rxc5 bxc5 31. a5 g5 32. b6 1-0

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.11.01"]
[Round "6"]
[White "Van Oosterwijk Bruyn, Jaap J"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "D22"]
[PlyCount "63"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. Qb3 Bxf3 7. gxf3 b5 8. Be2 Nd7 9. a4 b4 10. e4 c5 11. d5 exd5 12. Qxd5 Ngf6 13. Qg5 Qc7 14. Bf4 Qc6 15. Nd2 h6 16. Qf5 g6 17. Qh3 Nh5 18. Be3 Bg7 19. Nc4 Ne5 20. Rd1 Nxc4 21. Bxc4 Bxb2 22. Bd5 Qc8 23. Bxf7+ Kxf7 24. Rd7+ Kf6 25. Rg1 Qxd7 26. Qxd7 Ng7 27. f4 Rae8 28. e5+ Bxe5 29. Qc6+ Re6 30. fxe5+ Kf5 31. Qxc5 Rxe5 32. Qc2+ 1-0

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.10.31"]
[Round "5"]
[White "Koomen, Willem"]
[Black "Kramer, Haije J"]
[Result "0-1"]
[ECO "E16"]
[PlyCount "110"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Be7 7. 0-0 0-0 8. Bc3 d5 9. Ne5 Qc8 10. Nd2 Nbd7 11. Nxd7 Qxd7 12. Qc2 Rfd8 13. e3 Rac8 14. c5 c6 15. b4 Qc7 16. f4 Ng4 17. Rfe1 f5 18. h3 Nf6 19. Bf3 Ba6 20. g4 fxg4 21. hxg4 g5 22. Qb3 gxf4 23. e4 Kh8 24. Kh1 Rg8 25. Rg1 Rg6 26. Rg2 Rcg8 27. Rag1 Bd8 28. e5 Ne8 29. Rh2 Qg7 30. Qc2 Rh6 31. Rgg2 Bh4 32. Kg1 Bg3 33. Rxh6 Qxh6 34. Bb2 Qg6 35. Qxg6 hxg6 36. Nf1 Bxf1 37. Kxf1 b5 38. a4 Nc7 39. Bd1 Kg7 40. a5 Rh8 41. Bc3 Rh2 42. Bf3 Bh4 43. Ke2 Rh1 44. Kd3 Rh3 45. Ke2 Rh1 46. Kd3 Na6 47. Rd2 Rh3 48. Ke2 Be1 49. Kxe1 Rxf3 50. Rc2 Rg3 51. Kf2 g5 52. Be1 Rxg4 53. Kf3 Rg1 54. Re2 Kg6 55. Bf2 Rb1 0-1

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.10.30"]
[Round "4"]
[White "Van den Bosch, Johannes"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "A80"]
[PlyCount "91"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. Nf3 e6 3. e3 f5 4. Bd3 Bd6 5. 0-0 Qf6 6. c4 c6 7. Nc3 Nh6 8. Qb3 a6 9. cxd5 exd5 10. e4 fxe4 11. Bxe4 0-0 12. Bxd5+ Kh8 13. Ne4 Qg6 14. Nxd6 Qxd6 15. Bxh6 cxd5 16. Bd2 Nc6 17. Rac1 Bg4 18. Qxb7 Rac8 19. Ne5 Nxe5 20. dxe5 Qxe5 21. Rxc8 Bxc8 22. Qb4 Kg8 23. Be3 Qe4 24. Qc5 Re8 25. h3 Qc4 26. Qa7 d4 27. Bxd4 Bb7 28. Qxb7 Qxd4 29. Qb3+ Kh8 30. Rd1 Qa7 31. Qe3 Qf7 32. Qb3 Qa7 33. Qa4 Rf8 34. Qd4 Qf7 35. a3 h6 36. Rc1 Qe7 37. Rc6 Rf6 38. Rxf6 gxf6 39. Qe3 Qg7 40. Qe8+ Kh7 41. Qe4+ Kg8 42. Qc4+ Kh7 43. Qxa6 f5 44. Qb5 f4 45. Qf5+ Kg8 46. Qg4 1-0

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.10.29"]
[Round "3"]
[White "Koomen, Willem"]
[Black "Sammelius, Carel JR"]
[Result "0-1"]
[ECO "D36"]
[PlyCount "112"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. cxd5 exd5 6. e3 0-0 7. Qc2 h6 8. Bh4 c6 9. Bd3 Re8 10. Nf3 Nbd7 11. 0-0-0 Ne4 12. Bxe7 Qxe7 13. Bxe4 dxe4 14. Nd2 Nf6 15. Kb1 Be6 16. Ka1 Ng4 17. Ndxe4 Nxe3 18. fxe3 Bf5 19. Nf6+ Qxf6 20. e4 Bg6 21. Qe2 Rad8 22. Rhf1 Qh4 23. g3 Qh3 24. g4 h5 25. Rf4 hxg4 26. Rd3 Qh5 27. Qxg4 Qxg4 28. Rxg4 Rd6 29. Rd2 f5 30. e5 fxg4 31. exd6 Rd8 32. d5 Rxd6 33. b4 cxd5 34. Rxd5 Rxd5 35. Nxd5 Be4 36. Ne3 Bf3 37. Kb2 Kf7 38. Kc3 Ke6 39. Kd4 Kf6 40. Nf1 Kf5 41. Ke3 Ke5 42. Ng3 Bc6 43. Nf1 Bb5 44. Nd2 Kd5 45. a3 a6 46. Kf4 Kd4 47. Kxg4 Kd3 48. Nf3 Kc3 49. Kg5 Kb3 50. Kg6 Kxa3 51. Nd4 Kxb4 52. Kxg7 Bd3 53. h4 a5 54. h5 a4 55. h6 a3 56. Ne6 a2 0-1

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.10.28"]
[Round "2"]
[White "Koomen, Willem"]
[Black "Been, J."]
[Result "1/2-1/2"]
[ECO "D53"]
[PlyCount "108"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 h6 6. Bh4 Ne4 7. Bxe7 Qxe7 8. Bd3 Nxc3 9. bxc3 dxc4 10. Bxc4 e5 11. Nf3 exd4 12. cxd4 0-0 13. Qc2 Nd7 14. 0-0 c5 15. Rac1 b6 16. Bb5 Bb7 17. Qf5 Rad8 18. Bxd7 Rxd7 19. dxc5 Rd5 20. Qf4 Rxc5 21. Rxc5 Qxc5 22. Nd4 Qd5 23. Qg3 Qg5 24. Qxg5 hxg5 25. Rc1 Rc8 26. Rxc8+ Bxc8 27. Kf1 Kf8 28. Ke2 Bd7 29. Kd3 Ke7 30. Kc4 a6 31. Kd5 g6 32. a3 Ba4 33. Nc6+ Kf6 34. g3 g4 35. Nd8 a5 36. e4 Bb3+ 37. Kd6 b5 38. Nc6 a4 39. Nd4 Bc4 40. e5+ Kg5 41. Kc5 Bf1 42. Kb4 Bd3 43. Kc3 Bc4 44. Kb4 Bf1 45. Nxb5 Kf5 46. Kxa4 Kxe5 47. Kb4 Ke4 48. Nd6+ Kf3 49. Nxf7 Kxf2 50. Ne5 Kg2 51. Nxg4 Kh3 52. Ne5 Kxh2 53. g4 Kg3 54. a4 g5 1/2-1/2

[Event "NED-ch Voorwedstrijden Leiden-C"]
[Site "Leiden"]
[Date "1946.10.26"]
[Round "1"]
[White "Tummers, Leo J"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "D22"]
[PlyCount "77"]
[EventDate "1946.10.26"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 dxc4 3. Nf3 a6 4. e3 Bg4 5. Bxc4 e6 6. Qb3 Bxf3 7. gxf3 b5 8. Be2 Nd7 9. a4 b4 10. Nd2 c5 11. dxc5 Nxc5 12. Qc2 Nf6 13. b3 Rc8 14. Nc4 Be7 15. Bb2 0-0 16. Rd1 Qc7 17. Be5 Qa7 18. Qb2 Rfd8 19. 0-0 Ne8 20. Qb1 Bf6 21. Rxd8 Rxd8 22. Rd1 Qe7 23. Rxd8 Qxd8 24. Qd1 Qc8 25. Nb6 Qc6 26. Bxf6 gxf6 27. a5 Nd6 28. Qd4 Nxb3 29. Qg4+ Kh8 30. Qxb4 Nc5 31. Qc3 Kg7 32. Bxa6 Nb5 33. Bxb5 Qxb5 34. Qd2 Nb7 35. Qc3 Qb1+ 36. Kg2 Qb5 37. Nc4 Qc5 38. a6 Nd6 39. a7 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.13"]
[Round "9"]
[White "Koomen, Willem"]
[Black "Stoltz, Gosta"]
[Result "1-0"]
[ECO "D40"]
[PlyCount "85"]
[EventDate "1946.01.05"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c5 4. e3 Nf6 5. Nf3 Nc6 6. a3 a6 7. dxc5 Bxc5 8. b4 Ba7 9. Bb2 0-0 10. Be2 dxc4 11. Bxc4 Qc7 12. Qe2 b5 13. Bd3 Bb7 14. Rc1 Rac8 15. Ne4 Nxe4 16. Bxe4 Qe7 17. 0-0 Bb8 18. Rfd1 f5 19. Bb1 e5 20. Ba2+ Kh8 21. h4 h6 22. Rc5 Rcd8 23. Rdc1 e4 24. Rxc6 Bxc6 25. Rxc6 Rd6 26. Ne5 Rxc6 27. Nxc6 Qxh4 28. Nxb8 Rxb8 29. Qc2 Qd8 30. Be6 Qd3 31. Qxd3 exd3 32. Kf1 Rf8 33. Ke1 Kh7 34. Kd2 g5 35. Kxd3 Kg6 36. f3 Re8 37. Bd5 h5 38. e4 f4 39. e5 Kf5 40. Bf7 Rd8+ 41. Bd4 Rc8 42. e6 Rc7 43. Bb6 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.12"]
[Round "8"]
[White "Koomen, Willem"]
[Black "Kramer, Haije J"]
[Result "1-0"]
[ECO "E33"]
[PlyCount "81"]
[EventDate "1946.01.05"]
[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 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. Nf3 d6 6. a3 Bxc3+ 7. Qxc3 a5 8. b3 0-0 9. Bb2 Re8 10. Rd1 Qe7 11. g3 e5 12. d5 Nb8 13. Bg2 Ne4 14. Qc2 f5 15. 0-0 Rf8 16. Ne1 Nf6 17. Nd3 Nbd7 18. f3 b5 19. cxb5 Nxd5 20. Nxe5 Ne3 21. Nc6 Qf7 22. Qc3 Nxd1 23. Rxd1 Nf6 24. e4 fxe4 25. fxe4 Be6 26. e5 Ng4 27. exd6 cxd6 28. Rxd6 Bxb3 29. h3 Nf6 30. Ne5 Ne4 31. Nxf7 Nxc3 32. Bxc3 Rac8 33. Bxa5 Rc1+ 34. Kh2 Bxf7 35. b6 Rb1 36. b7 Rb2 37. Bc7 Bg6 38. Rb6 Rxg2+ 39. Kxg2 Be4+ 40. Kg1 Bxb7 41. Rxb7 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.11"]
[Round "7"]
[White "Van Scheltinga, Theo D"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "C58"]
[PlyCount "87"]
[EventDate "1946.01.05"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. Ng5 d5 5. exd5 Na5 6. d3 Bd6 7. Nc3 Nxc4 8. dxc4 Bb4 9. Qd3 0-0 10. Bd2 h6 11. Nge4 Nxe4 12. Nxe4 Be7 13. f3 f5 14. Nf2 Bc5 15. Be3 e4 16. fxe4 fxe4 17. Qe2 Bxe3 18. Qxe3 Qf6 19. c3 Qb6 20. Qxb6 axb6 21. Nd1 Bg4 22. Ne3 Bh5 23. Rf1 Rxf1+ 24. Nxf1 Kf7 25. Ne3 Ke7 26. Kd2 Bg6 27. a4 Kd6 28. b3 Rf8 29. Rf1 Rxf1 30. Nxf1 Ke5 31. g3 c6 32. dxc6 bxc6 33. c5 bxc5 34. Ne3 Kd6 35. Nc4+ Kc7 36. Ke3 Bh7 37. Nd2 Kb6 38. Nxe4 c4 39. b4 Bg8 40. Kd4 Be6 41. a5+ Ka7 42. Kc5 Bc8 43. Nd6 Bd7 44. Nxc4 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.10"]
[Round "6"]
[White "O'Kelly de Galway, Alberic"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "E20"]
[PlyCount "77"]
[EventDate "1946.01.05"]
[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 e6 3. Nc3 Bb4 4. Qd3 d5 5. a3 Bxc3+ 6. bxc3 0-0 7. Nf3 c5 8. g3 b6 9. cxd5 exd5 10. Bg2 Ba6 11. Qf5 Nbd7 12. Ne5 Re8 13. Bf4 cxd4 14. cxd4 Rc8 15. 0-0 Bxe2 16. Rfe1 Bc4 17. Bh3 Re7 18. Nxd7 Rxd7 19. Qe5 Rcc7 20. Bxd7 Rxd7 21. Bg5 Kf8 22. Bxf6 gxf6 23. Qf5 Kg7 24. Re3 Re7 25. Rae1 Qd7 26. Qxd7 Rxd7 27. Re7 Rxe7 28. Rxe7 a5 29. Ra7 Kg6 30. Kg2 Kg7 31. Kf3 Kg6 32. Ke3 Kg5 33. Kd2 Bb3 34. Rb7 a4 35. Rxb6 Kf5 36. f3 h5 37. g4+ hxg4 38. fxg4+ Kxg4 39. Rxb3 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.09"]
[Round "5"]
[White "Vlagsma, Chris"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "D49"]
[PlyCount "65"]
[EventDate "1946.01.05"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nf3 c6 4. e3 Nf6 5. Nc3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 Ng4 12. Nbxd4 Qa5+ 13. Bd2 Qd5 14. Qe2 Bb7 15. Bc4 Qe4 16. Bd3 Qxe2+ 17. Bxe2 Ngxe5 18. Bc3 Bd6 19. Rd1 Ke7 20. 0-0 Rhc8 21. Rfe1 g6 22. Nxe5 Nxe5 23. f4 Nc4 24. f5 Ne3 25. f6+ Kxf6 26. Nc6+ Kg5 27. Rxd6 Nf5 28. Rd7 Bxc6 29. Rxf7 h5 30. Bd2+ Kh4 31. Rf1 e5 32. R1xf5 gxf5 33. Rg7 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.08"]
[Round "4"]
[White "Koomen, Willem"]
[Black "De Groot, Adriaan"]
[Result "1-0"]
[ECO "D95"]
[PlyCount "101"]
[EventDate "1946.01.05"]
[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 g6 3. c4 Bg7 4. Nc3 d5 5. e3 0-0 6. Qb3 c6 7. Bd2 e6 8. Bd3 Nbd7 9. 0-0 Nb6 10. cxd5 exd5 11. Ne2 a5 12. a4 Ne4 13. Ng3 Nxd2 14. Nxd2 Re8 15. Qc2 Nd7 16. Nb3 Qh4 17. Rfe1 Nf6 18. Nd2 Ng4 19. Nf3 Qd8 20. h3 Nh6 21. Rab1 f5 22. Qd2 Bf8 23. Ne2 Nf7 24. Qc2 Bb4 25. Red1 Qf6 26. Nf4 Bd6 27. h4 Re7 28. Rbc1 Be6 29. g3 Rae8 30. Kg2 Bc8 31. Qc3 Bb4 32. Qb3 Nh6 33. Rc2 Ng4 34. Rdc1 Be6 35. Ng5 Bf7 36. Re2 Bd6 37. Rce1 h6 38. Nf3 g5 39. hxg5 hxg5 40. Nh3 Nxe3+ 41. Rxe3 g4 42. Rxe7 Rxe7 43. Rxe7 gxf3+ 44. Kh2 Bxe7 45. Qxb7 Kg7 46. Bxf5 Bd6 47. Qd7 c5 48. Bg4 cxd4 49. Bh5 Be5 50. Qg4+ Kh6 51. Bxf7 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.07"]
[Round "3"]
[White "Van den Tol, Theo P"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "D44"]
[PlyCount "107"]
[EventDate "1946.01.05"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. Nf3 Nf6 5. Bg5 dxc4 6. a4 Bb4 7. e4 b5 8. Qb1 Bb7 9. e5 h6 10. exf6 gxf6 11. Be3 Nd7 12. Be2 Qc7 13. Nd2 a6 14. Bf3 f5 15. g3 0-0-0 16. Qc2 Nb6 17. axb5 cxb5 18. 0-0-0 Bxf3 19. Nxf3 Bxc3 20. Qxc3 Nd5 21. Qa3 Kb7 22. Bd2 c3 23. bxc3 Rc8 24. Kb2 Nb6 25. Ka1 Nc4 26. Qb4 Nxd2 27. Nxd2 Qxc3+ 28. Qxc3 Rxc3 29. Kb2 Rhc8 30. Rc1 b4 31. Nb3 Rf3 32. Nc5+ Ka7 33. Rc2 Rd8 34. Ra1 Rd6 35. Nb3 Kb6 36. Ra4 a5 37. Nd2 Kb5 38. Rxa5+ Kxa5 39. Nxf3 Kb5 40. Kb3 f6 41. Rc5+ Kb6 42. Kxb4 Rd8 43. Rc2 Re8 44. Kc4 Kc6 45. Kd3+ Kd6 46. Ra2 e5 47. Ra6+ Kd5 48. Ra5+ Kd6 49. Nh4 f4 50. Nf5+ Kd7 51. Ra7+ Kc6 52. Ra6+ Kd7 53. Rxf6 fxg3 54. hxg3 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.06"]
[Round "2"]
[White "Van Steenis, Hendrik Jan"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "C58"]
[PlyCount "65"]
[EventDate "1946.01.05"]
[EventType "tourn"]
[EventRounds "9"]
[EventCountry "NED"]
[SourceTitle "MCD"]
[Source "ChessBase"]
[SourceDate "1999.07.01"]
[SourceVersion "1"]
[SourceVersionDate "1999.07.01"]
[SourceQuality "1"]

1. e4 e5 2. Bc4 Nf6 3. Nf3 Nc6 4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Qf3 Qc7 9. Bd3 Be7 10. b3 0-0 11. Ba3 Bxa3 12. Nxa3 h6 13. h4 Re8 14. Ne4 Nxe4 15. Bxe4 Be6 16. b4 Nb7 17. b5 Na5 18. g4 Rab8 19. g5 hxg5 20. hxg5 Kf8 21. Ke2 cxb5 22. Qf6 Bg4+ 23. f3 gxf6 24. gxf6 Kg8 25. Rag1 Qd7 26. Bh7+ Kf8 27. Rxg4 Qxg4 28. fxg4 Rb6 29. g5 a6 30. Be4 Kg8 31. Rh7 b4 32. Rg7+ Kf8 33. Bh7 1-0

[Event "Hoogovens"]
[Site "Beverwijk"]
[Date "1946.01.05"]
[Round "1"]
[White "Koomen, Willem"]
[Black "Cortlever, Nicolaas"]
[Result "1/2-1/2"]
[ECO "D95"]
[PlyCount "73"]
[EventDate "1946.01.05"]
[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 g6 3. Nc3 d5 4. e3 c6 5. Qb3 Bg7 6. Nf3 0-0 7. Bd2 e6 8. Bd3 b6 9. cxd5 exd5 10. 0-0 Be6 11. Qa3 Nbd7 12. Rac1 c5 13. dxc5 Nxc5 14. Be2 Nfe4 15. Rfd1 Qf6 16. Be1 Rfd8 17. b4 Nb7 18. Nxe4 dxe4 19. Bc3 Qe7 20. Rxd8+ Nxd8 21. Nd4 Bd5 22. Ba6 Ne6 23. Nxe6 Qxe6 24. Bxg7 Kxg7 25. Qc3+ Qf6 26. a3 Rd8 27. Qxf6+ Kxf6 28. Rd1 Ke5 29. f4+ exf3 30. gxf3 Rd6 31. e4 Bb3 32. f4+ Ke6 33. Rxd6+ Kxd6 34. Kf2 h6 35. Ke3 g5 36. e5+ Ke6 37. Bc8+ 1/2-1/2

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.05.18"]
[Round "3"]
[White "Koomen, Willem"]
[Black "Van den Bosch, Johannes"]
[Result "1/2-1/2"]
[ECO "A85"]
[PlyCount "88"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Ne4 7. Bxe7 Qxe7 8. Qc2 c6 9. Bd3 f5 10. Ne5 Nd7 11. 0-0 Nxe5 12. dxe5 Bd7 13. a3 Rad8 14. Ne2 Nc5 15. b4 Nxd3 16. Qxd3 Be8 17. c5 Bh5 18. Nf4 Bf7 19. Qd4 g5 20. Ne2 Kh8 21. a4 Qe8 22. f4 Bh5 23. Nc3 Rg8 24. Rf2 gxf4 25. exf4 Qg6 26. Raa2 Qh6 27. Rab2 a6 28. b5 axb5 29. axb5 Ra8 30. Ra2 Rxa2 31. Rxa2 Bf3 32. Rf2 Qh3 33. Qd2 Bxg2 34. Rxg2 Rxg2+ 35. Qxg2 Qxc3 36. Qg5 Qxc5+ 37. Kg2 Qf8 38. bxc6 bxc6 39. Kf2 c5 40. Ke2 c4 41. Ke3 c3 42. Kd3 d4 43. h4 Qe8 44. h5 Qb5+ 1/2-1/2

[Event "NED-chT 4041"]
[Site "Netherlands"]
[Date "1941.01.25"]
[Round "5.2"]
[White "Koomen, Willem"]
[Black "Kmoch, Hans"]
[Result "0-1"]
[ECO "E33"]
[PlyCount "55"]
[EventDate "1940.10.19"]
[EventType "team-tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2014"]
[Source "ChessBase"]
[SourceDate "2013.11.20"]
[SourceVersion "1"]
[SourceVersionDate "2013.11.20"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam Max Euwe"]
[BlackTeam "Amsterdam ASC"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 Nc6 5. Nf3 d6 6. a3 Bxc3+ 7. Qxc3 a5 8. b3 Ne4 9. Qc2 f5 10. Bb2 0-0 11. g3 Bd7 12. Bg2 Qe7 13. 0-0 Rae8 14. d5 Nd8 15. b4 e5 16. Nh4 Ng5 17. c5 axb4 18. axb4 e4 19. Qc3 f4 20. cxd6 cxd6 21. Qc7 f3 22. exf3 exf3 23. Nxf3 Nxf3+ 24. Bxf3 Rxf3 25. Rfe1 Qf7 26. Rxe8+ Qxe8 27. Kg2 Rf7 28. Qxd6 0-1

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.01.06"]
[Round "7"]
[White "Bergsma, Klaas"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "A84"]
[PlyCount "81"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. c4 e6 2. Nc3 d5 3. d4 c6 4. e3 f5 5. g4 Nh6 6. gxf5 Nxf5 7. Nf3 Nd7 8. Bd3 Nf6 9. Qc2 g6 10. Bd2 Bg7 11. 0-0 0-0 12. Rad1 Ng4 13. Bc1 Qc7 14. Ne5 Bxe5 15. dxe5 Nxe5 16. f4 Nxc4 17. Bxc4 dxc4 18. Ne4 b5 19. b3 cxb3 20. Qxb3 a5 21. Bb2 a4 22. Qb4 c5 23. Nxc5 h6 24. e4 Ng7 25. Be5 Qa5 26. Qb2 Ra7 27. Rf3 b4 28. Qd4 Kh7 29. Qd6 Raf7 30. Qc6 Nh5 31. Nxe6 Bxe6 32. Qxe6 Qa7+ 33. Kh1 Qe7 34. Qxe7 Rxe7 35. Bd6 Rd7 36. Rd5 Rfd8 37. Bxb4 Rxd5 38. exd5 Rxd5 39. a3 Rd1+ 40. Kg2 Rd2+ 41. Bxd2 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "4"]
[White "Euwe, Max"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "C78"]
[PlyCount "79"]
[EventDate "1941.05.??"]
[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 a6 4. Ba4 Nf6 5. 0-0 Bc5 6. c3 0-0 7. d4 Bb6 8. Bg5 h6 9. Bh4 d6 10. Bxc6 bxc6 11. dxe5 dxe5 12. Qa4 Qd6 13. Na3 Qe6 14. Nc4 Nd7 15. Na5 Nc5 16. Qxc6 Bd7 17. Qxe6 Bxe6 18. Be7 Nxe4 19. Bxf8 Rxf8 20. Nc6 f6 21. Rae1 Nc5 22. b3 Kf7 23. Rd1 Bf5 24. b4 Na4 25. c4 Be4 26. b5 Bxc6 27. bxc6 Nc5 28. Nd2 Ne6 29. Nb3 Bd4 30. Nxd4 Nxd4 31. f4 Ne2+ 32. Kf2 Nxf4 33. Rd7+ Ke6 34. Rb1 Ng6 35. Rb7 Rc8 36. Rdxc7 Rxc7 37. Rxc7 Ne7 38. c5 g6 39. Rd7 Nc8 40. Rd8 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "6"]
[White "Koomen, Willem"]
[Black "De Jong, Theodoor"]
[Result "1-0"]
[ECO "E37"]
[PlyCount "59"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Bxc3+ 6. Qxc3 Ne4 7. Qc2 c5 8. dxc5 Nc6 9. cxd5 exd5 10. Nf3 Bf5 11. b4 0-0 12. Qb2 Re8 13. Be3 Rc8 14. g3 b6 15. cxb6 Nd6 16. b7 Nxb7 17. Rd1 Be4 18. Bg2 Nd6 19. Bc5 Nc4 20. Qc3 a5 21. 0-0 axb4 22. axb4 Ra8 23. b5 Ne7 24. Nd4 Bxg2 25. Kxg2 Qc8 26. Qb4 Nf5 27. Rfe1 Ra2 28. Nxf5 Qxf5 29. e4 Rxe4 30. Qxc4 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "1"]
[White "Koomen, Willem"]
[Black "Kmoch, Hans"]
[Result "0-1"]
[ECO "E11"]
[PlyCount "84"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. a3 Be7 6. Nf3 0-0 7. e4 dxe4 8. Nxe4 Nc6 9. Be3 Nxe4 10. Qxe4 f5 11. Qc2 f4 12. Bd2 Nxd4 13. Nxd4 Qxd4 14. Bc3 Qc5 15. 0-0-0 Qh5 16. g4 Qxg4 17. Bd3 Qh5 18. Rhg1 e5 19. Bxe5 Qxe5 20. Bxh7+ Kh8 21. Rd5 Qf6 22. Rh5 Be6 23. Bf5+ Kg8 24. Bxe6+ Qxe6 25. Qh7+ Kf7 26. Qxg7+ Ke8 27. Re5 Qxc4+ 28. Kb1 Qf7 29. h4 Rd8 30. Qg4 Rd7 31. Rd1 Rxd1+ 32. Qxd1 Qf6 33. Qd5 c6 34. Qd4 Qxh4 35. Qxa7 Qf6 36. Re1 Qf5+ 37. Ka1 Qd7 38. Qb8+ Kf7 39. Qxf4+ Bf6 40. Rh1 Rg8 41. Rh6 Rg1+ 42. Ka2 Qe6+ 0-1

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "5"]
[White "Koomen, Willem"]
[Black "Van Doesburgh, Gerrit RD"]
[Result "1-0"]
[ECO "D63"]
[PlyCount "87"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 0-0 6. Nf3 Nbd7 7. Rc1 c6 8. a3 h6 9. Bh4 Ne4 10. Bxe7 Qxe7 11. Qc2 Nd6 12. cxd5 exd5 13. Bd3 Re8 14. 0-0 Nf8 15. Ne5 Be6 16. Ne2 f6 17. Ng6 Nxg6 18. Bxg6 Bf7 19. Bh7+ Kh8 20. Bd3 Qd7 21. Ng3 Re7 22. Qc5 Ne4 23. Bxe4 dxe4 24. Nf5 Ree8 25. Nd6 Red8 26. Nxe4 f5 27. Ng3 Bd5 28. Rfe1 Re8 29. f3 f4 30. exf4 Qf7 31. f5 h5 32. Qc3 h4 33. Ne4 Qxf5 34. Nd6 Rxe1+ 35. Rxe1 Qg6 36. Nxb7 h3 37. g3 Qf7 38. Nd6 Qg6 39. Ne4 Rf8 40. Qe3 Qf5 41. Kf2 Rb8 42. b4 Re8 43. Qg5 Qe6 44. Qh5+ 1-0

[Event "Baarn"]
[Site "Baarn"]
[Date "1941.??.??"]
[Round "2"]
[White "Kramer, Haije J"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "A84"]
[PlyCount "69"]
[EventDate "1941.05.??"]
[EventType "tourn"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2002"]
[Source "ChessBase"]
[SourceDate "2001.11.25"]
[SourceVersion "1"]
[SourceVersionDate "2001.11.25"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. Nc3 c6 4. e3 f5 5. f4 Nh6 6. Nf3 Be7 7. Be2 0-0 8. 0-0 Kh8 9. Bd2 Rg8 10. g3 Nf7 11. c5 g5 12. b4 Nd7 13. b5 gxf4 14. exf4 Nf6 15. bxc6 bxc6 16. Qa4 Qc7 17. Rab1 Ne4 18. Nxe4 dxe4 19. Ne5 Nxe5 20. fxe5 Qd7 21. Be3 Qc7 22. Rb3 Bd7 23. Rfb1 Rgb8 24. Bd2 Bd8 25. Ba6 Rxb3 26. Qxb3 Kg8 27. Bc4 Kf7 28. Rf1 Ke7 29. Qe3 Be8 30. Qh6 Bf7 31. Qxh7 Kf8 32. Qh8+ Ke7 33. Qg7 Ke8 34. Bh6 Be7 35. Qh8+ 1-0

[Event "NED-chT 3940 Relegation"]
[Site "Netherlands"]
[Date "1940.05.05"]
[Round "1.4"]
[White "Koomen, Willem"]
[Black "Felderhof, Hendrik Willem"]
[Result "0-1"]
[ECO "D70"]
[PlyCount "98"]
[EventDate "1940.05.05"]
[EventType "team"]
[EventRounds "1"]
[EventCountry "NED"]
[SourceTitle "EXT 2013"]
[Source "ChessBase"]
[SourceDate "2012.11.22"]
[SourceVersion "1"]
[SourceVersionDate "2012.11.22"]
[SourceQuality "1"]
[WhiteTeam "Amsterdam Max Euwe"]
[BlackTeam "Bussum"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. c4 g6 3. f3 d5 4. cxd5 Nxd5 5. e4 Nf6 6. Be3 Bg7 7. Nc3 0-0 8. Qd2 Re8 9. Rd1 b6 10. Qc1 Bb7 11. g3 Nbd7 12. Nge2 e6 13. Nf4 Rc8 14. h4 Qe7 15. h5 c5 16. d5 exd5 17. Nfxd5 Nxd5 18. Nxd5 Qe5 19. Bf4 Qxb2 20. Qxb2 Bxb2 21. Bb5 Bc6 22. Nc7 Rxc7 23. Bxc6 Rxc6 24. Rxd7 a6 25. Kd1 b5 26. Kc2 Bd4 27. h6 Rce6 28. Bc7 R6e7 29. Rxe7 Rxe7 30. Bd6 Re6 31. Bc7 f6 32. Kd3 Rc6 33. Ba5 Be5 34. f4 c4+ 35. Kc2 Bd6 36. Rd1 Kf7 37. e5 fxe5 38. fxe5 Bxe5 39. Rd7+ Ke8 40. Rxh7 Rf6 41. Bb4 Rf2+ 42. Kd1 Rf7 43. Rxf7 Kxf7 44. g4 Bf4 45. h7 Kg7 46. Bf8+ Kxh7 47. Ke2 Kg8 48. Bc5 Kf7 49. Bd4 Ke6 0-1

[Event "BEL-NED m"]
[Site "Brussels"]
[Date "1939.04.30"]
[Round "2.6"]
[White "Koomen, Willem"]
[Black "Sapira, Emmanuel"]
[Result "1-0"]
[ECO "D95"]
[PlyCount "54"]
[EventDate "1939.04.29"]
[EventType "team-match"]
[EventRounds "2"]
[EventCountry "BEL"]
[SourceTitle "EXT 2021"]
[Source "ChessBase"]
[SourceDate "2020.10.23"]
[SourceVersion "1"]
[SourceVersionDate "2020.10.23"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Belgium"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "BEL"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. e3 Bg7 5. Qb3 c6 6. Nf3 0-0 7. Bd2 e6 8. Bd3 Nbd7 9. 0-0 Qe7 10. e4 dxc4 11. Bxc4 h6 12. Rfe1 Rd8 13. Bf4 Nb6 14. Rad1 Nxc4 15. Qxc4 Nd7 16. a4 Re8 17. a5 a6 18. Be3 Bf8 19. e5 Qb4 20. Qa2 b6 21. axb6 Nxb6 22. Ne4 Nd5 23. Rc1 Qb5 24. Bxh6 f5 25. exf6 Nb4 26. Qb1 Rd8 27. f7+ Kh8 1-0

[Event "NED Team-ch 1936/37 Relegation"]
[Site "Netherlands"]
[Date "1937.09.26"]
[Round "1.2"]
[White "Oskam, Gerard"]
[Black "Koomen, Willem"]
[Result "1/2-1/2"]
[ECO "C29"]
[PlyCount "49"]
[EventDate "1937.09.26"]
[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 "Rotterdam NRSV"]
[BlackTeam "Amsterdam Max Euwe"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nc3 Nf6 3. f4 d5 4. fxe5 Nxe4 5. Nf3 Bb4 6. Be2 0-0 7. 0-0 c5 8. Qe1 Be6 9. d3 d4 10. dxe4 dxc3 11. bxc3 Ba5 12. Qg3 Kh8 13. Nh4 Bxc3 14. Qxc3 Qxh4 15. Qxc5 Nc6 16. Bd3 Qh5 17. Bb2 Rfe8 18. Rf2 Rac8 19. Bb5 a6 20. Bxc6 Rxc6 21. Qe3 Rec8 22. Qd3 h6 23. Bd4 b5 24. c3 Kh7 25. Qe3 1/2-1/2

[Event "Munich Schach-Olympia (No FIDE event)"]
[Site "Munich"]
[Date "1936.08.29"]
[Round "17"]
[White "Koomen, Willem"]
[Black "Staldi, Cherubino"]
[Result "0-1"]
[ECO "D68"]
[PlyCount "62"]
[EventDate "1936.08.17"]
[EventType "team-tourn"]
[EventRounds "21"]
[EventCountry "GER"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Italy"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "ITA"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 5. e3 Be7 6. Nf3 0-0 7. Rc1 c6 8. Bd3 dxc4 9. Bxc4 Nd5 10. Bxe7 Qxe7 11. 0-0 Nxc3 12. Rxc3 e5 13. Qc2 e4 14. Nd2 Nf6 15. Rc1 Bf5 16. f4 a5 17. Bb3 a4 18. Bxa4 Nd5 19. Ra3 b5 20. Bb3 Rxa3 21. Bxd5 Rxe3 22. Bxc6 Re2 23. Qc5 Qh4 24. Rf1 Qg4 25. Rf2 Rxf2 26. Kxf2 Qxf4+ 27. Ke1 Qe3+ 28. Kd1 Bg4+ 29. Kc2 Qd3+ 30. Kc1 e3 31. Nf3 Bf5 0-1

[Event "Munich Schach-Olympia (No FIDE event)"]
[Site "Munich"]
[Date "1936.08.26"]
[Round "14"]
[White "Magno da Cruz, Mecenas"]
[Black "Koomen, Willem"]
[Result "0-1"]
[ECO "E17"]
[PlyCount "74"]
[EventDate "1936.08.17"]
[EventType "team-tourn"]
[EventRounds "21"]
[EventCountry "GER"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]
[WhiteTeam "Brazil"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "BRA"]
[BlackTeamCountry "NED"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Be7 6. 0-0 d6 7. Nc3 Nbd7 8. Qc2 e5 9. d5 a5 10. e4 0-0 11. Bd2 Nh5 12. Ne2 Nc5 13. Be3 Bc8 14. Nd2 g6 15. Bh6 Ng7 16. f4 f5 17. fxe5 dxe5 18. Nc3 Nb7 19. Be3 Nd6 20. a4 Bg5 21. Rae1 Bf6 22. b3 Qe7 23. Rf2 Bd7 24. Ref1 Rae8 25. Kh1 Bc8 26. c5 bxc5 27. Bxc5 Ba6 28. Re1 f4 29. Bf1 fxg3 30. hxg3 Bh4 31. Bxd6 cxd6 32. Nc4 Bxc4 33. Bxc4 Bxg3 34. Rxf8+ Rxf8 35. Re2 Qh4+ 36. Rh2 Bxh2 37. Qxh2 Qe1+ 0-1

[Event "Munich Schach-Olympia (No FIDE event)"]
[Site "Munich"]
[Date "1936.08.23"]
[Round "11"]
[White "Koomen, Willem"]
[Black "Max, H."]
[Result "0-1"]
[ECO "D55"]
[PlyCount "52"]
[EventDate "1936.08.17"]
[EventType "team-tourn"]
[EventRounds "21"]
[EventCountry "GER"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]
[WhiteTeam "Netherlands"]
[BlackTeam "Bulgaria"]
[WhiteTeamCountry "NED"]
[BlackTeamCountry "BUL"]

1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bg5 Nbd7 6. e3 0-0 7. Rc1 b6 8. cxd5 exd5 9. Bd3 Bb7 10. 0-0 c5 11. Bb1 Re8 12. Ne5 Rc8 13. Bf5 Bc6 14. Bxf6 Bxf6 15. Nxc6 Rxc6 16. Nxd5 Nf8 17. Nxf6+ Rxf6 18. Bg4 Rd6 19. Qa4 Re4 20. Bf3 Rh4 21. g3 Rdh6 22. Bg2 Rxh2 23. dxc5 Qg5 24. c6 Qh5 25. Qe4 Rh1+ 26. Bxh1 Qh2# 0-1

[Event "Munich Schach-Olympia (No FIDE event)"]
[Site "Munich"]
[Date "1936.08.22"]
[Round "8"]
[White "Bary"]
[Black "Koomen, Willem"]
[Result "0-1"]
[ECO "C53"]
[PlyCount "46"]
[EventDate "1936.08.17"]
[EventType "team-tourn"]
[EventRounds "21"]
[EventCountry "GER"]
[SourceTitle "EXT 2018"]
[Source "ChessBase"]
[SourceDate "2017.10.13"]
[SourceVersion "1"]
[SourceVersionDate "2017.10.13"]
[SourceQuality "1"]
[WhiteTeam "France"]
[BlackTeam "Netherlands"]
[WhiteTeamCountry "FRA"]
[BlackTeamCountry "NED"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Qe7 5. 0-0 d6 6. d4 Bb6 7. d5 Nb8 8. a4 a6 9. b4 f5 10. Nbd2 Nf6 11. Re1 0-0 12. exf5 Bxf5 13. Nxe5 Qd8 14. Nef3 Ng4 15. Re2 Nd7 16. h3 Nge5 17. Re1 Qf6 18. Be2 Rae8 19. Bb2 Qg6 20. Kf1 Bd3 21. c4 Nxf3 22. Nxf3 Rxf3 23. gxf3 Bf5 0-1

[Event "NED-ch09 Final"]
[Site "Rotterdam"]
[Date "1936.07.04"]
[Round "6"]
[White "Van Doesburgh, Gerrit RD"]
[Black "Koomen, Willem"]
[Result "1-0"]
[ECO "C50"]
[PlyCount "83"]
[EventDate "1936.06.29"]
[EventType "tourn"]
[EventRounds "9"]
[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. Bc4 Bc5 4. d3 d6 5. Nc3 Nf6 6. Bg5 Ne7 7. Qd2 c6 8. 0-0-0 Bb4 9. Bxf6 gxf6 10. Qh6 Ng6 11. Qg7 Qe7 12. Nh4 Rf8 13. Qxh7 Nf4 14. g3 Nh3 15. Nf5 Bxf5 16. Qxf5 Ng5 17. Ne2 Ne6 18. c3 Ba5 19. d4 Nc7 20. f4 d5 21. dxe5 Qe6 22. Bd3 fxe5 23. fxe5 0-0-0 24. Nf4 Qxf5 25. exf5 Rde8 26. Rde1 d4 27. b4 Bb6 28. c4 c5 29. a3 cxb4 30. axb4 a5 31. bxa5 Bxa5 32. Re2 Na6 33. e6 Nc5 34. Kc2 fxe6 35. fxe6 Bc7 36. e7 Rf7 37. Nd5 Rf3 38. Rd1 Bd6 39. Bg6 Ra3 40. Bxe8 Ra2+ 41. Kb1 Rxe2 42. Bh5 1-0

[Event "Amsterdam 8-players"]
[Site "Amsterdam"]
[Date "1936.04.08"]
[Round "6"]
[White "Koomen, Willem"]
[Black "Struylaart, C."]
[Result "1/2-1/2"]
[ECO "E49"]
[PlyCount "43"]
[EventDate "1936.03.28"]
[EventType "tourn"]
[EventCountry "NED"]
[SourceTitle "EXT 2020"]
[Source "ChessBase"]
[SourceDate "2019.10.17"]
[SourceVersion "1"]
[SourceVersionDate "2019.10.17"]
[SourceQuality "1"]

1. d4 e6 2. c4 Nf6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 0-0 6. f3 d5 7. e3 Nbd7 8. Bd3 c6 9. Ne2 e5 10. cxd5 cxd5 11. e4 Re8 12. Ng3 exd4 13. cxd4 dxe4 14. fxe4 Nxe4 15. Bxe4 Nf6 16. 0-0 Nxe4 17. Qf3 Nxg3 18. Qxf7+ Kh8 19. hxg3 Qxd4+ 20. Kh2 Be6 21. Qf2 Qxf2 22. Rxf2 1/2-1/2

