[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.02.21"]
[Round "5"]
[White "Heijboer, Herman"]
[Black "Heun, Jetze"]
[Result "1-0"]
[ECO "A03"]
[WhiteElo "1795"]
[BlackElo "1475"]
[PlyCount "93"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. f4 d5 2. Nf3 g6 3. e3 Bg7 4. d4 Nf6 5. Bd3 Nc6 6. c3 Ne4 7. Nbd2 f5 8. 0-0 0-0 9. a3 e6 10. c4 Kh8 11. cxd5 exd5 12. Bxe4 fxe4 13. Ne1 Rb8 14. Nc2 b6 15. Qe2 Qh4 16. b4 Ne7 17. b5 Qg4 18. Qxg4 Bxg4 19. Re1 Bc8 20. a4 a5 21. Ba3 Re8 22. Bxe7 Rxe7 23. Rac1 Be6 24. Na3 Rc8 25. Rc3 Bf8 26. Rec1 Ree8 27. Nc2 Bd6 28. h3 Kg7 29. g4 h6 30. Kg2 Rf8 31. Nf1 Bd7 32. Ng3 Rf7 33. Na1 Bb4 34. R3c2 Ba3 35. Rf1 Bd6 36. Rb1 Be6 37. Nb3 Bb4 38. Nc1 Bd6 39. Nce2 Rd8 40. Rf1 Rc8 41. f5 Bd7 42. Nf4 gxf5 43. Ngh5+ Kh7 44. Nxd5 Be6 45. Nhf4 Bxd5 46. Nxd5 Kg6 47. Nxb6 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2020.01.24"]
[Round "4"]
[White "Heun, Jetze"]
[Black "Riegman, Timothy"]
[Result "1/2-1/2"]
[ECO "B35"]
[WhiteElo "1475"]
[PlyCount "63"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 d6 5. Nc3 Nf6 6. Bc4 g6 7. Be3 Bg7 8. Nxc6 bxc6 9. Rb1 0-0 10. 0-0 e6 11. Bg5 h6 12. Bf4 d5 13. exd5 exd5 14. Bd3 Nh5 15. Ne2 Nxf4 16. Nxf4 c5 17. c4 dxc4 18. Bxc4 Qxd1 19. Rfxd1 Bf5 20. Nd3 Rac8 21. b3 Bd4 22. Rbc1 Rfe8 23. Rd2 Re4 24. Re1 Rxe1+ 25. Nxe1 Re8 26. Re2 Rxe2 27. Bxe2 Bb1 28. a4 Ba2 29. Bc4 Kf8 30. Nd3 f6 31. Kf1 Ke7 32. Ke2 1/2-1/2

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.12.20"]
[Round "3"]
[White "Peper, Jeroen"]
[Black "Heun, Jetze"]
[Result "1-0"]
[ECO "D36"]
[BlackElo "1475"]
[PlyCount "66"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. d4 d5 2. c4 e6 3. cxd5 exd5 4. Nc3 Nf6 5. Bg5 Nbd7 6. e3 Be7 7. Bd3 0-0 8. Nf3 c6 9. Qc2 h6 10. Bh4 Ne8 11. Bg3 Ndf6 12. h3 c5 13. 0-0 cxd4 14. Nxd4 Nd6 15. Rac1 Bd7 16. Nf5 Nxf5 17. Bxf5 Bc6 18. Rfd1 Bd6 19. Bxd6 Qxd6 20. Ne2 Qe5 21. Nd4 Bd7 22. Bxd7 Nxd7 23. Qc7 Rfd8 24. Qxb7 Rab8 25. Qxa7 Ra8 26. Qb7 Rab8 27. Qc7 Qf6 28. b3 Ne5 29. Nc6 Nxc6 30. Qxc6 Qf5 31. Rc5 Rbc8 32. Qb5 Rb8 33. Qd3 Qxd3 1-0

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.29"]
[Round "2"]
[White "Heun, Jetze"]
[Black "De Zoeten, Cato"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "1475"]
[BlackElo "1870"]
[PlyCount "64"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 Qc7 7. Bd3 e5 8. Nb3 Be6 9. 0-0 Be7 10. Kh1 Nbd7 11. f4 exf4 12. Bxf4 Ne5 13. Nd4 Bd7 14. Nd5 Nxd5 15. exd5 Nxd3 16. Qxd3 0-0 17. Qg3 Rfe8 18. Bh6 Bf8 19. Nf5 Bxf5 20. Rxf5 Re5 21. Rxe5 dxe5 22. Bg5 Re8 23. Rc1 b5 24. b3 Ba3 25. Bf6 g6 26. Re1 Qxc2 27. Bxe5 Bb4 28. Bc3 Rxe1+ 29. Bxe1 Qc1 30. Qb8+ Kg7 31. Qe5+ Kh6 32. d6 Qxe1+ 0-1

[Event "Leiden SB-ch 1920"]
[Site "Leiden"]
[Date "2019.11.08"]
[Round "1"]
[White "Tleis, Mohamed"]
[Black "Heun, Jetze"]
[Result "0-1"]
[ECO "A22"]
[BlackElo "1475"]
[PlyCount "72"]
[EventDate "2019.11.08"]
[EventType "swiss"]
[EventRounds "7"]
[EventCountry "NED"]
[SourceTitle "EXT 2023"]
[Source "ChessBase"]
[SourceDate "2022.10.05"]
[SourceVersion "1"]
[SourceVersionDate "2022.10.05"]
[SourceQuality "1"]

1. c4 e5 2. Nc3 Nf6 3. e3 g6 4. Nf3 Bg7 5. Nxe5 0-0 6. d4 d6 7. Nd3 Nc6 8. Nf4 Re8 9. Bd3 Nxd4 10. h4 Bf5 11. Nce2 Bxd3 12. Nxd4 Bxc4 13. Nf3 Ne4 14. Qc2 Bb5 15. Bd2 Bc6 16. 0-0-0 Nxf2 17. h5 Be4 18. Qb3 g5 19. Bc3 Bxc3 20. Qxc3 Nxd1 21. Kxd1 h6 22. Ng6 fxg6 23. hxg6 Qe7 24. Rxh6 Bxf3+ 25. gxf3 Qg7 26. Qc4+ d5 27. Qxd5+ Kf8 28. Qf5+ Kg8 29. Rh7 Rad8+ 30. Kc2 Rd2+ 31. Kxd2 Qxb2+ 32. Qc2 Rd8+ 33. Ke1 Qxc2 34. Rh8+ Kxh8 35. g7+ Kg8 36. Kf1 Rd1# 0-1

