[Event "?"] [Site "?"] [Round "0"] [White "Euwe"] [Black "Van den Bosch"] [Result "1-0"] [ECO "E20"] [Opening "Nimzo-Indian Defence"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 O-O 6. f3 d5 7. e3 c5 8. cxd5 exd5 9. Bd3 b6 10. Ne2 Ba6 11. O-O Bxd3 12. Qxd3 Nc6 13. e4 cxd4 14. cxd4 Qd7 15. Bg5 Ne8 16. Rac1 Nd6 17. exd5 Na5 18. Bd2 Ndb7 19. Nf4 h6 20. Rfe1 b5 { After a temporary pawn sacrifice at d5, Black has shifted the main part of his forces to the Queenside. This allows Whte the opportunity of getting in his blow on the oppositewing} 21. Nh5 Qxd5 (21... -- 22. Bxh6 gxh6 $2 23. Nf6+) 22. Re5 Qa2 23. Nxg7 $1 Nb3 (23... Kxg7 24. Bxh6+ Kxh6 25. Rh5+ (25. Qe3+ Kg7 26. Qg5+ Kh7 27. Qh4+ Kg7 28. Qg4+ Kh8 29. Rh5#) 25... Kxh5 26. Qh7+ Kg5 27. Qg7+ Kf5 28. g4+ Ke6 29. Qe5+ Kd7 30. Rc7+ Kd8 31. Qe7#) 24. Nh5 $1 Qxd2 (24... Nxc1 25. Nf6+ Kg7 26. Qh7+ Kxf6 27. Qxh6#) (24... f5 25. Rxf5 Nxc1 26. Rxf8+ Kxf8 27. Bb4+ Ke8 28. Qxb5+ Kd8 29. Qxb7) 25. Nf6+ Kg7 26. Qh7+ Kxf6 27. Rc6+ Nd6 28. Rxd6# 1-0