[Event "The Hague"] [Site "?"] [Round "0"] [White "Euwe"] [Black "Mattison"] [Result "1-0"] [ECO "A09"] [Opening "Reti: 2.c4"] 1. Nf3 d5 2. c4 Nf6 3. cxd5 Nxd5 4. d4 e6 5. e4 Nb6 6. Nc3 Be7 7. Bd3 O-O 8. O-O c5 9. dxc5 Bxc5 10. e5 {An ideal attacking set-up for White. The classic bishop sacrfice and h7 is threatened} 10... Be7 (10... -- 11. Bxh7+ Kxh7 12. Ng5+ Kg8 13. Qh5 Qd3) 11. Qe2 Nc6 12. Rd1 Nd5 { Other moves also allow White to continue to strengthen his position} (12... Qc7 13. Bg5 {exchange of bishops would eliminate Black's only useful defensive piece, at the same time leaving his d6 square irreparably weak.}) (12... Bd7 13. Ne4 h6 14. Ng3) 13. Be4 $1 Nxc3 (13... Ncb4 14. a3 Nxc3 15. bxc3 Nd5 16. Qc2) 14. Bxh7+ Kh8 (14... Kxh7 15. Qc2+) 15. bxc3 Qa5 16. Bc2 Qxc3 17. Qe4 g6 18. Ng5 Qb4 (18... Bxg5 19. Bxg5 Qxe5 20. Qxe5+ Nxe5 21. Bf6+) 19. Nxf7+ Rxf7 20. Qxg6 Rg7 21. Qh5+ Kg8 22. Bh6 Bf8 (22... -- 23. Qe8+ Bf8 24. Bxg7 Kxg7 25. Qg6+ Kh8 26. Qh7#) 23. Rd3 1-0