[Event "Amsterdam"] [Site "?"] [Round "0"] [White "Reshevsky"] [Black "Euwe"] [Result "1/2-1/2"] [ECO "E38"] [Opening "Nimzo-Indian: Classical, 4...c5"] {A follow up to the previous game} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O 6. Nf3 Na6 7. Bd2 Nxc5 8. a3 Bxc3 9. Bxc3 b6 10. Ng5 Re8 $1 { The only defence against the threat of} (10... -- 11. Bxf6 Qxf6 12. Qxh7#) ( 10... g6 11. b4 Na6 12. h4 h6 13. h5 $40 {winning attack}) 11. b4 h6 $1 { Black must conduct his defence as vigorously as possible} (11... Na6 { White strengthens his position undisturbed}) 12. h4 {We saw this type of Knight sacrifice in Example 110. There is, however, the important difference that after the acceptance in teh present case the attacker will have immediate control of the h-file} 12... hxg5 {The logical continuation} (12... Na6 13. Rd1 Bb7 14. f3 {White controls the whole board}) 13. bxc5 (13. hxg5 Nfe4 14. bxc5 Bb7 (14... Nxc3 15. Qh7+ Kf8 16. Qh8+ Ke7 17. Qxg7 Ne4 18. g6 Rf8 19. Qe5 Bb7 { Black is holding his own}) 15. g3 Nxg5 16. O-O-O bxc5 17. e4 { White would have very good chances}) 13... gxh4 {In general it is not wise for the defender to open files for the enemy Rooks. However,} (13... g4 14. h5 e5 15. f3 {White would retain excellent chances}) 14. Rxh4 bxc5 15. Qd3 $1 d6 ( 15... d5 16. Qh3 Kf8 17. cxd5 exd5 18. Rh8+ Ke7 19. Bxf6+ gxf6 20. Qe3+ Be6 21. Qxc5+ {White has a favourable endgame}) 16. g4 $1 { White continues teh attack with this sharp riposte} (16. -- e5) 16... Bb7 $1 { We know from earlier examples that the defender must not hesitate to give back some of his gains, or even put himself on the debit side of the material balance sheet. Viewed in this light it is therefore of considerable importance for the defender to be a pawn inhand} (16... Kf8 17. g5 Ng8 18. Rh8 -- 19. Qh7) 17. g5 Ne4 18. Rxe4 Bxe4 19. Qxe4 Qxg5 {The air has cleared. Black has broken the direct attack, but this is not to say that all danger of defeat is over. The position is indeed such that White's two Bishops may well be worth more than Black's Rook and two pawns. An analysis of this endgame, however, would fall outside our scope} 20. Qg2 Qh6 21. Qh3 Qxh3 22. Bxh3 Rab8 23. Bg2 Kf8 24. Kd2 Ke7 25. f4 f6 26. Kc2 Rh8 27. Bf3 Rh4 28. Rg1 Kf7 29. f5 $2 Rxc4 30. fxe6+ Kxe6 31. e4 g5 32. Rh1 Rxc3+ $1 33. Kxc3 Ke5 34. Rf1 Rf8 35. Bg2 f5 36. exf5 Rxf5 37. Re1+ Kf6 38. Kc4 Rf4+ 39. Kc3 1/2-1/2