[Event "Mahrisch Ostrau"] [Site "?"] [Round "0"] [White "Reti"] [Black "Lasker"] [Result "0-1"] [ECO "A06"] [Opening "Reti: 1...d5"] 1. Nf3 d5 2. d4 Nf6 3. c4 c6 4. Nc3 dxc4 5. e3 b5 {The Slav defense, in which Black has won a pawn but this is only temporary. In return, White can take control of central squares and develop pieces.} 6. a4 { An important move, which undermines Black's pawn chain.} 6... b4 {6...a6 7.axb5 cxb5 8.Nxb5 allows White to regain his pawn with advantage because of his better pawn structure.} 7. Na2 e6 8. Bxc4 { White has regained the pawn, but the knight is now misplaced.} 8... Be7 9. O-O O-O 10. Qe2 Nbd7 11. b3 {11.e4 Fighting for the center would be more consistent with the ideas behind this opening.} 11... a5 { Black plays to lock the a2 knight out of the game.} 12. Bb2 c5 13. Rfd1 Qb6 14. Nc1 Ba6 15. dxc5 {15.Bxa6 Qxa6 16.Qxa6 Rxa6 Black stands better due to White's undeveloped queenside and b3 weakness.} 15... Nxc5 16. Ne5 Bxc4 17. Nxc4 Qa6 18. Bd4 Rfc8 19. Bxc5 {19.h3 would allow Black to win a pawn.} 19... Bxc5 20. Qf3 Be7 21. Nd3 {21.Ne2 would allow White to keep the d-file open for his rooks while covering the c3 square.} 21... Nd5 22. Nde5 Bf6 {22...f6 woul d allow a pretty smothered mate with 23.Rxd5 exd5 24.Qxd5+ Kh8 25.Nf7+ Kg8 26. Nh6+ Kh8 27.Qg8+ Rxg8 28.Nf7+} 23. e4 Nc3 24. Rd6 { 24.Rd7 Gaining the seventh rank would be only temporary after Ra7.} 24... Qb7 25. Re1 Bxe5 26. Nxe5 Qc7 27. Nc4 { 27.Rd7 Qxe5 28.Qxf7+ Kh8 Black is fine since his queen guarding the g7 square.} 27... e5 {Played to stop White from opening the f3-a8 diagonal for his queen by e5. 27...Nxa4 28.e5 Rd8 29.Red1 Nc3 30.Rd7 Rxd7 31.Qxa8+} 28. Qf5 Ne2+ 29. Kf1 {A mistake which will be seen shortly. White's king would be safer tucked away in the corner after 29.Kh1.} 29... Nd4 30. Qxe5 Nxb3 { Black has the advantage thanks to his passed b-pawn.} 31. Nb6 Nd2+ { This move would not be possible had White played 29.Kh1.} 32. Kg1 Nc4 33. Nxc4 Qxc4 34. Qf5 Rab8 {Black's lends support to promoting his passed b-pawn.} 35. e5 b3 36. e6 fxe6 37. Rdxe6 Rf8 38. Qe5 Qc2 39. f4 b2 40. Re7 Qg6 41. f5 Qf6 42. Qd5+ {42.Qxf6 would not help to halt the b-pawns advance after...Rxf6 43. Rb1 Rc6 44.Ree1 Rc4 45.Re2 Rc1+ 46.Rxc1 bxc1Q+} 42... Kh8 43. Rb7 Qc3 { White resigned. 43...Qc3 White resigned since he can't stop the b-pawn from promoting for example...} 44. Rf1 Qe3+ 45. Kh1 Qc1 0-1