[Event "World Championship"] [Site "?"] [Round "7"] [White "Zukertort"] [Black "Steinitz"] [Result "0-1"] [ECO "D35"] [Opening "QGD: 3.Nc3 Nf6 4.e3"] 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. e3 c5 5. Nf3 Nc6 6. a3 {A good waiting move. The idea is to move White's light squared bishop to c4 in one move instead of two in the event Black plays 6...dxc4. White also threatens to capture at c5 and then play b4 and Bb2. 6.Bd3 dxc4 7.Bxc4 when White's bishop has moved two times to get to c4.} 6... dxc4 7. Bxc4 cxd4 8. exd4 { White has open lines as compensation for his isolated d-pawn.} 8... Be7 9. O-O O-O 10. Be3 {This is not the best move since the bishop on e3 acts as a big pawn while it blocks the e-file for White's major pieces. 10.Re1 would give White's pieces more activity.} 10... Bd7 {10...b6 With the idea of 11...Bb7 would keep the d-file open thus putting greater pressure on the isolated d-pawn.} 11. Qd3 { 11.d5 would lead to massive exchanges after 11...exd5 12.Nxd5 Nxd5 13.Bxd5} 11... Rc8 12. Rac1 Qa5 13. Ba2 Rfd8 14. Rfe1 Be8 { Black clears the d-file so his rook can pressure the isolated d-pawn.} 15. Bb1 {White forms a battery on the b1-h7 diagonal.} 15... g6 {This move not only stops any attack White might get against the h7 square, but it also allows Black' dark squared bishop to attack the d-pawn from the g7 square.} 16. Qe2 Bf8 17. Red1 Bg7 18. Ba2 Ne7 19. Qd2 Qa6 {19...Bc6 20.Nd5 Qxd2 21.Nxe7+ Kf8 22. Nxg6+ hxg6 23.Nxd2 would leave White a pawn ahead.} 20. Bg5 Nf5 { Black has a big advantage due to his pressure on White's isolated d-pawn.} 21. g4 {This weakening of White's kingside is a mistake even if the knight had to go backwards. 21.Be3 With the idea of activating the king knight with 22.Ne5 would be a better idea.} 21... Nxd4 22. Nxd4 e5 23. Nd5 Rxc1 24. Qxc1 { 24.Rxc1 exd4 25.Nxf6+ Bxf6 26.Bxf6 Qxf6 would give Black a winning advantage due to his extra pawn and White's exposed king.} 24... exd4 25. Rxd4 Nxd5 26. Rxd5 {Not 26.Bxd8 Bxd4 27.Bxd5 Qe2 when Black has an attack on three White pawns b, f and g.} 26... Rxd5 27. Bxd5 {White's bishops are clearly more active, but there is a significant weakness on the kingside.} 27... Qe2 28. h3 {The h-pawn no longer enjoys the protection of the king.} 28... h6 { Black cannot capture this pawn.} 29. Bc4 {29.Bxh6 Bxh6 30.Qxh6 Qd1+ 31.Kh2 Qxd5 } 29... Qf3 30. Qe3 Qd1+ 31. Kh2 Bc6 {31...hxg5 32.Qxe8+ Kh7 33.Bxf7} 32. Be7 Be5+ 33. f4 {Now White's king is even more exposed, and all of a sudden the Black bishops are more active than the White ones. Now Black has a winning sacrifice. Try to find it yourself.} 33... Bxf4+ 34. Qxf4 Qh1+ 35. Kg3 Qg1+ { White resigned, since the only legal move allows a crushing fork:} 36. Kh4 Qe1+ 37. Qg3 Qxe7+ 38. g5 Qe4+ 39. Qg4 Qe1+ 40. Qg3 hxg5+ 41. Kg4 Qe4+ 42. Kxg5 Qxc4 43. Qb8+ Kh7 0-1