[Event "Candidates Tournament"] [Site "?"] [Round "0"] [White "Keres"] [Black "Smyslov"] [Result "0-1"] [ECO "A17"] [Opening "English: Anglo-Indian, 2.Nc3 e6 3.Nf3"] 1. c4 Nf6 2. Nc3 e6 3. Nf3 c5 4. e3 Be7 5. b3 {White chooses to play unambitiously in the opening and Black is not challenged at all.} 5... O-O 6. Bb2 b6 7. d4 cxd4 8. exd4 d5 9. Bd3 Nc6 10. O-O Bb7 11. Rc1 {11.Qe2 allows Black to take advantage of White's weakened d-pawn after 11...Nb4 12.Bb1 dxc4 13.bxc4 Bxf3 14.Qxf3 Qxd4} 11... Rc8 12. Re1 Nb4 13. Bf1 Ne4 14. a3 Nxc3 15. Rxc3 {White hopes to lift the rook over to the kingside for a mating attack. 15.Bxc3 Na2 16.Rc2 Nxc3 17.Rxc3 dxc4 18.bxc4 would give the advantage to Black because of his two bishops and White's weakened pawn structure.} 15... Nc6 16. Ne5 Nxe5 17. Rxe5 Bf6 18. Rh5 { The White rooks are preparing for a kingside attack.} 18... g6 {18...a6 would allow White a tremendous attack after 19.Rxh7 Kxh7 20.Qh5+ Kg8 21.Rh3 Bh4 22. Rxh4 f5 23.Qh7+} 19. Rch3 {Although this attack on the h-file looks impressive Black breaks through the center with a winning counter attack. Conventional wisdom holds that a flank attack is best met by reacting in the center of the board.} 19... dxc4 {19...gxh5 and the Black king falls to a mating attack after 20.Qxh5 Re8 21.a4 The point is that White's dark-square bishop will go to a3, taking away the f8 square from Black's king.} 20. Rxh7 {20.Qg4 c3 21. Bxc3 Rxc3 22.Rxc3 Qxd4 23.Qxd4 Bxd4 24.Rc7 gxh5 25.Rxb7 A draw is likely since the bishops are of opposite color.} 20... c3 21. Qc1 { 21.Bxc3 allows Black a winning decoy sacrifice.} 21... Qxd4 {Black takes a pawn while strengthening his defense on the a1-h8 diagonal. 21...cxb2 allows White a mating attack.} 22. Qh6 {Although, White's tripling looks impressive on the h-file, Black has all the squares defended and in ready for the counter attack.} 22... Rfd8 23. Bc1 Bg7 24. Qg5 Qf6 { Because of his strong passed c-pawn Black would like to exchange queens.} 25. Qg4 c2 {Now the c-pawn is only one square from promoting.} 26. Be2 Rd4 { Black provokes White to play pawn f4 in order for his counter attack to open the g1-a7 diagonal for his queen.} 27. f4 Rd1+ 28. Bxd1 Qd4+ { White resigned as Black's c-pawn promotes to a queen after 29...cxd1=(Q).} 0-1