[Event "Soviet Championship"] [Site "?"] [Round "0"] [White "Keres"] [Black "Botvinnik"] [Result "0-1"] [ECO "E32"] [Opening "Nimzo-Indian: Classical Variation"] 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5 6. Bg5 h6 7. Bh4 c5 8. O-O-O {8.e3 cxd4 9.exd4 Nc6 10.Bb5 O-O 11.Nge2 Qb6 Black has the initiative.} 8... Bxc3 9. Qxc3 g5 10. Bg3 cxd4 11. Qxd4 {By opening up the c-file, Black creates opportunities for attack on the queenside.} 11... Nc6 12. Qa4 Bf5 13. e3 {White has still not developed any of the pieces on the kingside and therefore it will be hard for those pieces (or the bishop at g3) to come to the defense of the king.} 13... Rc8 14. Bd3 {14.Ne2 a6 15.Nc3 b5 16.Qxa6 b4 17. Bb5 Bd7 18.Nxd5 Nb8+ The discovered check wins the queen.} 14... Qd7 15. Kb1 Bxd3+ 16. Rxd3 Qf5 {This pin must be broken, but how?} 17. e4 {17.Qc2 Nb4} 17... Nxe4 {The threat is Nxg3, with a discovered attack on the rook at d3.} 18. Ka1 O-O 19. Rd1 b5 {This deflects the queen from the important d4-square.} 20. Qxb5 Nd4 { Because of the weakness of the back rank, this knight cannot be captured.} 21. Qd3 Nc2+ 22. Kb1 Nb4 {White resigned, because there is no defense.} 23. Qe2 Nd2+ 24. Ka1 Nc2# 0-1