[Event "15"] [Site "Moskva Alekhine-mem (02.11.5"] [Round "0"] [White "Keres"] [Black "Botvinnik"] [Result "1-0"] [ECO "B33"] [Opening "Sicilian: Open, 2...Nc6"] {White avoids piece exchanges} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 h6 8. Bxf6 gxf6 9. O-O-O a6 10. f4 h5 11. Kb1 Bd7 12. Be2 Qb6 {White holds an advantage in space; Black has the Bishop pair. The doubled pawn in the Black set-up could become a liability, but it might also turn out to be an advantage. In an ending the doubling, although devaluing the pawns themselves, could enhance the activity of the Bishop pair} 13. Nb3 $1 { By this avoidance of the exchange, White poses Black the perpetual question of how to get some play for his pieces - a problem which is particularlytroublesom e here in view of Black's serious lack of space.} (13. Rhf1 Nxd4 14. Qxd4 Qxd4 15. Rxd4 {White retains the initiative at the cost of pieces}) 13... O-O-O 14. Rhf1 Na5 {Going for simplications.} 15. Rf3 $1 { From here the Rook can operate on either flank} 15... Nxb3 16. axb3 Kb8 17. Na4 $1 {Now it is clear that White has a firm hold on the initiative. He has no cause to fear exchange of this Knigt, for this would mena Black giving up his trump card, the Bishop pair.} 17... Qa7 (17... Bxa4 18. bxa4 {the b3 squa re would be available for the Rook, enabling it to join in a powerful attack on the Black king}) 18. f5 $1 {The direct attack begins} 18... Be7 19. fxe6 fxe6 20. Rxf6 $1 {A splending combination which nets White a pawn} 20... Rh7 (20... b5 21. Rf7 Be8 22. Rg7 bxa4 23. Qb4+ Ka8 24. e5 Bc6 25. exd6 $18 { pinning tactics}) (20... Bxf6 21. Qxd6+ Kc8 22. Nb6+ $18) 21. Rg6 b5 22. Nc3 Qc5 23. Na2 Ka7 24. Nb4 Rf8 25. Bf3 h4 26. h3 Bc8 27. Nd3 Qc7 (27... Qd4 28. c3 Qb6 29. e5 d5 30. Bxd5 {pinning tactics}) 28. Nf4 Rf6 29. Bg4 Rxg6 (29... Rhf7 30. Nxe6 $1 Bxe6 31. Bxe6 Rxg6 32. Bxf7 {removing the guard}) 30. Nxg6 Bb7 31. Bxe6 Bd8 32. Bd5 Bxd5 33. Qxd5 Rf7 34. e5 {pinning tactics} 1-0