[Event "Amsterdam"] [Site "?"] [Round "0"] [White "Euwe"] [Black "Winter"] [Result "1-0"] [ECO "B54"] [Opening "Sicilian: Open, 2...d6, 4...Nf6"] {The great significance of Pc4 for White} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. f3 Nc6 6. c4 $1 e6 7. Nc3 Be7 8. Nc2 O-O 9. Be2 Qc7 10. O-O Rd8 { In the Sicilian the question whether White can play Pc4 or not is vital. From the preceding examples we have seen that Black's chief trump card is his action down the half-open c-file, with the eventual central advance ... Pd5, also playing an important part If, however, White succeeds in playing Pc4, both these plans for Black are forestalled. He will not make much headway on the c-file against White's bulward at c4, while the advance ... Pd5 will be, to say the least, a difficultmatter} 11. Bf4 Ne5 (11... Qb6+ 12. Kh1 d5 13. cxd5 exd5 14. exd5 Be6 15. Bc4 Qc5 16. Ne3 Nh5 17. Bc7 Rd7 (17... Qxe3 18. Bxd8 Rxd8 19. Qe1 Qxe1 20. Raxe1 Na5 21. Bb5 a6 22. Ba4 b5 23. dxe6 bxa4 24. exf7+ Kxf7 25. Re5) 18. Qe1 Rxc7 19. dxe6 {White has won a pawn}) 12. Nb5 (12. b3 d5 13. exd5 exd5 14. Nxd5 Nxd5 15. cxd5 Qc5+ 16. Kh1 Rxd5 $15 {In general is true that whenever Black achieves ... Pd5 successfully he gets the advantage}) 12... Qb8 (12... Qc5+ 13. Be3 Qc6 14. Ncd4 Qd7 15. f4 Nc6 16. Nf3 d5 17. cxd5 exd5 18. e5 Ne4 19. Rc1 {Black has achieved ... Pd5 but it will do him no good. White's kingside pawn majority ensures him a strong attack}) 13. Qd2 a6 (13... d5 14. Qc3 Nfd7 15. cxd5) 14. Nc3 Qc7 15. b3 b6 16. Rac1 Bb7 17. Nd4 Rac8 18. Rfd1 Nc6 19. Nxc6 Bxc6 $2 { This allows White to transform his space advantage into something more concrete } (19... Qxc6 {White would have trained his guns on the b-pawn} 20. Be3 -- 21. Bf1 -- 22. Qf2 -- 23. Na4) 20. Nd5 $1 Qb7 (20... exd5 21. cxd5 Qb7 22. dxc6 Rxc6 23. Bxa6 $1 $16) (20... Bxd5 21. cxd5 Qb7 22. Rxc8 Rxc8 23. dxe6 fxe6 24. Qb4 {Decisive positional advantage}) 21. Nxe7+ Qxe7 22. Bxd6 Qb7 23. Qe3 Rd7 24. e5 Ne8 25. Rd4 Rcd8 26. Rcd1 Qa7 27. Rg4 f5 (27... Nxd6 28. exd6 Rxd6 29. Rxd6 Rxd6 30. Qe5) 28. Rgd4 b5 {This is often Black's best chance when Whte plays Pc4, but here it is far too late} 29. c5 Qb7 30. a4 Ra8 31. Bd3 Bd5 32. Bxf5 1-0