GM Oscar De La Riva (2521) vs IM Mashafziul (2422)
39th Olympiad, Round 9, 30.9.2010
Analysed by Centaur (Hairulov + Rybka 4)
1. e4 c5 2. Nf3 Oscar divert from his usual choice 2.c3 2...d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 The English Attack. I think Mas will choose 6...e5 which is more positional and suit his style compare to 6...e6 which often lead to a wild game. 6...e5 as expected 7. Nf3 Be7 8. Bc4 O-O 9. O-O Qc7 10. Bb3 Be6
11. Qe2 Black doesn't mind a double pawn after 11.Bxe6 fxe6 12.Ng5 Qd7 and black will have strong center pawns. 11...Rc8 12.Bg5 Nbd7 13.Rfd1 b5 14.Ne1 Bc4 15.Bxc4 Qxc4 16. Qxc4 bxc4
Black open the b-file for his rook 17. Bxf6 Nxf6 18. Nd5 Nxd5 19. Rxd5 Rab8 20. b3 g6 21. g3 f5 22. exf5 gxf5 23. Ng2 cxb3 Mas position looks good. After 24.cxb3 black can start to maneuver his king for endgame with 24...Kf7 followed by Ke6 24.axb3 (24.cxb3 seems better) 24...Kf7?! 
Mas should have just take the c2 pawn with 24...Rxc2 for e.g 25.Ne3 Rc6 26.Nxf5 Kf7 and black is ok 25.Ne3 now white can win a pawn after 25...Ke6 26.Rda5 Ra8 27.Rxa6 Rxa6 28.Rxa6 25...Ke6 26.Rda5 Rc3 probably better is 26...Ra8 27.Rxa6 Rxa6 28.Rxa6 Rc3 with active play 27.Rxa6 Rd8 28. Rd1 h5 29. Kf1 h4 30. Ke2 White's improve his king. It did not look good for Mas. I think the best he get is a draw.30...Bg5 31. Rd3 Rxd3 32.Kxd3 e4+ 33. Ke2 f4 34. gxf4 Bxf4 35. h3 White put his pawn on the light square so that it would not be attack by black's bishop. At the same time , he fix black h-pawn. 35...Be5 36. Ra7 Rc8 37.Rh7
37...Bf4? Now black will lose more pawn. 37...Bf6 protecting the h-pawn must be play. 38. Rxh4 Bxe3 39. Kxe3 39.Rxe4+! is stronger but the text move is also winning. I think Mas could have already resign here. 39...Rxc2 40.Kxe4 1-0 Mas resign. After 40...Rxf2 41.b4 white is totally winning.
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