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Sunday, January 25, 2009

Analysis of Stellwagen-Adams:round 8;Corus 2009

Here is some analysis I have done of the game between GM Stellwagen and GM Adams from the Corus Chess Tournament round 8 using Deep Rybka 3:

Here is some analysis of this game:

Stellwagen,D (2612) - Adams,Mi (2712) [C92]
Corus A Wijk aan Zee NED (8), 25.01.2009
[Deep Rybka 3]

Opening:Ruy Lopez:Flohr-Zaitsev variation 1.e4 e5 2.Nf3 Nc6 3.Bb5 The Ruy Lopez. 3...a6 Paul Morphy's idea,forcing Stellwagen to make a decision about the future of his bishop in the game. 4.Ba4 Nf6 5.0-0 Be7 6.Re1 b5 7.Bb3 d6 8.c3 0-0 9.h3 Preventing ....Bg4. 9...Bb7 This move is the defining one of the variation, indirectly pressuring the White e-pawn. It is called the Flohr-Zaitsev variation and has been used a great deal by Former WC champion Karpov (especially against Kasparov in their wc matches).Zaitsev was a long-time trainer of Karpov).With 9...Bb7 Black prepares to put more pressure on e4 after 10.d4 Re8 11.Nbd2 Bf8 when play can become very sharp and tactical. 10.d4 The main line, opening up the c1-h6 diagonal so he can complete the development of his minor pieces. 10...Re8 Clearing the f8-square for his bishop, so he can give more protection to his e-pawn. 11.Nbd2 Developing another minor piece. 11...Bf8 12.a4 The most often played move, allowing him to retreat his bishop to a2 or c2 if Adams plays ...Na5. 12...Na5 A rarely played idea. 13.Ba2 [Analysis:Usually White plays 13.Bc2 ] 13...c5 Further pressuring the white d-pawn. 14.d5 Closing the center, which reduces the mobility of the black fianchettoed bishop. 14...c4 Adams reduces the mobility of Stellwagen's light-squared bishop, however white can play b3 in the future. 15.b4 Attacking the knight, which forces Adams to capture the White b-pawn enpassant. 15...cxb3 16.Nxb3 Nc4 Aggressively posting his knight, where it interferes with the ability of Stellwagen to coordinatge his minor pieces. [Analysis:It is more popular to play 16...Bc8 in this position.] 17.Nfd2 Attacking the black knight and permitting Stellwagen to play f3 in the future to protect his e-pawn with another pawn, rather than having to rely on minor pieces to protect the pawn. 17...Nb6N Creating a double-attack against the white a-pawn. [Analysis:Prior to this game the only move which had been played in this position was 17...Rc8 [Event "RUS-chT 13th"] [Site "Sochi"] [Date "2006.04.20"] [Round "1"] [White "Volokitin, Andrei"] [Black "Kasimdzhanov, Rustam"] [Result "1/2-1/2"] [ECO "C92"] [WhiteElo "2660"] [BlackElo "2673"] [PlyCount "56"] [EventDate "2006.04.20"] [EventType "team-tourn"] [EventRounds "11"] [EventCountry "RUS"] [Source "ChessBase"] [SourceDate "2006.05.09"] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Bb7 10. d4 Re8 11. Nbd2 Bf8 12. a4 Na5 13. Ba2 c5 14. d5 c4 15. b4 cxb3 16. Nxb3 Nc4 17. Nfd2 Rc8 18. Qf3 Nxd2 19. Nxd2 Nd7 20. axb5 axb5 21. Ba3 Ra8 22. Bb4 Qc7 23. Bb3 Nc5 24. Bc2 Reb8 25. Qe2 Na4 26. Ra3 Bc8 27. Bd3 Bd7 28. Qe3 Nc5 1/2-1/2 ; Deep Rybka preferred: 17...Qc7 ; 17...Qc8] 18.a5 Attacking the knight, threatening to win a tempo.As well this move closes the queenside and blocks in the black fianchettoed bishop from both sides. [Analysis:Deep Rybka :(a) 18.Na5 Qc7 19.Nxb7 Qxb7 20.Bb3 Rec8 21.Qf3 Nxa4 22.Bxa4 bxa4 23.Rxa4 Qd7 24.Ra3 a5=; (b) 18.axb5 axb5 19.Bb1 Rxa1 20.Nxa1 Na4 21.Re3 Qb6 ] 18...Na4 Attacking the white c-pawn winning a tempo. 19.c4 The lost tempo. 19...b4 Blocking in White's light-squared bishop. 20.Bb1 Attacking the black knight threatening to win at least a tempo. 20...Nc3 Attacking Stellwagen's queen winning a tempo. 21.Qf3 Bc8 Spending a tempo to take the bishop off the blocked diagonal to increase its mobility. 22.Bd3 Preventing his bishop from being exchanged off. [Analysis:Deep Rybka 3 preferred 22.Bb2 with a possible continuation being 23. 22...Nxb1 23.Rexb1 g6 24.Qe3 Nd7 25.Ra4 Rb8 26.Bc1 Nf6=] 22...Bd7 Activating another minor piece. 23.Nb1 Threatening to remove the black knight from c3. 23...Na4 Keeping his piece on the board. 24.Be3 Redeveloping another minor piece, preventing Adams from returning his knight to c5. [Analysis:Deep Rybka: 24.Re2 h6 25.Rea2 Nc5 26.Nxc5 dxc5 27.Be3 Be7=] 24...Qc7 Overprotecting his d-pawn and forcing Stellwagen to defend his attacked c-pawn with his bishop. [Analysis:Deep Rybka preferred: (a) 24...Qe7 25.N1d2 Rec8 26.Rec1 Nc3 27.Nb1 Na4 28.N1d2 h6=; or (b) 24...Rb8 25.Re2 Qc7 26.Rea2 Nc5 27.Nxc5 dxc5 28.Nd2 Bc8=] 25.N1d2 [Analysis:Deep Rybka 3: 25.Re2 Be7 26.Rea2 Nc5 27.Nxc5 dxc5 28.Nd2 h6 29.Nb3 Rab8 30.Rd2 Rbd8 31.Bc2 Rc8=] 25...Reb8 Protecting his weak b-pawn, which dissuades Stellwagen from trying to attack the pawn in the immediate future. 26.g4 Nc3 Creating a double-attack against Stellwagen's e-pawn which ties down two of Stellwagen's pieces to defend this pawn. 27.Nb1 Threatening to play 28.Nxc3. 27...Na4 28.N1d2 Nc3 29.Nb1 The players agreed to a draw. 1/2-1/2

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