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Greg Gomez / Deep Fritz vs J L Jerz / Rybka
CG.com Masters vs. Machines Invitational (2007), Yahoo Chess, rd 1, Feb-10
Sicilian Defense: Lasker-Pelikan. Sveshnikov Variation (B33)  ·  0-1
ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-20-07  chessmoron: PART I:

1. e4 <tournament created by Wilson Hu/chessmoron; Time control: 2 hours and a half> c5 2.Nf3 <Notes by Greg Gomez/Artar1> Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5 11.Bd3 Be6 12.O-O Bxd5 13.exd5 Ne7 14.c3 <The main line of the Sveshnikov between 1992 - 2002 according to Grandmaster D. Rogozenko. White will try to fight against Black's pawn center by attempting to provoke the advance of the e4-pawn. Key players in White's attack will be the white-squared bishop and the f- and g-pawns. At the right moment, Black will counter on the queenside with the advance of the b-pawn, and will use the c-file, e-file, and the a7-g1 diagonal for his counterattack. > Bg7 15.Qh5 e4 16.Bc2 O-O 17.Rae1 <This move has caused Black players the most problems, according to D. Rogozenko.> Qc8 18.Bb3 <Another major alternative is 18.Kh1, as follows: 18.Kh1 (First played by Tseshkovsky, 1992 after direct attempts to create an attack with 18.f3 and 18. g4 failed to achieve desired results because of Black's queenside counterplay and kingside defense.) 18...Ng6 (Prepares Black for White's 19.f3 or 19. g4.) 19. Bb1 Re8 20.Nc2 f4 Most likely choice according to Fritz, but better for Black is (20...Nf4 21.Qg5 Nxd5 22.Nd4 Re5! 23.f4 White can also try 23.Qh4 followed by 24.f3 according to D. Rogozenko.) 23...h6! (A. Nikitin) 24.Qxg7+ Kxg7 25.fxe5 dxe5 26.Nxf5+ Kf8 27.Nxh6 Ra7 Unclear and complicated.) 21.Nb4 Re5 22.Qd1 Qc4 23.b3 Qxc3 24.Nc6 Ree8 25.Bxe4 White has a small but stable advantage, Ramesh-Al Sayed, 2002.> a5 19.Nxb5 <Even though 19.Nxb5 is a major book line and has been played frequently in the past, it is not White's best response in this line, according to D. Rogozenko. At best it leads to equality for Black, but White needs to be careful. Better is 19.Qg5, as was played in the Shirov-Kramnik, 2003 game, which White went on to win. However, Black had resources that would have held the balance. > a4 20.Bd1 Qc5 21.Nd4 Qxd5 22.Re3 h6 <!? A Rybka novelty? 22...Rfb8 23.Rh3 h6 24.b3 a3!? (24...f4 =) 25.Bc2 Rc8 26.Rd1 Qe5 (Vallejo Pons-van Wely, 2002, with a double-edged position.) 27.f4 Qa5 28.b4 Qb6 29.Bb3 d5 30.Kf1 Bxd4 31.Rxd4 Rxc3 32.Rxc3 Qxd4 33.Rg3+ Ng6 34.Rxg6+ fxg6 (Deep Fritz, 22-ply; The other alternatives favored Black.) >

Apr-20-07  chessmoron: PART II:

23.b3 <Alternatives don't help White: 23.f3 Bxd4 24.cxd4 Qxd4 25.Qxh6 ; 23. Rg3 Kh8 24.Rh3 (24.a3 f4 25.Qxd5 Nxd5 26.Rh3 Bxd4 27.cxd4 Kg7 ) 24...Qxa2 25.Qg5 (25.Nxf5? 25...Nxf5 26.Qxf5 Qxb2 ) 25...f6 26.Rxh6+ Bxh6 27.Qxh6+ Kg8 28.Bh5 Qxb2 29.Ne6 Rf7 30.Bxf7+ Kxf7 31.Nf4 Qb3 32.Nh5 Ke6 33.Qxf6+ Kd7 34.c4 e3 35.c5 dxc5 36.fxe3 a3 37.Qe5 Ra6 38.Ng7 a2 39.Nxf5 Nxf5 40.Qxf5+ Qe6 41.Qd3+ Kc7 42.Qc3 a1Q 43.Rxa1 Rxa1+ 44.Qxa1 Qxe3+ 45.Kf1 Qd3+ 46.Kg1 Qe3+ Draw> a3 <Fritz evaluations have turned negative. Black now has a small advantage. Improvements in the 18.Bb3-line are needed. > 24.Rfe1 <The alternatives are not better. White's position is cramped and slowly worsens from here. [24.Rh3 f4 25.Qxd5 Nxd5 26.Nf5 Rfe8 27.Bg4 Re5 > Bxd4 <After 20–ply, Fritz failed to see the bishop-knight exchange before 20.Rfe1 was played, and considered 24...Rac8 to have been stronger. > 25.cxd4 Kh7 26.Qh4 <For Fritz, the choice was between the text move, 26.Qh4, and 24...Rh3. After 21–ply, both were given a negative score of –0.11. John L. Jerz/RandomVisitor, in his analysis, suggests that Fritz should have played 26. Rh3. [26.Rh3 Qe6 27.Qg5 d5 ] The alternatives are not attractive. Black's kingside defense continues to hold while his queenside play and central pawn push become increasingly more difficult to keep in check. Black has the better chances. > Qe6 27.Rh3 <But 27.f3 d5 28.Bc2 Rac8 29.Qf2 is not much better. > d5 28.f3 Rg8 <28...Rac8 may be more precise, for it takes advantage of the open c-file, but 28...Rg8 has its advantages by putting direct pressure on White's castled position. > 29.Qf2 Rg6 <Instead of using the c-file to continue the attack, Rybka threatens to use the g-file by doubling the rooks there while adding more protection to the h6-pawn. > 30.Be2 <?! After 19-ply, the text move was played. In the postmortem, Fritz now favors 30.Rh4, while John L. Jerz/RandomVisitor recommends 30.fxe4, a move not even considered by Fritz in its list of five candidate moves. 30.Rh4 Rc8 31.Kh1 Rc3 ; 30.fxe4 fxe4 31.Rc3 Rag8 . Black's doubled rooks and central pawn mass will prove to be too much for White.>

Apr-20-07  chessmoron: PART III:

30...e3 31.Qh4 Rc8 <Black secures the all-important c-file. > 32.Bd3 Rc3 <The game is all but lost for White. > 33.Bb1 Kg7 34.Qf4 Qf6 <Black is now clearly better. > 35.Rh4 Qg5 <As in the style of Capablanca, Rybka goes for simplification before making the final push. > 36.Qxg5 hxg5 <This move had to be forced. Rybka had used too little time on its clock to achieve a winning position! > 37.Rh3 <Marginally better is 37.Rh5, but Black will still double the rooks on the c-file. > f4 38.Kf1 Rgc6 39.Rd1 Rc2 <White is helpless. > 40.Bxc2 Rxc2 <A crushing win for RV and Rybka. Perhaps White can avoid this debacle by playing 23.Rg3 for the draw. > 0-1

Apr-25-07
Premium Chessgames Member
  fm avari viraf: Congrats to <Wlison Hu/chessmoron> for creating such an interesting tournament & also to <Greg Gomez/Artar1> for the lovely notes.
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