Arizona played a good match this week against the sluggers. Naka never really got one of his types of positions (messy), Slava was under pressure in an anti grunfeld that shows how a few of us old timers are getting rusty and Josh while missing his changes to win after white played Kg2 (allowing e3 winning) was probably only deserving of a draw.
Here are some annotations to my game with Robby which has some theoretical value to the overall evaluation of a topical line in the Benko.
Milat,Marcel - Adamson,Robby [A58]
US Chess League, 26.10.2009
1.d4 Nf6 2.c4 No Trop this week. Time for something a little sharper 2...c5 3.d5 b5 Robby has an impressive repetoire in the benko. A quick search of games for Robby shows he might be one of the leading theorticians in the Benko. In preparing for the game, you quickly find he plays the benko against d4 and only a few other sidelines. Problem is he plays the benko well. He has had many good positions againt GMs and draws with Elvest and Dlugy etc. 4.cxb5 a6 5.bxa6 g6 6.Nc3 Bxa6 7.g3 d6 8.Bg2 Bg7 9.Nf3 Nbd7 10.Rb1 10 Rb1 has been considered one of the critical lines of the benko since 2001/2002 and has support from the super GM level including Kramnik. [10.0–0 Nb6 Here is a game with Robby in his element against a higher rated opponent. 11.Ne1 Nfd7 12.Nc2 Ne5 13.Ne3 Nbc4 14.Nxc4 Nxc4 15.Qa4+ Qd7 16.Qc2 Qb7 17.a3 0–0 18.b3 Rfb8!! Diagram
19.Rb1 (19.bxc4 Qb3 20.Qxb3 Rxb3³) 19...Na5 20.b4 cxb4 21.axb4 Qc7 22.bxa5 Rxb1 23.Qxb1 Qxc3 24.Qe4 Bf6 25.g4 Qc4 26.g5 Qxe4 27.Bxe4 Bc3 28.Bf3 Bc4 29.Bf4 Rxa5 30.Rc1 Ra1 31.Rxa1 ½–½ Kiriakov,P (2565)-Adamson,R (2344)/Minneapolis 2005/CBM 107] 10...Nb6 Diagram
10...Nb6 seems to be currently thought of as the most reliable defence for black. Black had first experimented with Qa5 ideas or 0–0 and Qa5 ideas before returning to Nb6. The idea is to quickly pressure d5 and if white play e4 to support d5 to try to return the bishop to the a6-f1 diagonal where the king might be trapped in the center and where the d3 square will be weakened. 11.b3 Mutipurpose move. In some lines black can play Bc4 and xd5 and b3 helps to let white play Bb2 or suport a4. 11...Bc8! [11...Bb7 12.Nh4 0–0 13.0–0] 12.Nh4! [Bc8 sets up the trap that the natural 0–0 allows Bf5 hitting Rb1 and white can not play e4 and next will be Ne4 for black with a slight edge. 12.0–0? Bf5 13.Rb2 Ne4³; 12.e4 White has tremendous compensation 12...Ba6 ] 12...h6 Both sides are battling for f5 13.Qc2 [13.0–0? g5 14.Nf3 Bf5³] 13...Qd7!? 14.Bb2!? The main branch in modern theory appears here. Some folks propose Bd2 here. This lends support to the c3 night and protects the b4 square which in some lines can have a Nb4 occur for black if he were to win the d pawn. In some cases the bishop also support a b4 pawn break. Of course the negative is that it really does not blunt the Bg7 and is rather passive. [14.Bd2 g5 15.Nf3 Nfxd5 16.Nxd5 Nxd5 17.Nxg5 Bb7 (17...hxg5 18.Bxd5 Bb7 19.Bxb7 Qxb7 20.f3 g4 21.Bc3 Bxc3+ 22.Qxc3 Rh7 23.Rb2 (23.0–0) 23...gxf3 24.exf3 Qb4 25.Qxb4 cxb4 26.h4 f5 27.Kf2) 18.Nf3 Ra3 19.0–0 0–0© 20.e4 Nb4 21.Bxb4 cxb4 22.Qd2 Bxe4] 14...g5 15.Nf3 Bb7!? [this might be a alternative for black. It pretty well forces e4 for white and leads to messy positions. White still might have a pull but they are quite weird positions. 15...Qf5!? 16.e4™ (16.Qd1?! Bb7 17.0–0 Nbxd5 18.Nxd5 Qxd5³) 16...Qg6 17.0–0 0–0 (17...Nfd7 18.Rfe1 Ne5 19.Nxe5 Bxe5 20.Na4 Nd7 21.b4 (21.f4 gxf4 22.gxf4 Bxb2 23.Qxb2 Rg8) 21...Bxb2 22.Rxb2 c4 23.Qxc4 0–0) 18.Rfd1 (18.Qd2 Qh5 (18...Ng4 19.Rfe1 Nd7²) 19.e5 Ng4 20.exd6 exd6 21.Rfe1 Nd7 22.Na4 Bxb2 23.Qxb2± f6 (23...c4 24.h3 Nge5 25.Nxe5 Nxe5 26.Nb6 Rb8 27.g4 Qh4 28.Rxe5 dxe5 29.bxc4 f5 30.c5 fxg4 31.hxg4 Qxg4 32.Re1 Ba6) 24.Qc2) 18...Bg4 19.h3 Bxf3 20.Bxf3± h5 21.a4 g4 22.hxg4 hxg4 23.Bg2 Nfd7 24.Ne2 Bxb2 25.Qxb2 Ne5 26.Nf4 Qg7] 16.Rd1 [16.e4 Ba6 17.h4 g4 18.Nd2 0–0] 16...0–0 [16...c4 17.0–0 0–0 18.e4 cxb3 19.axb3± Ng4 20.Nd4 Ba6 21.Rfe1 (21.Bh3 Bxf1) 21...Ne5 22.Nf5 Rfc8 23.f4 Qa7 24.fxe5 Nxd5+ 25.Kh1 Nxc3 26.Bxc3 Bxe5] 17.0–0 Ra7N [17...Nfxd5 Nd5 might be blacks best but white generally has a slight pull still even in some of the ending that could arise 18.Nxd5 Nxd5 a) 18...Bxd5 19.Bxg7 Kxg7 20.Nxg5 hxg5 21.Bxd5 Nxd5 22.Rxd5 f6 (22...f5 23.Qd2 Kg6 24.e4 Qe6 (24...f4 25.e5 Qh3 26.exd6 e6 27.Rxc5 Rxa2 28.Qd3+ Kh6) 25.exf5+ Rxf5 26.Rxf5 Qxf5 27.Re1 Ra7 28.a4 g4 29.a5 Kf7 30.Qe2 e5 31.a6 Qc8 32.Ra1 Ke7 33.Qb5) 23.f4 Qe6 (23...gxf4 24.Rxf4 Rh8 25.a4 Qh3 26.Rf2 Rab8 27.Qe4 Qd7 28.Qe3 Rb4 29.Rf4 Rhb8 30.Rxb4 Rxb4 31.Rh5 Qb7 32.a5 Rxb3 33.Qh6+ Kf7 34.Qh7+ Ke8 35.Qf5 Kd8 36.Rh8+ Kc7 37.Qe6 Rb1+ 38.Kf2 Rb4 39.Qxe7+ Kc6 40.Qe8+ Qd7 41.Qxd7+ Kxd7 42.a6 Ra4 43.a7) 24.e4 gxf4 25.Rxf4 Rh8; b) 18...Bxd5; 19.Bxg7 (19.Nxg5 hxg5 20.Bxg7 Nb4 (20...Kxg7 21.Bxd5 Bxd5) 21.Qc3 Rfb8 a) 21...Bxg2 22.Bxf8 Rxf8 23.Kxg2; b) 21...Nxa2 22.Qb2 Rfb8 23.Bh6 (23.Bxb7 Rxb7 24.Bh8 f6 25.Bxf6 exf6) 23...f6 24.Qc2 Qe8 25.Bxb7 Rxb7 26.f4 Qh5 b1) 26...g4 27.Qf5 (27.Qe4 Rb4 28.Qf5 Kh8 (28...Nc3 29.Qxg4+ Kf7 30.Rd3 Qg8 31.Qf3 Kg6 32.Rxc3 Kxh6) 29.Rxd6 Qf7 30.Rd7 Qh7 31.Qd5 Rbb8 32.Qh5 Rd8 (32...Nc3 33.Bg7+ Kg8 34.Qxh7+ Kxh7 35.Bxf6 Nxe2+ 36.Kg2 Rxb3 37.Rxe7+ Kg6) 33.Bg7+ Kg8) 27...Kh8 (27...Qf7 28.Rd5) 28.Qxg4 Qg8 29.Qh5 Qh7 (29...Qe8 30.Qf3 Rab8 31.Rd5 (31.Ra1 Kh7) 31...Rxb3 32.Qg4 Qg8) 30.Ra1 Rxb3 31.f5 Rb4 32.Rxa2 Rxa2 33.Qe8+ Qg8 34.Qxe7 Rg4 35.Qxf6+ Kh7 36.Bf4; b2) 26...gxf4 27.Rxf4 Rb4 28.e4 Qg6 29.Rh4 Kf7 30.Be3 Ra3 31.Qd2 Rxe4 32.Qd5+ Re6 33.Bd2 f5 34.Re1; 27.fxg5 Nb4 28.Qe4; 22.Bxb7 Rxb7 (22...Qxb7 23.Bh6 a) 23.a3; b) 23.Bh8 f6 (23...Kf8 24.Qg7+ Ke8 25.Qxg5 f6 26.Qh5+ Kd7 27.Bxf6 exf6 28.Qxc5 d5) 24.Bxf6 exf6 25.Rxd6 (25.Qxf6 d5 26.Qxg5+ (26.e4 Qg7 27.Qe6+) 26...Qg7 27.Qc1) ; 23...f6 24.h4 gxh4 a) 24...Kh7 25.hxg5 Qe4 26.Qc1 (26.a4 Nc6 27.Qd2 Nd4 28.gxf6 Qxe2 29.Qf4 e5 30.Qc1) 26...Nxa2 27.Qd2 fxg5 (27...Rxb3 28.gxf6 Nc3 29.fxe7 Nxe2+ 30.Kh2 Nd4 31.Qf4 Qxe7 32.Rfe1 Qb7 33.Rxd4 Rf3 34.Re7+ Qxe7 35.Qxf3 cxd4 36.Qxa8 Kxh6 37.Qh8+ Kg6 38.Qxd4; 27...Kg6 28.gxf6 exf6 29.Bf4 Rxb3 30.Rfe1; 27...d5) 28.Qxg5 Rg8 29.Qh5 Qg4 (29...Qg6 30.Qh4 Qxh6 31.Qxe7+ Qg7 32.Qxd6 Rge8 33.Qxc5 Nc3 34.Qf5+ Kg8 35.Rd7 Re7 36.Rxe7 Qxe7 37.Qg6+ Kf8 38.Kg2 Qe4+) 30.Qf7+ Kxh6 31.Qxe7 Rg7 32.Rxd6+ Kh7 33.Qe3 Qf5 (33...Rf8 34.Ra1 Nb4 35.Rh6+ Kg8 36.Qxc5 Qf5) ; b) 24...Qe4 25.hxg5 Kh7 26.f3; 25.Qc4+ Kh7 a) 25...e6 26.Qxe6+; b) 25...d5 26.Qxh4 Rxa2 (26...Qd7 27.e4 d4 28.Qh5 Qe8 29.Qg4+ Kf7 30.e5 Qh8 31.e6+ Ke8 32.Qh5+ Kd8 33.Qxc5 Qxh6 34.Rxd4+ Ke8 35.Rh4 Qg7 36.Qf5) 27.Qh5 e5 28.Qg6+ Kh8; 26.Qxh4 Rh8 27.e4 Kg6 (27...Rxa2 28.Kg2 Nc2 29.Rh1 Kg8 30.Qg4+ Kf7 31.Qg7+) ) 23.Bh6 f6 24.f4 g4 a) 24...Rxa2 25.fxg5 Kh7 (25...Qg4 26.gxf6 e5 27.Rxd6 Qxe2 28.f7+ Rxf7 29.Rd8+ Kh7 30.Rxf7+ Kg6 31.Rg7+ Kxh6 32.Qc1+ Kxg7 33.Qg5+) 26.gxf6; b) 24...Nxa2 25.Qc4+ e6 26.fxg5 f5 27.e4 Rb4 28.Qxc5 dxc5 29.Rxd7 Rxe4 30.Ra1 Rd4 31.Rg7+ Kh8 32.Rf7 Kg8 33.g6 e5 34.Rf1 f4 35.Rg7+ Kh8 36.Re7 Kg8 37.gxf4 Nc3 38.Rg7+ Kh8 39.fxe5 Rg4+ 40.Kh1 Ne4 41.Rh7+ Kg8 42.Ra7 Rd8 43.Rg7+ Kh8 44.Rd7 Ra8 45.Rf8+ Rxf8 46.g7+ Kh7 (46...Rxg7 47.Bxg7+ Kg8 48.Bxf8 Kxf8) 47.gxf8Q+; 25.f5 a) 25.a3 Rxa3 26.f5 Qb5 27.Qe3 Qe8 28.Qe4; b) 25.a3 Kh7 26.axb4 Rxb4 (26...Kxh6 27.bxc5 Qc6 28.b4 Rc8 29.Qe3 (29.Rc1 Qe4 30.f5 Rxb4 (30...Qxb4 31.Qe3+ Kh7 32.Rb1 Qxb1 33.Rxb1 Rxb1+ 34.Kf2 Rb7 35.cxd6 exd6 36.Qd4 Rf8 37.Qxg4 Rd7 38.h4 d5 39.e3 Re7 40.Qd1 Re5 41.Qh5+ Kg8 42.Qg6+ Kh8 43.g4 Re4 44.Kf3 Re5 45.g5 fxg5 46.f6 Re7 47.hxg5 Rc7 48.Qf5 Kg8 49.g6 d4 50.Qd5+ Kh8 51.Qe5 Kg8 52.Kg4 (52.f7+) 52...Ra7 53.Qd5+ Kh8 54.Qxd4) ) 29...dxc5 30.f5+ Kh7 31.Rf4 cxb4 32.Qb3 Qc5+ (32...e5 33.fxe6 Re7 34.Rxf6 Qc5+ 35.Kf1 Kg7 36.Rf4 Rf8 37.Rd7 Rxf4+ 38.gxf4 Kf6 39.Rxe7 Kxe7 40.e3) 33.Rdd4) 27.Bg5 fxg5 28.Qc2+ Kg7 (28...Kh8 29.Qg6 Rd4 30.Rxd4 cxd4 31.fxg5) ; 25...Qb5 26.Qe3 Kh7 27.a4 Qe8 28.Rf4 Qg8 29.Re4) 19...Kxg7 20.Nxg5 Nf6 (20...hxg5 21.Bxd5 Rh8 (21...Bxd5 22.Rxd5 f6) 22.e4 f6 23.f3 Ra7 24.Rf2 Rha8 25.a4 Rb8 26.f4 Bxd5 27.exd5 Qg4 28.Re1 Rb4 29.fxg5 Qxg5 30.Rfe2 Kf8 31.Qh7 Rbb7 32.Qd3 Rb4 33.a5 Rd4 34.Qh7 Rg4 35.a6 Qg6 36.Qh8+ Qg8 37.Qh3 Ke8 38.Re6 Kd8 39.Qf1 Rg5 40.Qb5 Kc8 41.Rxd6 Rxg3+ 42.Kh1 Rc7 43.a7 Rxa7 44.Rc6+ 1–0 Gustafsson,J (2513)-Kasparov,S (2458)/Deizisau 2002/CBM 087 ext) 21.Bxb7 (21.Nf3 Be4 22.Qb2 Qa7 23.Rd2 Qa3 24.Qa1 Qb4 25.Rfd1 Ra6 26.Nh4 Rfa8 27.Bxe4 Qxe4 28.f3 Qe3+ 29.Kh1 e6 30.Ng2 Qe5) 21...Qxb7 22.Nf3 Qe4 23.Qb2 Ra7 (23...d5 24.Rc1 Rfc8 25.Rfd1 d4 26.b4 Rab8 27.Rc4 Rxb4 28.Rxb4 cxb4 29.Rxd4 Rc2 30.Rxe4 Rxb2 31.Rxe7 Nd5) 24.Rd3 Rfa8 25.a4 Rb7 26.Re3 Qg4 27.Rd1 Rxa4 (27...Qh3 28.Qc2 a) 28.Nh4 Rxa4 29.Rf3; b) 28.Qa1 Kg8 29.Qc1 Ng4 (29...Rab8 30.Qc2 Ng4 31.Rc3 Rb4 32.a5 R4b7 33.a6 Ra7 34.Ra1 Rb6 35.Qd3 Kg7 36.Rc4 Nf6 37.Nh4 Rbxa6 38.Rxa6 Rxa6 39.Ra4 Rxa4 40.bxa4) 30.Re4 Rab8 (30...Rxb3 31.Qf4 Rb4 32.Rxb4 cxb4 33.Qxb4) ; 28...Kg8) 28.Rxe7] 18.e4™ Rc8 19.Rfe1! This has the threat of e5 with the idea that Nd5 will open up the game favorably for white. 19...Ng4 [19...c4 20.Nd4± (20.e5 Nfxd5 21.e6 fxe6 22.Qg6 Qe8= 23.Qxe6+; 20.h4!?) 20...cxb3 21.axb3 Ra2 22.Nxa2 Rxc2 23.Nxc2 Qc7 24.Ne3 Nbd7 25.Nb4 Qb6 26.Nc6 e5 27.Nc4 Qc7 28.Ne7+ Kh8 29.Nf5 Bf8 30.Rc1 Qb8 31.Ba3 Ne8 32.Bh3 Ba6 33.Nxh6 Bxh6 34.Bxd7 Bxc4 35.bxc4 Qa7 36.Bxe8 Qxa3 37.Bxf7 g4 38.Ra1 Qb4 39.Bh5 Qxc4 40.Bxg4 Bd2 41.Reb1 Qc7 42.Ra6 Ba5 43.Rb5 Be1 44.h4 Qc2 45.Rb8+ Kg7 46.Rb7+ Kg6] 20.h4 This is one of the negatives of blacks position. Normally if white plays h4 black would play g4. Now g5 and the black kingside becomes soft 20...Ne5 [‹20...gxh4 21.Nxh4 Bd4 22.Bh3 Diagram
I was hoping this position would arrise. Black can with the exchange but at the cost of allowing nf5 and no protection around the king. 22...Bxf2+ 23.Kg2 Bxe1 24.Rxe1+- And like most computers... they slowly start to like white position 24...Rca8 25.Nf5] 21.Nxe5 Bxe5 22.hxg5 hxg5 23.Qe2! g4 black can not allow qh5 24.Qe3! again tickeling black with the idea of Qh6. The nice thing about this square is that c4 play will not work with Nb6 and Bc3 is not going to work either. Actually during the game, I was not sure of what plan black could attempt given it would be his turn. 24...Kh7™ 25.f4?? I sometimes wonder if drug testing in chess has any merits at all. I know its politics for attempting to get chess into the Olympic circle. Here I would have liked to have seen the IOC check my blood content level for perscription drugs (Arizona voodoo??). Of course f4 was based on a few major hallucinations starting with the thought that Seattle had not won a single US Chess League game of the week in 2009 and I might be able to do that with gf3 Kf2!! (with the idea of Rh1 later). [25.Bf1! leads to an overwhelming position. Ironically this was my first candidate move. Sigh.. I think I need to play more chess.... Ra5 26.Kg2 Kg6 27.Be2 f6 28.Rh1 Rg8 29.Qh6+ Kf7 30.Qh5+ Rg6 31.Rh4 Bc8 32.Bc1 Bxc3] 25...gxf3 26.Qxf3 [26.Kf2?? This is the move I almost played. 26...fxg2 (26...Bxg3+ 27.Kxf3+-) 27.Qg5 When white has a good game except for Qh3!! winning for black.] 26...Rg8 27.Qh5+ [¹27.Qxf7+ Rg7 28.Qh5+ Kg8] 27...Kg7 28.Bh3 Qe8 Here Robby offered a draw and i only saw the perp. ½–½ 29.Na4 [¹29.Nb5 Qxb5 30.Bxe5+ dxe5 31.Qxe5+ Kf8 32.Qb8+ Bc8 33.Bxc8 The computer prefer white here, but to be truthful I did not even see Qb8 when thinking about Nb5.] 29...Bxb2 30.Nxb2 Rxa2 31.Qg5+ Kf8 32.Qh6+=