Showing posts with label Ribli. Show all posts
Showing posts with label Ribli. Show all posts

09 March 2012

King Safety

A nice win by Judit Polgar in last year's European Individual Championship highlights the importance of king safety. The game Pantsulaia -- Polgar,J, Aix-les-Bains 2011 was published as Chess Informant 111/3 and was voted the best game of that edition of Informant. It scored a remarkable three first place and three second place votes from the seven judges. The lone skeptic, Zoltán Ribli scored it in tenth place. The tournament bulletin also published an annotated version of the game.

Pantsulaia,L (2595) - Polgar,Ju (2686) [A13]
Aix-les-Bains 111/3, 2011

1.c4 e6 2.Nf3 Nf6 3.g3 d5 4.Qc2 c5 5.d4 cxd4 6.Nxd4 e5 7.Nb3 Nc6 8.Bg2 Nb4 9.Qd1 dxc4 10.N3d2 Bf5 11.Na3 b5 12.Bxa8 Qxa8 13.Nf3 

Black to move

13...Nd3+ 14.exd3 Bxd3

Polgar sacrificed a knight to trap the White king in the center. But she was already down an exchange, and so, as the tournament bulletin notes, "Judit is a rook down at this moment!"

15.Nxb5 Bb4+ 16.Nc3 0–0 17.Rg1 

In Polgar's Informant annotations, this move is given a box (only move). She offers a line where White castles, but with a king far less secure than in the game. Black gets a bishop on f3 and a queen on c8 with intent to move c8-h3-g2.

17...Ne4 18.Bd2 Rd8 19.Rc1 Nxc3 20.bxc3 Ba3

White to move
Still down a rook, here Polgar wins back the exchange.

21.Be3 Bxc1 22.Bxc1 Rb8 23.Nd2 Qd5 24.Qa4 a5 25.Qd1 h6 

White to move

Polgar gives White's next move a question mark, but it is no easy matter to suggest something useful here. The White rook is neither helping defend the vulnerable king, nor contributing anything to a counterattack. Although down material, Black is ahead where it matters: the field of battle.

26.Qf3 Rb1 27.Kd1 e4 28.Qf4 Ra1 29.Qb8+ Kh7 30.g4 Qd7 31.Qe5 e3 

See tomorrow's post for a comment of the importance of this move, or see the tournament bulletin.

White to move
32.fxe3 Qa4+ 33.Ke1 Rxc1+ 34.Kf2 Rxg1 0–1


Training

For many years, I have started my work where a Grandmaster game ends. Grandmaster resignations and Grandmaster annotations reveal their perceptions of a clear and decisive advantage in a position where I might yet falter. One such position in this game occurs in Polgar's annotations. Instead of 27.Kd1, as in the game, White might have returned the queen to d1.

Judit Polgar gives 27.Qd1 Ra1 28.a3 e4-+.

White to move
6k1/5pp1/7p/p2q4/2p1p3/P1Pb2P1/3N1P1P/r1BQK1R1 w - -

I played from this position with Black against Rybka 4. After more than an hour, and several take-backs, I saw the welcome words on the screen that the Silicon Monster gave up.

My best line, stripped of all the dead ends and detours:

Rybka 4 x64 - Stripes,James
Blitz 25m Spokane, 08.03.2012

29.Nf1 Ra2 30.Ne3 Qe5 31.Bd2 Qb5 32.Bc1 Qb1 33.a4 Ra1 34.Kd2 Ra2+ 35.Ke1 Be2 36.Qxe2 Qxc1+ 37.Qd1 Qb2 38.Qc2 Qa1+ 39.Qd1 Qxc3+ 40.Kf1 Ra1 41.Kg2 Rxd1 42.Rxd1 Qb3 43.h4 Qxa4 44.Rd4 Qb3 45.Nxc4 f5 46.Nd2 Qc3 47.Rd8+ Kh7 48.Nf1 a4 49.Ne3 a3 0–1

Perhaps you could do better.

27 March 2011

Playing by the Book

Among the attractive features in correspondence chess is the research element. In ancient times, serious correspondence players with the means and the space built up huge libraries of chess books and periodicals. When Chess Informant come into existence with its innovative opening classification system, this publication became the standard. Not everyone had equal access to information, naturally.

Kon Grivainis explained his strategy while playing in the World Correspondence Chess Federation's championship without the access to the latest theory that was available to his opponents:
Due to my travels I had discarded all my opening books. I did not have any. ... I had to find obscure variations! Remember Fischer--he used to do that to get away from the Russian research.
Grivainis, Winning Correspondence Chess (1997), 70.
He adopted the Trompowski Attack as part of his strategy to avoid the deep study of trendy opening manuals.

My first taste of correspondence play began with friends in the 1970s, and I entered one USCF tournament. My "extensive" chess library consisted of some one dozen books, including I.A. Horowitz, Chess Openings: Theory and Practice (1970). As college brought new activities into my life, chess play all but ceased. I returned to active chess after finishing graduate school, and entered some correspondence events in the late-1990s. It was then that I bought my first issues of Chess Informant, and the first two volumes of the Encyclopedia of Chess Openings.

One game that I played in the late 1990s became memorable because my research took me to one specific game in Chess Informant 64. My game had the same position as the reference game for a single move, but studying Chess Informant suggested an idea that carried me through to victory. Of course, notes in the printed copy of this volume, and in the margins of my printed ECO confirm that I looked at a great many games with similar ECO codes. In addition to CI and ECO, I had a copy of Zoltan Ribli and Gabor Kallai, Winning with the English (1992). The Informant reference game was a win by Ribli in the 1995 Hungarian Championship.

Ribli,Z - Sherzer,A [A12]
Magyarorszag 64/7, 1995

1.Nf3 Nf6 2.g3 d5 3.Bg2 Bf5 4.d3 e6 5.0–0 Be7 6.c4 c6 7.b3 0–0 8.Bb2 Nbd7 9.Nbd2 a5 10.a3 h6 11.Qc2 Bh7 12.Bc3 b5 13.cxb5 cxb5 14.Qb2 Qb6 15.b4 axb4 16.axb4 Rfc8 17.Rxa8 Rxa8 18.Nb3 Bd6 19.Ra1 Re8 20.Bd4 Qb8 21.Bc5 e5 22.Ra6 Nxc5 23.bxc5 Bc7 24.d4 e4 25.Ne5 Bxe5 26.dxe5 Nd7 27.Qd4 Nxe5 28.Qxd5 Nc4 29.Bh3 e3 30.f3 Rd8 31.Bd7 Qc7 32.Ra8 Bc2 33.Bf5 1–0

My opponent was Faneuil Adams, Jr., one of America's premier chess patrons. The game was played the two years prior to his death. We began early in 1997, and he resigned in November 1998. During the game we carried on a bit of conversation concerning scholastic chess on our move cards--I was a single father of a young boy who began showing an interest in chess at age four, and Adams helped found New York's Chess-in-the-Schools program. I remember the conversation as much as the game. It was a privilege to play this distinguished opponent.


Stripes,James - Adams,Faneuil [A12]
97 CA 17 USCF Class, 1998

1.c4 c6 2.Nf3 d5 3.b3 Bf5 4.g3 Nf6 5.Bg2 e6 6.Bb2 Nbd7 7.0–0 h6 8.d3 Be7 9.Nbd2 0–0 10.Qc2 Bh7 11.a3 a5



Through an entirely different move order, we have reached the same position as Ribli-Sherzer 1995 that I found in Informant 64/7.

12.Bc3!

Copying Ribli. Studying Ribli's game suggested reasons for this move: supporting b3-b4, and vacating b2 for the queen. From b2, the queen asserts her influence along the long diagonal and supports action along the a- and b-files. The flexibility of these two-pronged assaults and their facilitation by the quiet Bc3 was outside the scope of how I had been thinking about chess strategy prior to this game.

12... Qb8

12...b5 was played by Sherzer

13.b4 axb4 14.axb4 Rxa1 15.Rxa1

15.Bxa1? Bxb4 16.Rb1 c5 gives Black an edge.

15...e5 16.e3 Re8



17.Qb2

White prepares the advance b5.

17...Bd6

Black plans e4.

18.c5 Bc7 19.d4 e4 20.Ne1



20... h5

One of the small errors: failing to interfere with White's plan. 20...b5 21.Qa3 would have left White with a very slight edge.

21.b5 g5

Rybka prefers 21...Bf5 22.Nc2.

22.Nc2± h4

Another slight error.

22...Bd8!?±

23.bxc6+- bxc6



24.Qxb8

I might have built up pressure more effectively with 24.Nb4 Qb7 25.Ra6 Kg7 26.Rxc6 Rd8+-.

24...Nxb8± 25.Ra7 Re7 26.Nb4 hxg3 27.hxg3



27...g4?

One of only two moves given a question mark by Rybka 4 full analysis. It's an ugly move that reduces the mobility of Black's light-squared bishop. Such dynamic positional concepts within the algorithms of chess software, it seems to me, contributes in large measure to the current strength of Rybka, Hiarcs, Fritz, and other leading engines.

27...Bf5!? and Black is still in the game

28.Na6+- Nxa6 29.Rxa6 Re6 30.Nb3 Nh5?

The other move that Rybka deemed an error. But, the superior 30...Ne8+- does not change the game's evaluation. It is clear that White's penetration on the queenside will roll up Black's defenses. What can Black do to generate some play? My opponent seized on the idea of sacking a piece for two pawns, perhaps creating a vulnerability for my king.

31.Ba5 Bxg3 32.fxg3 Nxg3 33.Bc7 Nf5 34.Be5 f6 35.Ra8+ Kg7 36.Ra7+ Kg6 37.Bf4 Bg8 38.Bf1 Bf7 39.Ba6 1–0