I thought it would be interesting to have the ChessBase version of Rybka3 comment on the games of the current World Chess Championship; this might be especially so for the portion of our readership who might not be terribly familiar with the way in which computer chess engines comment on games.
The engine used was the “Dynamic” version of Rybka3. I ran the analysis at 45 seconds a move with a threshold of “30”, meaning that Rybka wouldn’t offer a variation unless the best line it found resulted in an improvement of 3/10ths of a pawn or more. The opening book used was Fritz Powerbook 2010 (which is the origin of the “Last book move” comment in each game).
It’s interesting to note that Rybka automatically generated two tactical training questions in analyzing the first game of the match, both based on mistakes Anand made. These points are shown in the notation with triple asterisks (“***”). In one of these cases I manually added some additional analysis by Fritz12, which is marked as such in the gamescore.
What I find most interesting about Game One was how quickly things “went south” for Anand. Although Rybka considers the position after 20…Kg8 as equal, Anand blows it by move 23 (and Rybka finds an alternative which would have provided Black with an advantage, though I’m not convinced that Topalov, much less any human player, would play 27.Qe6 to offer a Queen exchange at the cost of doubled pawns).
Topalov,V (2805) – Anand,V (2787) [D86]
WCh Sofia BUL (1), 24.04.2010
[Rybka 3 Dynamic 1-cpu]
1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 c5 8.Ne2 Nc6 9.Be3 0-0 10.0-0 Na5 11.Bd3 b6 12.Qd2 e5 13.Bh6
cxd4 14.Bxg7 Kxg7 15.cxd4 exd4 16.Rac1 last book move 16…Qd6 17.f4 f6 18.f5 Qe5 19.Nf4 g5 20.Nh5+ =/+
[-0.31 Rybka 3 Dynamic 1-cpu: 20.Nd5 Rf7 21.h4 h6 22.Qd1 Bb7 23.Re1 Kg8 24.Qh5 Raf8 25.Qxh6 Rh7 26.Qg6+ Rg7 27.Qh6 Rh7
28.Qg6+ Rg7 29.Qh6 Rh7 30.Qg6+ Rg7 31.Qh6 Rh7 32.Qg6+ Rg7 33.Qh6 Rh7 34.Qg6+ Rg7 35.Qh6= 0.00/14 ]
[0.00 Rybka 3 Dynamic 1-cpu: 20…Kh8 21.h4 Rg8 22.Rc2 Bb7 23.Rfc1 Rae8 24.Rc7 Re7 25.Rxe7 =/+ -0.31/15 ]
21.h4 h6 22.hxg5 hxg5 23.Rf3
[Fritz 12: 23…Bb7 24.a4 Rfc8 25.Re1 Rc5 26.Qa2+ Kf8 27.Qe6 Qxe6 28.fxe6 Ke7 29.Nxf6 Kxe6 30.Nd5 Re8 31.Rf5 -0.80/17 ]
*** 24.Nxf6 Kxf6 25.Rh3 Rg8+-
[3.60 Rybka 3 Dynamic 1-cpu: 25…Qf4 26.e5+ Kxe5+- 2.39/12 ]
26.Rh6+ Kf7 27.Rh7+ Ke8?+-
[5.48 Rybka 3 Dynamic 1-cpu: 27…Rg7 28.Rxg7+ Kxg7 29.Qxg5+ Kf8 30.Qd8+ Qe8 31.Qxd4 Bd7 32.Rc7 Nc6 33.Qf6+ Qf7 34.Qh6+ Qg7
35.Qxg7+ Kxg7 36.Rxd7+ Kf8 37.Bb5 Rc8 38.Bxc6 Rxc6 39.Rxa7 Rc4 40.e5 Rf4 41.Ra8+ Ke7 42.f6+ Kf7+- 3.41/14 ]
28.Rcc7 Kd8 29.Bb5 Qxe4? *** 30.Rxc8+?+-
[4.54 Rybka 3 Dynamic 1-cpu: 30.Rce7 Be6 #16/11 ] 1-0
Of minor interest is the fact that Fritz12 found a mate-in-13 (rather than #16), but that just goes to show that Black was totally sunk regardless.
Anand turned the tables nicely in Game Two. This one’s interesting because of the contrast with Game One. All seems well until Black’s 25th move, but even that wasn’t a catastrophe. Black’s game doesn’t totally collapse at that point; Black’s demise is more of a slow erosion rather than the sudden ugly avalanche of Game One.
Anand,V (2787) – Topalov,V (2805) [E04]
WCh Sofia BUL (2), 25.04.2010
[Rybka 3 Dynamic 1-cpu]
1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.g3 dxc4 5.Bg2 a6 6.Ne5 c5 7.Na3 cxd4 8.Naxc4 Bc5 9.0-0 0-0 10.Bd2 Nd5 11.Rc1 Nd7 12.Nd3 Ba7 13.Ba5
Qe7 14.Qb3 Rb8 last book move 15.Qa3=
[-0.20 Rybka 3 Dynamic 1-cpu: 15.Nb4 N7f6 16.Ne5 Qd6 17.Nxd5 Nxd5 18.Nc4 Qe7= 0.18/14 ]
15…Qxa3 16.bxa3 =/+
[-0.37 Rybka 3 Dynamic 1-cpu: 16.Nxa3 N7f6 17.Nc4 Bd7 18.Nd6 b6 19.Bb4 Rfd8 20.h3 Ba4 21.b3 Bb5= -0.03/15 ]
16…N7f6 17.Nce5 Re8 18.Rc2 b6 19.Bd2 Bb7 20.Rfc1 Rbd8 21.f4 Bb8 22.a4 a5 23.Nc6 Bxc6 24.Rxc6 h5 25.R1c4
[0.45 Rybka 3 Dynamic 1-cpu: 25…Ng4 26.Bf3 e5 27.fxe5 Nxe5 28.Nxe5 Bxe5 29.Bxh5 d3 30.exd3 Ne7 31.Rxb6 Bd4+ 32.Rxd4 Rxd4
33.Rb2 Rxa4 34.Bf3 =/+ -0.26/14 ]
26.Bxe3 dxe3 27.Bf3 g6 28.Rxb6 Ba7 +/=
[0.68 Rybka 3 Dynamic 1-cpu: 28…Re7 29.Kg2 Kg7 30.Rb3 Bc7 31.Rc5 Rd4 32.Rb7 Ne8 33.Ra7 Kf8 34.Rc2 h4 +/= 0.31/16 ]
29.Rb3 Rd4 30.Rc7 Bb8 31.Rc5 Bd6 32.Rxa5 Rc8 33.Kg2 Rc2+-
[1.75 Rybka 3 Dynamic 1-cpu: 33…Ng4 34.Ra6 Nf2 35.Nxf2 exf2 36.Kxf2 Bf8 37.a3 Rd2 38.Rc6 Rxc6 39.Bxc6 Ra2 40.Kf3 Bxa3 41.e3
Kg7± 0.92/15 ]
[2.72 Rybka 3 Dynamic 1-cpu: 34…Kg7 35.Ra7 Ng4 36.a5 Ra4 37.a6 Bxa3 38.Rbb7 Nh6 39.Ra8 Bd6 40.a7 Rc7 41.Rxc7 Bxc7 42.Nc5
Ra2+- 1.58/12 ]
35.Nb4 Bxb4 36.axb4 Nd5+-
[3.16 Rybka 3 Dynamic 1-cpu: 36…Kf8 37.Ra8+ Ke7 38.a5 Rd8 39.Rxd8 Kxd8 40.Rxe3 Nd5 41.Bxd5 exd5 42.Kf3 Ra4 43.Rb3 Kc7
44.Ke3+- 2.49/13 ]
[3.85 Rybka 3 Dynamic 1-cpu: 37…Nb6 38.Ra6 Nd7+- 2.87/13 ]
38.Rxa4 Rxa4 39.Bxd5 exd5 40.b6 Ra8 41.b7 Rb8 42.Kf3 d4?+-
[5.39 Rybka 3 Dynamic 1-cpu: 42…Kf8 43.Kxe3 Ke7 44.Kd4 Kd6 45.e3 f5 46.Rb6+ Kc7 47.Rxg6 Kxb7 48.Rf6 h4 49.Rxf5 Kc6 50.Rxd5
Rb2 51.Rh5 hxg3 52.hxg3 Rb4+ 53.Kc3 Ra4 54.g4 Kd6 55.g5 Ke6 56.Rh6+ Kd5 57.Rb6 Kc5+- 3.85/19 ]
ChessCentral offers a full line of chess playing/chess analytical software, including the Rybka3 and Fritz12 programs used in this post. Of additional interest are Volume One and Volume Two of Viswanathan Anand’s video chess biography.
Have fun! — Steve
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