Author: Stuart Cracraft
Date: 21:20:23 09/04/04
Go up one level in this thread
On September 04, 2004 at 21:39:53, Cliff Sears wrote:
>[d] 4rrk1/1b2bppp/2q5/p1P1p3/3pN3/5P2/PPB1Q1PP/2RR2K1 b - - 0 20
>
>1934 game between Alexander McDonnel and Louis Labourdonnais. From "The World's
>Greatest Chess Games" by Burgess
>
>Black to move and the move made by Black was "f5" "Black immediately begins the
>decisive advance. Note that he spends no time on prophylaxis against White's
>Queenside play, confident that his pawn-storm will sweep everything from its
>path"
>
>Black went on to win.
>
>Fritz 8 Suggests: Bb7-a6
>Hiarcs 8 Suggests: Qc6-d7
>and Kibitzer Anaconda 1.6.2 Suggests: Re8-c8
>
>Does your engine have an even different suggestion or even the played move?
Looks like everybody is disagreeing. Here are the results of
GA and Crafty. And they both differ from each other as well
as with the above!
GA gives a lot of weight to centralized knights. In this case
enough to get the bishop over to hit the knight, but not enough
to force a f5 push. Wouldn't be hard to make the program do it.
Still, there are clues, the tempo of f5 hitting the knight -- relative
lack of white king defense, the weakness at f3 and the weak(er) g3, etc.
I believe the king side pawn storm is a bit of a stretch though popular
in that time as defensive play was not popular. Stronger players will
no doubt disagree.
Alpha=-108 Beta=392 Maxdepth=9999999 MaxTime=9999999
1/ 3> c6e4 0.00 392 8 c6e4
1/ 4 e7c5 0.01 1104 89 e7c5
2/18< e7c5 0.02 854 841 e7c5 e4c5 c6c5 c2h7
2/18 c6d5 0.02 142 1780 c6d5 e2b5
3/21 e8d8 0.06 145 10295 e8d8 e2c4 f8e8
4/21 e8d8 0.13 141 31863 e8d8 e2e1 c6c7 c2b3
5/27 c6e6 0.52 140 141955 c6e6 e2d3 e6h6 c2b3
6/31 c6d5 2.41 134 690624 c6d5 e2b5 e7d8 e4d6 b7c6 c2e4
7/36 b7c8 16.89 134 4221047 b7c8 e2e1 c8f5 e1a5 e8a8 a5b4 a8a2
8/48 e8b8 51.29 133 12385562 e8b8 e2d3 c6h6 d1e1 b7d5 d3a3
9/48 b7c8 259.08 127 49174372 b7c8 e2d2 c8f5 e4d6 f5c2 c1c2 e8a8 d6f5 e7f6
Crafty 19.16 plays:
7 0.98 -0.02 1. ... Rd8 2. Bd3 Qe6 3. Qd2 a4 4.
Ng5 Bxg5 5. Qxg5 Qxa2
7-> 1.87 -0.02 1. ... Rd8 2. Bd3 Qe6 3. Qd2 a4 4.
Ng5 Bxg5 5. Qxg5 Qxa2
8 3.10 0.15 1. ... Rd8 2. Bd3 Rc8 3. Re1 Rfd8 4.
Nd6 Bxd6 5. cxd6 Qxc1 6. Rxc1 Rxc1+
8 6.97 0.09 1. ... Rc8 2. f4 f6 3. Bd3 exf4 4.
Bc4+ Kh8 5. Rxd4 Bxc5 6. Nxc5 Qxc5
8 11.83 -0.08 1. ... Qc7 2. Re1 f5 3. Nd2 Bxc5 4.
Qc4+ Kh8 5. Bxf5 Rxf5 6. Qxc5
8-> 12.60 -0.08 1. ... Qc7 2. Re1 f5 3. Nd2 Bxc5 4.
Qc4+ Kh8 5. Bxf5 Rxf5 6. Qxc5
9 17.20 0.00 1. ... Qc7 2. Re1 Bc6 3. Bd3 f5 4.
Nd2 Bg5 <HT>
9 20.54 -0.01 1. ... Rd8 2. Bd3 Rd5 3. Bc4 Rdd8 4.
Bd3
9-> 24.38 -0.01 1. ... Rd8 2. Bd3 Rd5 3. Bc4 Rdd8 4.
Bd3
10 39.70 0.04 1. ... Rd8 2. Bd3 Qe6 3. b3 Qc6 4.
Nd2 Rd5 5. f4 Rfd8 6. fxe5 Bxc5
10 1:03 -0.03 1. ... Qc7 2. Re1 Bd5 3. f4 Rb8 4.
Nd6 Bxd6 5. cxd6 Qxd6 6. fxe5 Qe7
10-> 1:37 -0.03 1. ... Qc7 2. Re1 Bd5 3. f4 Rb8 4.
Nd6 Bxd6 5. cxd6 Qxd6 6. fxe5 Qe7
11 1:37 1/37* 1. ... Qc7
Stuart
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