Author: Robert Hyatt
Date: 14:33:13 07/23/98
Go up one level in this thread
On July 23, 1998 at 15:24:32, Moritz Berger wrote: >On July 23, 1998 at 12:58:20, Robert Hyatt wrote: > >>The major move that Crafty didn't like was the Qh5+ move which traded the knight >>on h8 for black's remaining two pawns. Crafty has specific eval code that says >>if it is down a piece, even with three pawns for it, it isn't going to be happy >>unless all the pieces are gone except for that one extra piece for the opponent. >> >>In every game I have ever played with a computer, being down a piece with a >>couple of rooks bishops and queens on the board has resulted in the side that >>is down a piece losing the game. I've tried to stop this. Perhaps here Qh5 >>is a good move, but my eval dropped sharply after that. >> >>I thought that Rebel would win this after it had such a wall of pawns left on >>the kingside, but it never seemed to try to get them moving, and a wall of pawns >>on the 2nd/3rd ranks is not nearly so impressive as that same wall of pawns on >>the 5th-6th... >> >>Interesting decision by Anand to start that Bd6 sequence. > >I analyzed the position with Shredder 2 on a PII-400 (96MB+32MB=128MB HT) > >Compare the evals for Qh5+ and Qh3, they're pretty close (I let Shredder do >restricted searches on both moves). So Rebel isn't the only program that >evalutes Qh5+ as playable: > > 9 -> 0:15.21 +1.89 Qh5+ g6 Qh3 cxd4 cxd4 Bxe4 O-O Bf5 Qh4 Rd8 (1.437.551) > 9 -> 0:12.75 +1.88 Qh3 cxd4 cxd4 Bxe4 O-O Bf5 g4 Be4 Rfe1 (1.277.960) > >10 -> 0:33.76 +1.85 Qh5+ g6 Qh3 cxd4 cxd4 O-O-O O-O Rxh8 g3 Qd6 gxf4 Bxe4 >(3.240.704) >10 -> 0:36.51 +1.81 Qh3 cxd4 cxd4 Bxe4 O-O Bf5 Qh4 Kf8 g3 Kg8 Qxf4 >(3.625.187) > >11 -> 2:24.21 +1.61 Qh5+ g6 Nxg6 hxg6 Qxg6+ Qf7 Qxf7+ Kxf7 g3 Bh6 f3 Rd8 >dxc5 Rc8 a4 (13.517.312) >11 -> 4:31.32 +1.76 Qh3 cxd4 cxd4 O-O-O O-O Rxh8 g3 Bh6 Qxe6+ Qd7 Qb6 Qc6 >Qxc6+ (26.224.808) > >12 -> 8:25.45 +1.58 Qh5+ g6 Nxg6 hxg6 Qxg6+ Qf7 Qxf7+ Kxf7 g3 Bh6 f3 Rd8 >dxc5 Be3 (44.284.606) >12 -> 13:38.96 +1.64 Qh3 cxd4 cxd4 O-O-O O-O Rxh8 g3 Bh6 Qxe6+ Qd7 Qxd7+ >Kxd7 (80.963.520) True.. but there are other quite playable moves also. Many programs (Crafty, Genius, DiepX, CSTal) were suggesting g3 after deeper searches, although Crafty liked O-O for a couple of seconds early on... But Qh5 trades away too much, IMHO.
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.