Author: John Stanback
Date: 20:58:53 06/14/99
Go up one level in this thread
On June 14, 1999 at 14:14:21, Jeff Anderson wrote: >Even most beginners learn to recognize when to play the Bxh7 sac, but for some >reason not one of my engines, commercial or freeware considers it in the >position below. Even if the win is beyond its horizon, shouldn't most programs >use tecniques to analyse lines like these deeper (extensions I think they are >called.) This theme so common, wouldn't it perhaps even be in the programs >interest to recognize positions where it could work so they can play it, and not >fall victim to it? >Here is such a position where my expensive programs fail to even consider the >move. > >r1b2rk1/3pqppp/p1nNp3/3nP3/5P2/1N1B4/1PPBQ1PP/5RK1 w - - 0 18 I was sort of surprised that Zarkov finds Bxh7 in 2 minutes, 40 seconds on a K6-333. The score isn't all that high though so it's probably a king safety heuristic that's helping. Here's the output: 00:01.0 35456 5> -17 c4 Nc7 Qe4 Qh4 Nc5 00:02.0 84157 6> -17 c4 Nc7 Qe4 Qh4 Nc5 00:02.3 103168 6 -40 c4 Nc7 Qe4 Qh4 g3 Qh6 00:02.6 115584 6 -22 Nxc8 Raxc8 Bxa6 Ra8 Bc4 Ndb4 Be3 00:07.0 364630 7> -22 Nxc8 Raxc8 Bxa6 Ra8 Bc4 Ndb4 Be3 00:07.7 410496 7 -23 Nxc8 Rfxc8 Bxa6 Rcb8 Bc4 Nc7 Qd3 00:23.2 1324777 8> -23 Nxc8 Rfxc8 Bxa6 Rcb8 Bc4 Nc7 Qd3 00:24.7 1429120 8 -30 Nxc8 Rfxc8 Bxa6 Rcb8 Bc4 Ra2 Bxd5 exd5 Bc3 00:29.4 1703296 8 -26 c4 Nc7 Qe4 g6 Nd4 Rb8 Bc3 Nxd4 Bxd4 00:58.2 3350016 8 -18 Be4 f6 c4 Nc7 Na5 fxe5 Qd3 h6 Nxc6 dxc6 fxe5 01:12.7 4216995 9> -18 Be4 f6 c4 Nc7 Na5 fxe5 Qd3 h6 Nxc6 dxc6 fxe5 01:58.2 6579328 9 -4 Be4 f6 c4 Nc7 Na5 fxe5 Qd3 h6 Nxc6 dxc6 Bxc6 02:40.6 8674844 9 34 Bxh7+ Kxh7 Qh5+ Kg8 Rf3 g6 Qh6 Qxd6 exd6 Rb8 Na5 03:05.4 9838080 9 52 Bxh7+ Kxh7 Qh5+ Kg8 Rf3 Nf6 exf6 Qxf6 Rh3 Qh6 03:28.6 11108858 10> 52 Bxh7+ Kxh7 Qh5+ Kg8 Rf3 Nf6 exf6 Qxf6 Rh3 Qh6 John
This page took 0.01 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.