Author: Albert Silver
Date: 13:17:48 06/16/99
Go up one level in this thread
On June 14, 1999 at 23:58:53, John Stanback wrote:
>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
I put this to my engines in CB7 (with 16 megs hash on a K6-2/350) and here is
what I got:
Fritz 5.32 - Only places it first after 12 plies (after 11 it gives Bxh7+ a
-0.09 score): 1.Bxh7+ Kxh7 2.Qh5+ Kg8 3.Rf3 g6 4.Qh6 f6 5.Rg3 Nxe5 0.81/12
This takes it about 18 minutes.
Hiarcs 7.32 - Finds it after 8 plies in around 7 minutes: 1.Bxh7+ Kxh7 2.Qh5+
Kg8 3.Rf3 Nf6 4.exf6 Qxf6 5.Bc3 e5 6.Rh3 Qh6 7.Qxh6 gxh6 8.fxe5 Kh7 1.46/8
Junior 5.32 - After 3 hours it isn't even in it's top 4 choices.
Albert Silver
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