Author: Christophe Theron
Date: 17:34:13 03/30/98
Go up one level in this thread
On March 30, 1998 at 13:09:34, Jon Dart wrote:
>Recently my program "Arasan" played a game on FICS against
>"noro", and reached the following position:
>
>8/8/5R2/r5P1/8/p5P1/K5kP/8 b - -
>
>Here the computer played Rxg5 and eventually lost. It appears
>that Kxh2 draws (Crafty finds Kxh2 right away. The analysis
>goes Kxh2 g6 Rg5 Kxa3 Kxg3 Kb4 Kg4 Kc4 Kh5 Kd4 Rxg6).
>
>This isn't really hard, but it helps if the program knows
>the passed pawn is not dangerous even though the king is
>behind it. It looks to me like Crafty has special case
>code for just this ending (in EvaluatePassedPawns).
>Genius 5.0 also likes Kxh2 after a short search. I'm
>wondering if any other programs find this difficult.
>
>--Jon
Chess Tiger settles for Kxh2 in about 74 seconds with a score of -0.12.
Rxg5, the previous considered move, had a score of -1.25 at that time.
Not very satisfying. This position is really interesting because it
shows a common case that happens quite often in rook endgames. Being
able to solve this quickly should give a real advantage in rook & pawns
endgames.
I keep it in my private collection. Thanks.
Christophe
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.