Author: Richard A. Fowell (fowell@netcom.com)
Date: 12:39:53 09/04/98
Go up one level in this thread
On August 30, 1998 at 09:46:29, Enrique Irazoqui wrote:
>[Event ""Rigasche Rundschau""]
>[Site "?"]
>[Date "1907.??.??"]
>[Round "?"]
>[White "Behting"]
>[Black "?"]
>[Result "1-0"]
>[SetUp "1"]
>[FEN "8/8/8/5pp1/8/1K6/2pp1Q2/2k5 w - - 0 1"]
>[PlyCount "5"]
>[EventDate "1907.??.??"]
>
>1. Qe3 f4 2. Qf2 d1=Q (2... f3 3. Qe3) 3. Kc3 f3 4. Qe3+ Kb1 5. Qb6+ Kc1 6. Qb2#
>1-0
>
>This is a relatively simple position where white wins in 12 plies or less, but
>several programs fail to find Qe3, even after a search deeper than 12 plies.
>
>After at least 5 minutes on a PII-400 with 256 MB RAM, Hiarcs 6, Fritz 5, Mchess
>7.1, Nimzo 98, Crafty 15.17, Exchess 2.34 and Junior 4.6 don’t find the
>solution. Junior plays instantaneously Kc3?? and announces mate in 4,
>overlooking the obvious underpromotion d1N+.
>
>Time to find Qe3 with a winning evaluation:
>Genius 5W, 13 secs.
>Rebel 9, 30 secs.
>Rebel 10, 24 secs.
>Shredder 2, 24 secs.
>
>Strange that there is so much difference between programs in this position.
>
>What would Ferret, Dark Thought and others play?
>
>Enrique
Both of my favorite freeware Mac chess programs find Qe3 quickly.
On my 180Mz 604e system:
MacChess 4.0: stays with Qe3 after 5 seconds.
Eval goes positive at 7 seconds,
rises above +1 pawn at 68 seconds.
(4Mb hash)
Sigma Chess Lite 4.0: stays with Qe3 after 6 seconds.
Eval goes postive at 15 seconds (+2.9 pawns).
Eval goes to +6.5 pawns at 70 seconds.
(Note: both programs available through <http://www.gambitsoft.com/mac.htm> )
Richard A. Fowell (fowell@netcom.com)
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.