Author: Martin Giepmans
Date: 14:46:55 12/30/01
Go up one level in this thread
On December 30, 2001 at 16:55:41, Jeroen van Dorp wrote:
>[D]r1b2r2/3pNpkp/3pn1p1/2pN3P/2PnP3/q3QP2/4BKP1/1R5R w - - 0 1
>
>This is a problem: white to move and win.
>When looking at it, (as a human, of course:)) you immediately start thinking
>about h6+ or Qh6+ followed by hxg6+ looking at the two rooks comfortably with an
>open h-file, and the knights "checking" the mobility of the black king.
>
>All engines I tested started however with Qd2, and almost all switched to Qh6+
>very soon on my PIII@840: Gandalf 5, 47 seconds, CT 14.0 34 seconds, Shredder 6
>32 seconds , Hiarcs 7.32 in 54 seconds, Nimzo 8 saw the mate in 20 seconds,
>Junior 7 in 39 seconds, and Fritz 7(both MMX (7a) and no-MMX)... didn't find it
>but after some 6 minutes, and found the mate in 9 minutes 41 seconds.
>
>What could be the reason?
>Are there people here willing to check it with Fritz on faster machines? BTW not
>only looking for the *move* Qh6+ but for the move *and mate* with Qh6+
>
>
>[Event "?"]
>[Site "?"]
>[Date "2001.12.30"]
>[Round "?"]
>[White "?"]
>[Black "?"]
>[Result "*"]
>[Opening ""]
>[Setup "1"]
>[FEN "r1b2r2/3pNpkp/3pn1p1/2pN3P/2PnP3/q3QP2/4BKP1/1R5R w - - 0 1"]
>
>1.Qh6+ Kxh6 ( 1...Kh8 2.hxg6 Qxf3+ 3.gxf3 Nxf3 4.Qxh7# ) 2.hxg6+ Kg5 ( 2...Kg7
>3.Rxh7#) 3.Rh5+ Kxh5 $8 4.f4+ Qf3+ ( 4...Kh4 5.Rh1+ Qh3 6.Rxh3# ) 5.Bxf3+ Nxf3
>6.Rh1+ Nh4 7.Nf6+ Kh6 8.Rxh4+ Kg7 9.Ne8+ Rxe8 10.Rxh7+ Kf8 11.Rxf7# *
Indeed surprising that the "tactical wizard" Fritz is so slow here.
I guess the programmers use too many nullmoves.
On an amd 1200 my engine needs only two seconds to find a mate:
SpiderChess
05 00:00:00 + 0.63 E3xA3 A8xA3 D5-B6 D4xE2 H5-H6 G7-F6 E7-D5 F6-E5 F2xE2
00:00:00 + 0.65 H5xG6 A3xE3 D5xE3 F7xG6 B1-B6 A8-A2
06 00:00:00 + 0.54 H5xG6 A3xE3 F2xE3 F7xG6 E7xC8 A8-A3 E3-F2 F8xC8
00:00:00 + 0.75 E3xA3 A8xA3 H5xG6 F7xG6 E7xC8 F8xC8 B1-B7 G7-G8
00:00:01 + 0.95 E3-D2 G6-G5 D5-B6 D4xE2 D2xE2 E6-D4
00:00:02 Mat 11 E3-H6 G7xH6 H5xG6 H6-G5 H1-H5 G5xH5 F3-F4 A3-F3
E2xF3 D4xF3 B1-H1 F3-H4 D5-F6 H5-H6 H1xH4 H6-G7
F6-E8 F8xE8 H4xH7 G7-F6 H7xF7
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