Author: blass uri
Date: 02:07:20 08/31/98
Go up one level in this thread
On August 31, 1998 at 05:02:30, Enrique Irazoqui wrote: >On August 30, 1998 at 18:40:51, James Robertson wrote: > >>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? >>>seconds on my P233. Is there a forced mate in 12 plies? Chessmaster after 13 plies and 5 minutes 30 seconds still thinks White is ahead only by 8.24 points. >>>Enrique >> >>I tried the Chessmaster 5500 on this problem and it came up with Qe3 in 9 >>Arasan 4.1 finds the solution after 1 minute 21 seconds, and 11 plies >>(Chessmaster 5500 took only about 9 plies). Are you sure there isn't something >>wrong with the FEN position you gave or something? It seems unlikely that the >>programs on your PII 400mhz would do so poorly, compared with the success on my >>P233. > >I am sure the FEN is right and I was surprised myself. That's why I posted this >position... > >Enrique I am not surprised because it is a null move problem and white must see an underpromotion(this is rare in real games) Uri > >>James
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