Author: Enrique Irazoqui
Date: 02:02:30 08/31/98
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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 >James
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