Author: Frank Schneider
Date: 12:09:05 08/31/98
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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? On a K6/200 Gromit likes Qe3 after 2:48 (but with a negative score) at ply 12 it gets a fail high which takes quite long to search (15 min) and then comes out with 'mate in 14'. Frank > >Enrique
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