Author: Enrique Irazoqui
Date: 06:09:45 09/03/98
Go up one level in this thread
On September 02, 1998 at 16:21:15, Bruce Moreland wrote: > >On September 01, 1998 at 15:57:49, Djordje Vidanovic wrote: > >>Bernhard Bauer claims that this kind of position NEVER occurs in real games... >>But it does -- therefore I AM taking his claim *cum grano salis* :-) >>Anyway, here goes: >> >>>[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? > >Mine doesn't find this. I sacrifice some of the freakish cases. This is not such a freakish case. There are hundreds of games with King+Queen vs. King+pawns. An example among many: Benko-Byrne, 1958 7K/3P1P2/8/7P/8/8/5P2/kq6 b - - 0 62 >My thinking is >that I would rather miss a few wins than find all of the losses. In this case you got a 50% success... :) >Hopefully I am not also sacrificing the non-freakish cases. > >Genius seems to have some stuff in it that lets it find some null-move killer >positions quickly. I'm surprised that Shredder finds it. I don't know about >Rebel. But this was my point when I posted this position. Genius, Rebel, Shredder, CM5K and others find quickly the right move, and don't tell me they are not nullmovers. But maybe more accurate nullmovers than others? Enrique >bruce
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