Author: Amir Ban
Date: 05:53:27 01/15/98
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On January 15, 1998 at 08:01:10, Robert Hyatt wrote: >On January 15, 1998 at 05:35:18, Amir Ban wrote: > >> >>Maybe we can break the problem into two easier parts: >> >>- Who sees a plus score for Qxb3 ? >>- Who sees a draw score for only shuffling the queen ? >> >>Amir > > >I disagree. I have seen Cray Blitz and Crafty win many such positions. >It >takes a lot of time, but being ahead +12 is *not* going to draw if the >program >understands the 50 move rule and repetitions. IE sooner or later it is >going >to see that another couple of queen moves draws. And it is going to >then >search for a way to push a pawn, or capture something. Being ahead +12 >is >enough to allow the queen sac and still remain far enough ahead in >material >to win. > >In 1986 we had a game somewhat like this at the WCCC in Germany. Except >we were only up 1.5 pawns or saw. After about 30-35 moves of shuffling, >Cray Blitz found what we already knew... it had to give up its pawn, but >then could win. It did, but only when urged on by the threat of a draw. >I think many programs would win this, assuming the game is played for >another 45 moves. +12 is simply not going to draw. Now if we are into >"elegant" wins, and if this has to be solved *now* or never, then we >have >a problem. But I've never seen a +12 position that wasn't winnable, >except for a few that are close like Q vs bp... Very well. So how about this discount: Set the 50-move counter to something close to 50 and find the winning PV. Amir
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