Author: Harald Faber
Date: 03:23:32 04/27/99
Go up one level in this thread
On April 27, 1999 at 05:25:57, Jeremiah Penery wrote: >>>Hoped you enjoyed the problem... >>>Igor >> >>Yes, I did. I also enjoyed this problem: >> >>qnb5/1p1kBK2/pPp5/P1p5/2P5/8/8/8 b - - 0 0 >> >>White to move and win. It SHOULD be an easy one, only move#2 and the motive must >>be found. >>What amazes me is that Crafty and Fritz5.32 with their deepest search depth >>don't find the final winning move in move#19 pv. They have only a draw eval so >>it must be the best move because the material is way down, or are there other >>reasons? It is 19.Be5 which is found by them with 0.00, just facing that move. >>If you make 19.(winning move) SUDDENLY they realize the win but not 19.Be5 up to >>depth 60! > >I followed the line you gave below, and it looks like the problem is that Crafty >seems to really want to take the draw by repetition (for both sides)...I set the >drawscore to -9.99 and it still had some trouble, but it did much better. Like >Uri said in his post, it could be a null-move problem as well. I admit I never thought such things are possible in current programs.
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