Author: Vincent Diepeveen
Date: 06:10:54 05/30/01
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On May 29, 2001 at 14:48:06, Uri Blass wrote: I guess what you basically want to know Uri are the moves that first failed high for black on a depth n , but now at a depth n+1 they fail low for black! Kxg7 is such a move! So basically moves flipping from >= beta to <= alfa is what you want to know. However in a search that big we talk here about quite some moves. Suppose 2 million moves that flip in this huge search from >= beta to <= alfa. Is that what you want to see on the screen? How big must your screen be? The main problem is that search works perhaps a bit different as you think it does. Bxg7 Kxg7 now white has say 40 legal moves. That means that black after all these moves has 40 moves that give a cutoff for it! In short in a search you need more or less branching factor to the power depth, that's the number of moves that gave a cutoff! So you definitely don't want the cutoffs only. You want the flips from >= beta to <= alfa. But here lies the problem. the programs main variation is based upon loads of moves. You want to see a line which an intelligent person like Uri wants to consider. Already a year or 55 ago it was estimated that strong players are considered to have a branching factor of 1.76 Now you want as a human to see usually 1 move and sometimes 2 moves. How is the computer going to figure out what moves out of the 40 legal moves you want to see? Best regards, Vincent
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