Author: James T. Walker
Date: 18:15:04 12/22/00
Go up one level in this thread
On December 22, 2000 at 15:52:19, Ernst A. Heinz wrote: >>On December 22, 2000 at 14:45:03, Ernst A. Heinz wrote: >> >>>>Did you look at what happens if you play a4? Your kingside gets totally >>>>shredded, starting with Qxf7+... >>> >>>Yes, true -- but then Black's King is not standing there! >>> >>>It rather seems quite safe on d8 while White's King gets >>>into mighty trouble on d1 after the sequence a4 - Qxf7+ - >>>Kd8 - Qxg7: >>> >>>[d]2rk3r/6Q1/4p3/1pqpP3/p3b1PP/1B6/PPP2R1R/2K5 b - - 0 1 >>> >>>"DarkThought" quickly scores this as substantially positive >>>for Black, locking onto Qe3+ as the best move almost instantly. >>> >>>=Ernst= >> >>I have no doubt that black might actually be winning here. But that wasn't >>the point. You said you picked a4 at depth=10. For that to happen, you have >>to ignore king safety and sit in the middle of the board, with a queen at f7, >>a rook on the open file, the king rook hanging, the king can't move to connect >>the rooks, etc. >> >>IE at 10 ply it is all judgement, not "truth" as the search probably can't see >>the final outcome. > >"DarkThought" gets a fail-low on 0-0 in iteration #10 with the >score dropping from +1.1 in iteration #9 to just +0.39. Then, >it locks onto a4 and shows the correct PV for it already in >iteration #10 (with the white King being driven to d1 where it >is similarly exposed as the black King on d8). > >So, why should that mean to ignore king safety or all the other >evaluation stuff you are talking about above? > >To me, it simply looks like our search picks up the crucial >threats earlier (maybe, by means of more appropriate extensions >in this particular case) -- no more, no less. > >=Ernst= Folks, that's what makes a chess game. Differing opinions on how to proceed. Jim
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