Author: Shep
Date: 09:31:29 01/28/00
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On January 28, 2000 at 11:31:29, Amir Ban wrote: >On January 28, 2000 at 05:25:26, Shep wrote: > >>On January 27, 2000 at 10:40:05, Jari Huikari wrote: >> >>>Where you consider the position of a game changes to middle game / end game? >>> >>>opening == most pieces haven't moved yet ? / opening book not ended yet ? >>>end game == few pieces left ? >>>middle game == neither of the two above ? >> >>I suppose some programs have a more fine-grained approach to this. >>Tiger for example divides the game into several "phases" (more than 3 for sure >>:) according to the material on the board, and different evals >>(/extensions/pruning/...?) are fired off according to the phase the program is >>in. >>In the DOS version, it would show "Phase x/y"; in Rebel Tiger, the best way to >>see it is when the eval suddenly jumps from like "+1.10" to "+0.20" (or vice >>versa) after a capture has occurred. (Contrary to Fritz, this is _not_ due to >>any preprocessor oddities. :) >> > >Why isn't it like Fritz ? It sounds exactly the same. It does not happen to Tiger that he says "+0.00" and then after the next capture, shows "-3.00" immediately. That would be a result that has been reported repeatedly about Fritz. Tiger's eval may go up or down a bit, but it does not miss losing moves just because it was "in the wrong phase". So I suppose there's a difference between the preprocessing Fritz employs and the things Tiger does between phases. Of course I cannot point the finger to it, not knowing either program's source code, but I figure that Tiger's approach is different (besides, such drastic eval changes (1 pawn or more) are _extremely_ rare for Tiger). --- Shep
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