Author: blass uri
Date: 10:19:20 01/28/00
Go up one level in this thread
On January 28, 2000 at 12:31:29, Shep wrote: >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). I do not understand. Do you mean to say that the only difference between tiger and fritz is in the size of the change in the evaluation? Can tiger show scores of +0.4,+0.5,+0.5 +0.46 and never showing +0.9 and after the expected moves scores of +0.9,+0.95,+0.93,+0.96? If it can than I see no difference between tiger and fritz (except the size of the change) It is possible that you meant that tiger can show something like depth 7 +0.4 depth 8 +0.5 depth 9 +0.5 depth 10-13 +0.9 and after the expected move it can show from depth 1 to depth 10 evaluations of +0.9? If this is the case than tiger is not a root processor but can have jumps in the evaluation because of being a processor of something that is not the root but close to the root. Uri
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