Author: Antonio Dieguez
Date: 08:06:20 10/20/99
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On October 19, 1999 at 11:31:24, Robert Hyatt wrote: >On October 19, 1999 at 07:40:54, Antonio Dieguez wrote: > >>On October 18, 1999 at 16:55:42, Heiko Mikala wrote: >> >>>Hi Robert! >>> >>>>In crafty, 'razoring' is gone... I didn't like it overall and finally took it >>>>out forever... >>> >>>Good! That makes me feel much better in my ongoing experiments to eliminate >>>razoring from my own program :-) >>> >>>Heiko. >> >>am sorry, I know that many posts about razoring could have been posted but I >>have dont seen it, can you tell me whats that? >> >>thanks. >> >> >>me. > > >What I did was pretty simple. If I am 2 plies away from calling Quiesce() >(ie I am doing a 10 ply search and I am at ply=8), then I took a look at the >static evaluation (which includes material) and if that looked 'uninteresting' >and the current move I am about to try also looks 'uninteresting' (ie not a >check, nor a capture, nor a pawn promotion, or a passed pawn push, etc.) then I >reduced the depth by one ply (extra) which takes the search right to Quiesce and >saves one ply of effort. > >It is sort of the antithesis of extensions... where you extend interesting >lines, and reduce the depth of uninteresting positions. It can save time. And >it can hids tactics for one extra ply if the position appears to be unintersting >but actually is very 'sharp'. okey, I think I knew what were razoring since I have implemented them and at this moment exactly two plies before the extensions :) but its pretty simple now, and even the position is trowed away instantly, more risk so. A million of Thanks.
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