Author: Mike Byrne
Date: 11:27:16 05/27/02
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On May 27, 2002 at 02:13:40, pavel wrote: >Hi mike, very interesting match. >Can we expect to have the tweaked version of crafty after this tournament no >matter what the outcome of the score? > >regards >pavs If somebody wants it, sure. I am of the belief this version would not do as well in very short games- bullet and perhaps blitz. For example, Bob has "lazy exit" in his evaluate.c that cuts off the rest of the evaluate if the score is so "bad" anyway. Well I also do a "lazy exit" if the ply is < 9. It searches 9 ply in only a few seconds so to my thinking - it really doesn't matter in these "longer" games - but that would kill the engine in a short game. My extension settings are higher than his - this may also hurt the engine in a short game where you may only have a few seconds to make a move. I also go deeper - Bob's extensions bascially stop at 2*ply, mine stop at 2.5*ply. Again this may hurt the engine in a short game -and I think most people play these engines at short games - and the testers play the longer games ;>). I also tweaked the piece valuation settings - bascially increasing Bishops, Queens and Knights around 8% - leaving the rook setting alone. I also increased "king safety" - knowing that it would be playing a formidable opponent in Tiger. I'm not sure if any of my "tweaks" improve Crafty. Some of these tweaks I have used for years - but I have to be careful because sometimes what I am tweaking -- gets tweaked by Bob on a regular basis - thus I end up tweaking a tweak ;>). Mike
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