Author: Tord Romstad
Date: 08:10:51 04/14/04
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Hi Martin! On April 14, 2004 at 10:35:26, martin fierz wrote: >On April 14, 2004 at 10:07:35, Tord Romstad wrote: > >>On April 13, 2004 at 20:39:23, Vasik Rajlich wrote: >> >>>Well, the most obvious explanation is that there's simply a speed vs knowledge >>>tradeoff. >>> >>>However, there are some interesting data points regarding evaluation functions. >>> >>>One is that Fruit is not so bad, considering that it apparently lacks the one >>>single most important middle game evaluation factor. (King safety.) >> >>Or even Crafty. Have you seen Crafty's king safety eval? I almost couldn't >>believe my eyes the first time I saw it. Apparently king safety is no longer >>very important if your engine is sufficiently fast. > >i use crafty 19.~6 as a sparring partner for my engine. it is far better than >muse of course. but i have seen *many* *horrible* moves by crafty, regarding >king safety. i never checked it's evaluation, and i don't intend to. Basically, what it does (except for some pawn shelter analysis) is to measure the geometrical distance of the enemy pieces to the king. Pieces are simply given a bonus for being located close to the enemy king. Whether they attack any important squares is hardly considered at all. >i just want to say that when crafty loses against muse, it is more often than >not that crafty's king safety eval seems bad to me. > >on the other hand, the main reason i decided to use attack tables in muse is for >king safety evaluation. they really pay off there, but the price i'm paying is >huge - i search even less nps than gothmog ;-) >i think writing a good king safety eval requires a lot of computation and then >you're just back to complex+slow or cheap+fast. Yes. But although attack tables are the most natural and obvious tool to use, and I use them myself at the moment, I think there are better and faster ways to evaluate king safety. I will experiment with other techniques in my new engine, and of course let you all know if I discover something useful. Tord
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