Author: Antonio Dieguez
Date: 06:47:55 11/14/01
Go up one level in this thread
On November 14, 2001 at 03:18:55, Uri Blass wrote:
>On November 13, 2001 at 23:51:33, Chessfun wrote:
>
>>On November 13, 2001 at 23:08:14, Robert Randolph wrote:
>>
>>>I am currently working on writing a new evaluation for my program.. I have been
>>>contemplating an eval based on positional aspects and no direct material count.
>>>
>>>For instance, a white knight on H1 would be worth maybe .2, but a white knight
>>>on E5 would be worth 3.2 Of course these are my actual eval values, but examples
>>>to better iillustrate my idea.
>>>
>>>Has this been done before with any success, or lack there of?
>>>
>>>If it was a plausible idea (as i beleive it could be) what would your
>>>suggestions be for positional advantages and disadvantages in this system, as
>>>they would be fairly differing than those of evals that also rely on material
>>>count.
>>>
>>>-Robert
>>
>>
>>TSCP Tom's simple chess program eval.c seems to address this
>>by adding the value of the location of the piece.
>>
>>If you have a look at eval.c you'll see the square value's
>>Tom used.
>
>Here is the piece square tables that Tom used
>There is no doubt that they can be improved.
>
>int knight_pcsq[64] = {
> -10, -10, -10, -10, -10, -10, -10, -10,
> -10, 0, 0, 0, 0, 0, 0, -10,
> -10, 0, 5, 5, 5, 5, 0, -10,
> -10, 0, 5, 10, 10, 5, 0, -10,
> -10, 0, 5, 10, 10, 5, 0, -10,
> -10, 0, 5, 5, 5, 5, 0, -10,
> -10, 0, 0, 0, 0, 0, 0, -10,
> -10, -30, -10, -10, -10, -10, -30, -10
>};
>
>Examples:
>I think that a knight at a1 is even worse then a knight at b1
of cors, the presented looks like a funny and cheap way to make it develop the
horse earlier.
Anyway I think (could be a bit wrong) a horse (not the bishop) is almost equally
bad in the first line in the opening and the rest of the game, so I don't think
to make a difference there is sooo correct neither.
>I also think that at a8 and h8 knights are often trapped so it is a good idea to
>have -100 value for these squares or maybe even -150(I did not test it so I do
>not know but -10 is clearly not negative enough).
>
>a1 and h1 are also bad squares for knights and I guess that giving knights in
>these squares -80 may be a good idea.
>
>
>Uri
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