Author: Harald Lüßen
Date: 12:44:51 03/27/04
Go up one level in this thread
On March 27, 2004 at 10:28:23, Robert Hyatt wrote:
>On March 26, 2004 at 16:38:35, Joachim Rang wrote:
>
>>I'm testing with an engine which allows to define an aspiration window, what are
>>common values?
>>
>>thx in advance
>>
>>Joachim
>
>
>+/- .4 to .5 has worked best for me. I've tried even +/- .25...
Does it make sense to start with a big window and narrow it?
bounds = 100; // a pawn
for ( iteration ... )
{
score = search(...)
bounds = max( bounds * 8 / 10, 10 );
...
}
And to be speculative: Can I assume that chess is nearly drawn
and I can always find good moves. If I am threatened and suffer
a fail low at my starting window around the evaluation score or
around 0 I need not change the window but the search depth. This
is part of the motivation of human chess players before the game.
"I am a stronger player than this guy and I can always draw!"
I don't believe it myself but why is this wrong (in practice)?
Harald
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