Computer Chess Club Archives




Subject: Re: evaluation tuning tricks

Author: Renze Steenhuisen

Date: 08:02:13 03/17/04

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On March 17, 2004 at 05:26:50, milix wrote:

>On March 17, 2004 at 04:58:06, Peter Alloysius wrote:
>>what are tricks for evaluation tuning so that it could
>>search less nodes?
>>i noted that my engine use exactly same move ordering scheme as
>>crafty but it still search much more nodes.
>>my engine also use adaptive null move, and futility pruning.
>>so i think the problem is on evaluation tuning.
>>i heard that tuning evaluation function can reduces node searched,
>>so what's the trick?
>I think that there is no special trick. A bad evaluation will missguide the
>search. When I turn off the positional evaluation (and have only material+piece
>square scores) my engine is doing too many researches and the move ordering is
>also very bad. Same effect if I alter a positinal characteristic too much, like
>giving a very big bonus in advanced pawns or penalize bad king safety too much.

If you turn positional evaluation off, what are typical numbers for
move-ordering? Because this is exactly what I do for now, but the History
Heuristic nor Killer Heuristic don't give very nice move-ordering %'s!



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