Author: Dieter Buerssner
Date: 13:21:53 06/07/05
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On June 07, 2005 at 15:03:13, Christos Gitsis wrote: >Isn't it relatively easy to add knowledge about outside passed pawns, so that >the engines would evaluate this position correctly? It is easy to add high scores for outside passers. But it is not clear, when it is good. It comes with more problems. Often the outside passer has to be sacced, while you king walks to the other side and eats opponent pawns. So, to make progress, in theory you must not give the outside passer a value higher, than positions that follow, where the outside passer is gone, but your king is much better centralized (you not only lost that large passed pawn score, but also the material). Of course, search depth can help (as it does already in your position). Giving very high positional scores, has the danger of possibily introducing a large error. With too high outside passer score, it really can happen, that the engine defends the pawn (when it is futile) and will not make any progress. I believe, the following position (I just took away a pair of pawns) is draw: So, how to evaluate the outside passer now? Giving concrete rules, that work well, will be difficult. Giving human reasoning might be easier - but it probably will be too "ad hoc" and referring to a concrete position, to be really useful for coding. [D] 8/6p1/7p/5p2/2k5/P7/1K4PP/8 w - - Regards, Dieter
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