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Subject: Engines Evaluation of Position

Author: Christos Gitsis

Date: 12:03:13 06/07/05


This position from one of my games is winning for white.
It is not a usual test position, because there are many moves (probably most of
the moves) that lead to a win.

[D] 8/6p1/4p2p/5p2/2k5/P4P2/1K4PP/8 w - - 0 43

All human club players should know that the outside passed a-pawn is very
strong. It forces the black King to stay on the Queenside, allowing the white
King to reach the Kingside first.

Yet some strong engines don't evaluate the position correctly. Some give a very
small advantage to white and others even give a score favouring Black. The most
optimistic engines that I tried are Crafty and Zappa with a score of only +1.0
to +1.2.

Isn't it relatively easy to add knowledge about outside passed pawns, so that
the engines would evaluate this position correctly?



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