Author: Peter Fendrich
Date: 05:51:31 03/23/04
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On March 23, 2004 at 04:35:49, Tord Romstad wrote: >[D]k1r5/p5n1/1prp3p/5p2/P1PPp1pP/2P1P1P1/3KBP2/1R4B1 w - - > >This position occured in a blitz game on the ICC with Gothmog (white) against >Arasan. Of course, as is immediately obvious to a human observer, white is >dead lost. It's impossible to activate the bishop on g1, and white is >effectively a rook down. > >To my disgust, Gothmog was quite happy about its position, and showed a small >plus score. And because Arasan appeared to be equally clueless about the >position, Gothmog even went on to win after a really ugly endgame. > >After the game, I decided to check Gothmog's static eval for the position. >It thinks that white has an advantage(!) of 0.24 pawns. Of course it >notices the bad mobility for the bishop on g1, but it doesn't understand >that it will never be possible to activate the bishop without loss of >material. > >How do other engines evaluate this position? > >Tord Terra gives -0.57 mostly due to the rook pressure on the c-line. The bishop is only punished by -0.15 due its bad position. I don't count mobility much... A search doesn't change it. It varies between -0.60 and -0.70 for white. I have seen a few cases like this in practical play and put on my todo-list to detect these things but only trig for certain pawn chain patterns. On the todo-list it stays... /Peter
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