Author: Richard Pijl
Date: 08:49:15 03/23/04
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On March 23, 2004 at 09:11:14, martin fierz wrote: >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? > >IMO this question is not the right question to ask. i think gothmog is rather >good at giving up the exchange compared to other programs. it's static eval for >this position would be quite ok if the white bishop was on c1 for example, where >it's mobility is apparantly only very little bigger (one more square to go to). >therefore you have to ask not only what the static eval for the position is that >you gave, but also for the one with the bishop on c1. many engines will give >black a clear edge here because they are (too) materialistic. they will do this >in both positions. the really interesting question is whether any engine can >detect the HUGE difference between having the bishop on c1 or g1... The Baron doesn't see a big difference in static eval, the value is even slightly worse for the bishop on c1. But after a short search it makes quite a difference. Current Development version Original position static: -0.77 After short (10 ply search): -1.5 Bishop on c1 static: -0.87 After short (10 ply search): -0.9 The difference in score is purely because of mobility of the bishop (and rook, when looking at the static eval). Richard.
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