Author: Peter Fendrich
Date: 07:50:21 03/23/04
Go up one level in this thread
On March 23, 2004 at 10:41:32, Uri Blass wrote: >On March 23, 2004 at 10:14:05, Tord Romstad wrote: > >>On March 23, 2004 at 09:11:14, martin fierz wrote: >> >>>On March 23, 2004 at 04:35:49, Tord Romstad wrote: >>>> >>>>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. >> >>That's a kind way to put it. :-) >> >>I would rather say that Gothmog values the exchange too little, and gives >>it up too often. It sacrifices the exchange more often than any other engine >>I have seen, and I am fairly sure it loses more games than it wins because >>of this. >> >>>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... >> >>One of the really embarassing things about Gothmog's eval of this position >>is that it doesn't even consider the bishop on g1 to be a bad biship. My >>bad bishop eval is based on the number of *blocked* pawns on squares of the >>bishop's colour. In the position we discuss, there are only two such pawns >>(on e3 and g3). Therefore Gothmog thinks that the g1 bishop isn't really >>that bad. It has limited mobility, but it should be easy to relocate it >>to a better square. >> >>As so often, Gothmog's eval proves to be the worst of them all. > > >Movei never evaluate bad bishops(it only use the number of legal moves for >mobility evaluation so it indirectly evaluates bishop g1 as bad). > > > It's >>depressing to think about how many clock cycles I spend misevaluating >>positions so badly. >> >>Tord > >I do not thik that Gothmog's evaluation is so bad. >After all Gothmog won the game and I guess that Arasan's evaluation is probably >worse later in the game(same for movei that evaluate the endgame when arasan >bishop cannot stop the passed pawns as better for arasan). > >Uri Without really knowing, I think that Goth's real strength is in the search and not that much the evaluation. It can't be that bad of cource but I imagine it's not in the same legue as the search. /Peter
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