Author: Sune Larsson
Date: 15:07:37 12/25/02
Go up one level in this thread
On December 25, 2002 at 17:57:15, Scott Gasch wrote: >On December 25, 2002 at 16:31:55, Uri Blass wrote: > >>On December 25, 2002 at 16:18:20, Scott Gasch wrote: >> >>>On December 25, 2002 at 13:09:45, Sune Larsson wrote: >>>> >>>> 5rk1/1ppq1rb1/p2p1nn1/3Pp3/2P1Ppp1/PPN3P1/3BQPB1/2R2RK1 w - - 0 25 >>>> >>>... >>>> >>>> CM 9000Utz12 25.Qd3 -0.15 Ply 14 64 Mb hash >>>> Shredder PB 25.Qd3 -0.28 Ply 14 128 Mb hash >>>> Hiarcs 8 25.Qd3 -0.55 Ply 13 128 Mb hash >>>> Fritz 8 25.Qd3 -0.59 Ply 14 128 Mb hash >>>> Ruffian 25.Qd3 -0.69 Ply 14 128 Mb hash >>>> Chess Tiger14 25.Bh1 -1.50 Ply 14 96 Mb hash >>>> GambitTiger 2 25.Qd3 -2.26 Ply 14 96 Mb hash >>>> >>> >>> Monsoon -1.17 for white static eval at root >>> Monsoon 25. Qd3 -4.18 Ply 14 512 Mb hash >>> >>>If possible, monsoon is too pessamistic about this position? It is unhappy with >>>white's position when I run a static evaluation of the position and when I let >>>it search it gets worse and worse. By ply 14, as you can see, it's much more >>>unhappy than any of these better engines. >> >>Can you explain how do you get -1.17 static evaluation? >> >>material is equal and no squares near the king are attacked by black pieces. >>I also do not see significant mobility advantage for black(white has 31 moves >>and after Qd3 black has 34 moves). >> >>A possible reason to see big adantage for black is mobility of the bishop after f3 Bh1 but you need 2 plies for that and you cannot see it by static evaluation. >> > >Monsoon thinks: > >Black has a slight edge in pawn structure, mainly because of perceived defects >on white's structure at c4 and f2. > >White's knight at c3 is scored a bit better than either of black's knights. > >White's bishops are both penalized because the position looks somewhat closed >and neither has very good mobility. I will not count f3, e3 or h3 as mobility >squares because of the black pawns on f4 and g4. I will not count f4 as a >mobility square because of the pawn at e5. > >Black's rooks are positioned strongly to attack white's king and support the >pawn storm. > >White's king safety penalty is higher than black's because black has more pieces >defending the king. White has a pawn storm to worry about while black does not. > >That's about it. The largest terms in the static eval are: poor white king >safety and poor white bishops. My bishop pair bonus is very large but in this >case it is overwhelmed by the other bishop penalties. > >Scott Thanks for the explanation! A very nice summary that sheds some light to the question why engines evals differ in this position. /s
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