Author: Joachim Rang
Date: 04:38:04 07/23/04
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On July 22, 2004 at 16:13:11, Peter McKenzie wrote: >Hi again and thanks for the responses. Here are some more thoughts on the >position. > >If h4 is played then it is likely that the following pawn structure is reached: > >[D]1k1r3r/ppp1q3/4bp2/2p3p1/3nPp1p/1PNP1P1P/P1PQB1P1/R3R2K w - - > >I think many programs misevaluate this pawn structure. For example, white is >probably penalised for having a backward pawn on g2, but is black penalised for >having a backward pawn on g5? Probably not, because the f6 pawn means that g5 >is not truly backward but in reality white's e4 pawn stops f6-f5 thereby making >g5 *effectively* backward. > >Also, this pawn structure (after h4 h3) makes it very hard for black to open up >the kingside. I'm open to suggestions on how to evaluate that though :-) >Anyway, with the more flexible structure of pawns on g5 and h5 white must always >be concerned about black starting an attack with g4. Once that threat is >removed it is easier for white to play actively on the queenside or in the >centre. > >thats all, >Peter I think it's a tough position for computers. Shredder 8 gives initially -1.64, but after you force 1...h4 2. h3 g5 the eval goes down and Shredder shows: 3.Na4 c4 4.bxc4 Bxh3 5.gxh3 Qd7 6.Bd1 Qxa4 7.c3 Qa5 8.Rb1 f5 9.exf5 Qxf5 10.cxd4 Qxh3+ 11.Kg1 Rxd4 12.Rxb7+ Kxb7 13.Qb2+ Ka8 14.Qxd4 µ (-0.77) Depth: 18/45 00:06:46 103335kN After 1...g5 2. Na4 we still have -1.29: Analysis by Shredder 8: 1. µ (-1.29): 2...Qd6 3.c3 Nc6 4.Rad1 h4 5.h3 Rhg8 6.Nb2 Qd7 7.Kg1 Rge8 8.d4 cxd4 9.Bb5 Rf8 2. µ (-1.13): 2...h4 but as you can see, Shredder wants to play h4 later and it seems to me that comps do not properly evaluate the pawn structure on the kingside.
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