Author: Gerd Isenberg
Date: 13:43:33 09/29/05
Go up one level in this thread
On September 29, 2005 at 15:33:43, Robert Hyatt wrote: >On September 29, 2005 at 13:53:27, Gerd Isenberg wrote: > >>[D] r2qk2r/pp3ppp/2p1pn2/4n3/1b6/3P2PP/PPPN1PB1/R1BQK2R b KQkq - 4 1 >>>>11...h5 is very logical for computer to play. >>>>It increase the mobility of the rook at h8 so there is no reason for computers >>>>not to play it. >>> >>>Sorry, but I _totally_ disagree there. Most any decent computer chess program >>>has an evaluation component that covers the king-side pawn structure. Playing >>>h5 creates a pawn target for black to aim at. It weakens g5 and g6. So a >>>computer has to see something _else_ to more than offset that king safety issue. >>> >> >>Seems that Fruit doesn't care so much about pushing pawns on one wing, if the >>own king has still the option to castle to the other sheltered wing without >>enemy pawn advances there. >> >>The move is somehow committing and narrows black options to castle (kingside >>here) - but also, or even more, white castle options. >> >> >>>I suspect _many_ strong computers will _not_ play this move, for the reason >>>given above, since any long-term gain by the move is way beyond any search >>>horizon, and is going to be purely based on positional scoring numbers.. >>> >>>Mobility of the rook is a lousy reason for h5. Otherwise black would always be >>>playing a5 and h5 to give both rooks more mobility... >>> >> >>Agreed - but for the same reason, black king still has a nice shelter on the >>queenside and may castle queenside, rook mobility might be an issue here. >> >>Gerd > > >Would seem to me that white has that same "castle queenside" option open, >although it will take a couple of moves to prepare by getting development done >over there... > >Crafty has that same sort of "it is ok to disrupt pawns on one side if castling >to the other side is still an option, but it also used to have an anti-opposite >castling term to avoid very precise lines where it would have a chance to lose >one tempo and the game quickly after that... > >Still won't play h5, even the new non-asymmetric version that is being developed >right now... Fruit's initial found of h5 might be a "wrong" reason case, but the later pvs indicate that 0-0 is "difficult" for both sides (probably due to pawn shelter or pawn storm issues), and that black castles queen side with the white king still in center: 00:00:02.5 0.04 10 2475965 O-O O-O Nd5 Re1 Qc7 Qe2 Ng6 c3 Bc5 Nc4 00:00:04.2 0.11 10 4088578 h5 a3 Bd6 Ne4 Nxe4 Bxe4 f5 Bg2 Bc5 Bd2 Kf7 00:00:07.8 0.11 11 7518463 h5 Qe2 Bd6 f4 Ng6 Nc4 h4 f5 Bxg3+ Kd1 Nf8 Bd2 00:00:19.3 0.00 12 18830729 h5 O-O h4 d4 Qxd4 c3 Qb6 cxb4 hxg3 Qb3 gxf2+ Rxf2 Qd4 b5 00:00:41.3 -0.05 13 40615296 h5 O-O h4 d4 Qxd4 c3 Qb6 cxb4 hxg3 Qe2 Ned7 Nc4 gxf2+ Rxf2 Qxb4 00:02:17.0 0.00 14 133102696 h5 Qe2 Qc7 O-O h4 Ne4 Be7 Be3 Nd5 d4 Nxe3 fxe3 Nd7 Qf2 O-O gxh4 00:05:17.0 0.08 15 307648549 h5 Qe2 Qc7 c3 Be7 Ne4 h4 Nxf6+ Bxf6 g4 Ng6 Be4 Nf4 Bxf4 Qxf4 d4 O-O O-O 00:10:54.5 0.07 16 633368278 h5 Qe2 Qc7 c3 Be7 Ne4 h4 Nxf6+ Bxf6 g4 O-O-O d4 Ng6 Be4 Nf4 Bxf4 Qxf4 Qe3 Bg5 00:16:44.6 -0.02 17 977058195 h5 Qe2 Qc7 c3 Be7 h4 O-O-O d4 Neg4 Nc4 Nd5 O-O Bf6 f3 Nh6 Bxh6 Rxh6 f4 00:42:35.1 -0.02 18 -1805878841 h5 Qe2 Qc7 c3 Be7 h4 O-O-O d4 Neg4 Nc4 Nd5 O-O Bf6 a4 Kb8 Re1 Be7 Be4 01:17:57.7 -0.06 19 267945229 h5 Qe2 Qc7 c3 Be7 h4 O-O-O d4 Neg4 Nc4 Nd5 O-O Bf6 Re1 g6 Bf3 Kb8 Bd2 c5 Bxg4 hxg4 dxc5 Qxc5 Qxg4
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