Author: Amir Ban
Date: 04:04:23 05/11/98
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On May 10, 1998 at 18:51:35, Vincent Diepeveen wrote: >36. axb5! > >This is a brilliant move, which i can easily explain >with DB kingsafety. There are several tens of pawns needed to make >a program play axb5! instead of Qb6. If your kingsafety however gives >white a huge penalty after the line given by GM Lubosh Kavalek >(Qb6 Rd8 axb5 Rab8 Qxa6 e4 and the black queen gets into the white >position driving white king to centre with queens on the board), then >this move is easily explainable, supposing that DB has singular >extensions >and can see here line of about 15 half moves among which a lot of checks >and forced moves. > This position was analyzed much more deeply than this. After 36.Qb6, Rd8 is indeed best, but DB did not consider it but 36...Qe7 (I posted the complete analysis recently). After 36... Rd8 37.axb5, a micro will quickly see that white is in trouble, but after 36...Qe7 37.axb5, black is a full pawn worse because of the need to protect the bishop on d6. Justifying 36.axb5 if you do not consider Rd8 is more than a few tenth of a pawn to justify, actually it's about a full pawn. Why didn't DB consider Rd8 ? Probably it saw 36. Qb6 Rd8 37.Be4 ! and it seems black is screwed. But black has a fantastic resource: 37... a5! 38.axb5 axb4!! sacing a piece, to get the queen to the first rank and force a draw on perpetual threats (echo of the final position, but more complicated). I showed this to Kasaprov last November, and was surprised to find that he knows about this. Actually he treated it derisively. He says after continuations of the sort axb5 Rab8 the queen should not take on a6 but retreat to f2 or e3 and white looks good. >24.b4? this move is a horrible positional concession. Lucky for DB >most PC > programs play it too. Kasparov disagrees. He says this move is necessary to avoid losing material. I didn't check, but I remember that Junior would have played it. This was raised when strategies for human intervention were discussed and Kasparov mentioned 24.b4 as a move where second-guessing the computer would be a bad mistake. Amir
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