Author: John Merlino
Date: 11:05:58 08/22/05
Go up one level in this thread
On August 21, 2005 at 20:59:32, Robert Hyatt wrote: >On August 21, 2005 at 14:08:54, Janos Keinrath wrote: > >>[D] rr4k1/3qbppp/3p1n2/n2Pp3/4PP2/1p2B1PP/1PN3B1/1R1QR1K1 w - - 0 24 >> >>In this position crafty played 24. Na1, but I don't understand why. >>On a1 the knight out of play, only attack black b3 pawn which is well >>protected, and until 43th move (almost 20 moves!) stands here. >>Every human player would play Na3. > > >Intuition says so. But the question is, is there some deep tactical problems >with Na3? For one Bd8, Bb6, Bd4 and the B2 pawn is under attack, and with the >knight being hit by at least the rook at a8, there may be a problem. I've not >looked yet. And as you might have noticed, I criticized the Na1 move myself. >But after looking at it during the game, I thought "OK, lets get rid of the >knight at a5 holding the b3 pawn. We have a bishop we can put on the knight. >Now we have the knight and queen already on b3, get the rook over and up, and >then bring the other rook over and up, and we can take the b3 pawn with the >knight and things look good again. Of course, black gets to play some moves in >there, and this long-term plan might not be reachable. > >It's an interesting position... CM9_R1 on an AMD 2500 prefers Na3, and doesn't even spend 10% of its total time looking at all other moves. It does, however, waffle quite a bit on what it thinks Black will respond with....Rb4, exf4 or Bd8.... Time Depth Score Positions Moves 0:00 1/3 -0.37 874 24.Na3 exf4 25.Bxf4 Rb4 0:00 1/4 -0.16 2849 24.Na3 exf4 25.Bxf4 Qa7+ 26.Be3 Qc7 0:00 1/5 0.06 11682 24.Na3 Rb4 25.Bd2 Ra4 26.Bxa5 Qa7+ 27.Kh1 Qxa5 28.Qxb3 exf4 29.gxf4 0:00 1/6 0.07 34832 24.Na3 Rb4 25.Qd3 exf4 26.Bxf4 Qa7+ 27.Be3 Qa6 0:01 1/7 0.07 120720 24.Na3 Rb4 25.Qd3 exf4 26.Bxf4 Qa7+ 27.Be3 Qa6 0:03 1/8 0.33 464431 24.Na3 Rb4 25.Qd3 exf4 26.gxf4 Qa4 27.Bd2 Rd4 28.Qe2 0:05 1/9 0.04 935075 24.Na3 exf4 25.Bxf4 Rb4 26.Qd2 Qa4 27.Qe2 Nc4 28.Nxc4 Rxc4 0:11 1/10 0.09 2141736 24.Na3 Rb4 25.Qd3 exf4 26.Bxf4 Bd8 27.Kh1 Bb6 28.e5 Rd4 29.Qb5 0:45 1/11 0.33 9877613 24.Na3 Bd8 25.Ra1 Qe7 26.Qe2 exf4 27.Bxf4 Bb6+ 28.Kh2 Nb7 29.e5 dxe5 30.Qxe5 1:31 1/12 0.13 20522508 24.Na3 Rb4 25.Bf2 Nb7 26.fxe5 dxe5 27.Rc1 Nd6 28.Bc5 Rba4 29.Qd3 Qb7 30.Rc3 3:32 1/13 0.15 49641515 24.Na3 Rb4 25.Bd2 Ra4 26.Qe2 exf4 27.Bxf4 Bd8 28.Qb5 Bc7 29.Rbd1 Qxb5 30.Nxb5 Bb6+ 31.Kh1 Nc4 32.Bxd6 Nxb2 jm
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