Author: Uri Blass
Date: 02:16:51 04/15/02
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On April 15, 2002 at 03:35:07, Slater Wold wrote: >[D]2r4k/1p3p1p/1pn2q2/1N1p1p2/8/PP2Q2P/5PP1/2R3K1 w - - 0 26 > >Why in this position is it not perfectly clear that taking the pawn (Qxb6) is >the obvious move? Instead I've noticed several programs wanting Qf4, a4, and >other moves that to me, just seem to waste time. > >I've spoken with one GM, (2550ish) and he agreed that Qxb6 is the only move that >he would emphasize on. (It was a quick discussion, no detail.) > >This is move 26 of game one in the first match between Deep Blue and Kasparov. >Deep Blue played Qxb6 and later won the game. > > > >**I've tested only a few "top commercial" programs. Most want Qf4, a4 and >others at first, and around 1:30 want Qxb6. My question was, why isn't this >obvious from the start?** It is not obvious from the start because black may get a king attack. The commercial engines are not so materialistic. For some engines it is obvious from the start but I guess that the new software has more knowledge in the evaluation than the old software so it is not obvious for it. This is the reason that it is obvious for Junior5 when it is not obvious for Junior7. I guess it was also obvious for the first Deep blue because that Deep blue is old software. New position 2r4k/1p3p1p/1pn2q2/1N1p1p2/8/PP2Q2P/5PP1/2R3K1 w - - 0 1 Analysis by Yace 0.99.56: 1.Rxc6 Qxc6 -+ (-2.03) Depth: 1 00:00:00 1.Qxb6 ² (0.66) Depth: 1 00:00:00 1.Qxb6 Qg5 ² (0.57) Depth: 2 00:00:00 1.Qxb6 Qb2 2.Re1 ² (0.60) Depth: 3 00:00:00 1.Qxb6 Qg5 2.Qe3 Rg8 ² (0.52) Depth: 4 00:00:00 1.Qxb6 Qg5 2.Qc5 Rg8 3.g3 ² (0.56) Depth: 5 00:00:00 16kN 1.Qxb6 Rg8 2.Rd1 Qb2 3.Rxd5 Qxb3 ² (0.69) Depth: 6 00:00:00 91kN 1.Qxb6 Rg8 2.g3 Qb2 3.Re1 Qxb3 4.Qxb7 ² (0.57) Depth: 7 00:00:00 192kN 1.Qxb6 Qb2 2.Re1 Rb8 3.b4 d4 4.Qc7 Kg8 ² (0.62) Depth: 8 00:00:02 757kN 1.Qxb6 Rg8 2.Qc5 Qg5 3.g3 f4 4.Nd6 Ne5 5.Qd4 f6 ² (0.52) Depth: 9 00:00:06 2504kN 1.Qxb6 Rg8 2.Kh1 Qe7 3.Qc5 Qg5 4.g3 f4 5.Nd6 Ne5 6.Qd4 ² (0.44) Depth: 10 00:00:16 6756kN 1.Qxb6 Rg8 2.Kh1 Qg5 3.Rg1 Qe7 4.a4 Rd8 5.Nd4 Qf6 6.Rd1 Kg8 ² (0.50) Depth: 11 00:00:54 22504kN 1.Qxb6 Rg8 2.Kh1 Qg5 3.Rg1 Qe7 4.a4 Rd8 5.Kh2 Kg8 6.Rc1 Re8 7.Qc5 Qxc5 8.Rxc5 ² (0.51) Depth: 12 00:02:13 53476kN (Blass, Tel-aviv 15.04.2002) New position 2r4k/1p3p1p/1pn2q2/1N1p1p2/8/PP2Q2P/5PP1/2R3K1 w - - 0 1 Analysis by Junior 5.0: 1.Qxb6 Qe7 ± (0.71) Depth: 3 00:00:00 1.Qxb6 Qe7 2.Rd1 Rd8 ± (0.81) Depth: 6 00:00:00 14kN 1.Qxb6 Qe7 2.Rd1 Rd8 ± (0.81) Depth: 6 00:00:00 18kN 1.Qxb6 Rg8 2.Re1 Qg7 3.g3 f6 = (0.16) Depth: 9 00:00:00 160kN 1.Qxb6 Rg8 2.Re1 Qg7 3.g3 f6 = (0.16) Depth: 9 00:00:00 328kN 1.Qxb6 ² (0.46) Depth: 12 00:00:08 6078kN 1.Qxb6 ² (0.46) Depth: 12 00:00:09 6638kN (Blass, Tel-aviv 15.04.2002) Uri
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