Author: Uri Blass
Date: 22:10:05 07/25/02
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On July 26, 2002 at 00:54:10, Slater Wold wrote: >[D]8/pR4pk/1b2p3/2p3p1/N1p5/7P/PP1r2P1/6K1 b - - 0 31 > >The only move to make here is Rxb2. The win is only about 10 moves away, and >while some programs I tested find Rxb2, none have an impressive score. And >that's *if* they find it. > > >[D]8/pR4pk/1b5p/2p5/N1p2P2/6P1/PP1r2P1/6K1 b - - 0 29 > >Same position. Only slightly deeper. No program I tested can find Rxb2. old crafty can see it in less than 1 second but forgets it later. I guess that finding Rxb2 is an evaluation question and I suspect that some programs can find it. Black gets Queen for rook knight and pawn and it is not clear if it is a good deal. Analysis by Crafty 18.07: 1...Rd1+ 2.Kf2 ± (0.91) Depth: 1/8 00:00:00 1...Rd3 ² (0.68) Depth: 1/8 00:00:00 1...Rd3 2.Kf2 ± (0.91) Depth: 2/8 00:00:00 1...Rd1+ 2.Kh2 Rd6 ± (0.81) Depth: 2/8 00:00:00 1...Kg6 2.Nxb6 axb6 3.Rxb6+ ± (0.74) Depth: 2/8 00:00:00 1...Kg6 2.Nxb6 axb6 3.Rxb6+ ± (0.74) Depth: 3/8 00:00:00 1...Rd6 2.Re7 Rd2 ± (0.73) Depth: 3/8 00:00:00 1...Rd6 2.Kf2 Rd2+ 3.Kf3 Rd3+ 4.Kg4 ± (0.98) Depth: 4/9 00:00:00 1...Kg6 2.Kh2 Kf6 3.Nxb6 axb6 4.Rxb6+ ± (0.79) Depth: 4/9 00:00:00 1...h5 2.Kh2 c3 3.bxc3 Rxa2 4.Nxb6 axb6 5.Rxb6 ² (0.69) Depth: 4/9 00:00:00 1...h5 2.Kh2 Rd6 3.Re7 Rd2 ² (0.51) Depth: 5/12 00:00:00 1...h5 2.a3 Rd1+ 3.Kf2 Rd2+ 4.Kf1 Rd1+ 5.Ke2 Rd6 ² (0.65) Depth: 6/13 00:00:00 26kN 1...Rxb2 = (0.25) Depth: 6/13 00:00:00 36kN 1...Rxb2 2.Nxb2 c3 3.Rxb6 axb6 4.Nd3 = (0.18) Depth: 6/13 00:00:00 39kN 1...Rxb2 2.Nxb2 c3 3.Nd3 c4+ 4.Rxb6 axb6 5.Ne5 ² (0.26) Depth: 7/14 00:00:00 45kN 1...Rxb2 2.Nxb2 c3 3.Nd3 c4+ 4.Rxb6 axb6 5.Ne5 = (-0.14) Depth: 8/15 00:00:00 85kN 1...Rxb2 2.Nxb2 c3 3.Nd3 c4+ 4.Rxb6 axb6 5.Nb4 Kg6 ³ (-0.35) Depth: 8/15 00:00:00 110kN 1...Rxb2 2.Nxb2 c3 3.Rxb6 axb6 4.Nd3 c4 5.Nb4 Kg6 ³ (-0.35) Depth: 9/19 00:00:01 170kN 1...Rxb2 2.Nxb2 c3 3.Rxb6 axb6 4.Nd3 c2 5.Kf2 Kg6 6.Nc1 c4 = (0.22) Depth: 10/20 00:00:01 262kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 = (0.00) Depth: 10/20 00:00:02 500kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.f5 Ra1+ 5.Kf2 Ra2+ 6.Kf3 Rc2 7.Rxb6 Rxc3+ 8.Kf4 = (0.04) Depth: 11/22 00:00:02 764kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.f5 Ra1+ 5.Kh2 Rf1 6.g4 Rf4 7.Rxb6 Rxg4 = (0.23) Depth: 12/23 00:00:04 1481kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.f5 Kg8 5.Rxb6 Ra3 6.Rb8+ Kh7 7.Rb7 Rxc3 8.Kf2 = (0.04) Depth: 13/25 00:00:09 3891kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.f5 Ra1+ 5.Kf2 Kg8 6.Rxb6 Ra3 7.c4 Rc3 8.Rb7 Rxc4 ² (0.30) Depth: 14/30 00:00:16 7144kN 1...c3 2.bxc3 Rxa2 3.Nxb6 axb6 4.f5 Ra1+ 5.Kh2 Rf1 6.g4 c4 7.Rc7 b5 8.Re7 Rc1 9.Re3 = (0.22) Depth: 15/34 00:00:54 24806kN (blass, tel-aviv 26.07.2002) Uri
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