Author: Uri Blass
Date: 02:28:46 01/23/03
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On January 23, 2003 at 05:12:32, Uri Blass wrote: >I gave the following position from the GCP test suite to Fritz8 and I asked it >to analyze 2 options > >My conclusion is that Fritz8 beleives that it is a positional problem and the >difference between the first move and the second move is only 0.25 pawns even >after many minutes. > >[D]2k4r/1pp2ppp/p1p1bn2/4N3/1q1rP3/2N1Q3/PPP2PPP/R4RK1 w - - 0 1 > >Analysis by Fritz 8: > >1. ² (0.59): 1.Nd5 cxd5 2.c3 Qxb2 3.Qxd4 Qb6 4.Qxb6 cxb6 5.exd5 Nxd5 6.Rfe1 b5 >2. ² (0.34): 1.Rad1 Rxd1 2.Rxd1 Qb6 3.Qxb6 cxb6 4.f4 Nd7 5.Nxd7 Bxd7 6.Kf2 Rd8 >7.f5 f6 > >(Blass, Tel-Aviv 23.01.2003) > > >Note that latest Movei prefers Nd3 and the reason is not being unable to see the >tactics of Nd5 > >Nd5 win a rook for a kinght and a pawn but white has 2 weak pawns(a2 and c3) > >I gave Fritz8 the main line that seemed to be forced from white point of view >for tactical or positional reasons >1.Nd5 cxd5 2.c3 Qxb2 3.Qxd4 Qb6 4.Qxb6 cxb6 5.exd5 Nxd5 > >I asked it to analyze the position after 5...Nxd5 to see if Fritz can see more >than 0.59 for white. > >Here is the result. > >Fritz8 cannot see improvement for white and the question is if white can win >with Nd5(I am not sure about it). > >[D]2k4r/1p3ppp/pp2b3/3nN3/8/2P5/P4PPP/R4RK1 w - - 0 1 > >Analysis by Fritz 8: > >6.Rfe1 b5 7.Rac1 f6 8.Nd3 Re8 9.Nc5 > ² (0.59) Depth: 7/18 00:00:00 89kN >6.Rfe1 b5 7.Rac1 Nc7 8.a3 f6 9.Nf3 Re8 > ² (0.53) Depth: 8/20 00:00:00 198kN >6.Rfe1 Rd8 7.Rad1 b5 8.a3 f6 9.c4 Nc3 10.Rxd8+ Kxd8 > ² (0.50) Depth: 9/21 00:00:01 698kN >6.Rfe1 Rd8 7.a3 b5 8.Rac1 Nf4 9.g3 Nd3 > ² (0.59) Depth: 10/22 00:00:04 1673kN >6.Rfe1 b5 7.Rac1 Nb6 8.a3 Re8 9.Rcd1 f6 10.Nf3 Nc4 11.Nd4 > ² (0.56) Depth: 11/26 00:00:09 3668kN >6.Rfe1 b5 7.Rac1 Nb6 8.a3 Rd8 9.Rcd1 Rxd1 10.Rxd1 Nd5 11.Rc1 f6 12.c4 > ² (0.56) Depth: 12/27 00:00:18 7538kN >6.Rfe1 b5 7.Rac1 Nb6 8.a3 Rd8 9.Rcd1 Na4 10.Rxd8+ Kxd8 11.Rd1+ Ke7 12.Rd3 f6 >13.Nf3 > ² (0.53) Depth: 13/30 00:00:43 18646kN >6.a4! > ² (0.56) Depth: 13/30 00:01:22 36194kN >6.f4! > ² (0.59) Depth: 13/30 00:01:48 47618kN >6.f4 f6 7.f5 Bg8 8.Nd3 b5 9.Rfe1 Kd8 10.Re4 Ne7 11.g4 Bd5 > ² (0.66) Depth: 13/30 00:01:57 51549kN >6.f4 f6 7.Nd3 Re8 8.Rfe1 Kd8 9.Rac1 b5 10.g3 Nc7 11.Nc5 Bxa2 > ² (0.56) Depth: 14/32 00:02:47 73376kN >6.f4 f6 7.Nd3 Ne3 8.Rf3 Nc4 9.Re1 Bf5 10.Nc1 Kd7 11.Nb3 Re8 > ² (0.50) Depth: 15/35 00:06:22 168526kN >6.a4! > ² (0.53) Depth: 15/35 00:07:22 194998kN >6.a4 f6 7.Nd3 Bf5 8.Rfd1 Re8 9.g3 Nc7 10.Nb4 Be6 11.Rd2 Bc4 12.Rb1 > ² (0.59) Depth: 15/35 00:09:55 262644kN > >(Blass, Tel-Aviv 23.01.2003) > >Uri It is possible that Fritz8 finally finds the key for progress at depth 16 but the position is usually solved by programs for positional reasons and not for tactical reasons and the question if rook is good enough to win bishop and pawn when the side with the rook has 2 isolated pawns is a positional question 6.a4 Kb8 7.c4 Nf4 8.Rfe1 Rc8 9.Re4 f6 10.Nd7+ Bxd7 11.Rxf4 ² (0.53) Depth: 16/37 00:16:46 445747kN 6.f4! ² (0.56) Depth: 16/38 00:20:25 545115kN 6.f4 f6 7.f5 fxe5 8.fxe6 Re8 9.Rf7 Rxe6 10.Rxg7 h6 11.Rf1 Kb8 ² (0.66) Depth: 16/38 00:22:27 597159kN (Blass, Tel-Aviv 23.01.2003) Uri
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