Author: Uri Blass
Date: 09:40:42 02/24/01
Go up one level in this thread
On February 24, 2001 at 10:18:42, Enrique Irazoqui wrote: >On February 24, 2001 at 07:08:47, Howard Exner wrote: > >>[D]1q1r3k/3P1pp1/ppBR1n1p/2p1Q2P/P4P2/8/5PK1/8 w >> >>This is the winning sequence. >>1. Rxf6 Qxe5 2. fxe5 gxf6 3. exf6 >> >>Can today's programs on fast hardware find this? > >On a dual P933 with 512MB hash, Deep Fritz and Deep Shredder beta don't pick >Rxf6 in less than 20 minutes. Crafty 18.03 for CB does in 12 minutes. Now I'm >trying with Junior 7 beta and if it sees it I will post the analysis. Nice >position, Howard. > >Enrique > >New position >1q1r3k/3P1pp1/ppBR1n1p/2p1Q2P/P4P2/8/5PK1/8 w - - 0 1 > >Analysis by Crafty 18.03: > >1.Rxf6 Qxe5 2.fxe5 gxf6 3.exf6 > µ (-1.23) Depth: 1/2 00:00:03 >1.Kg1 > µ (-0.83) Depth: 1/2 00:00:03 >1.Kg1 > ³ (-0.54) Depth: 1/2 00:00:03 >1.Kg1 Nxh5 > -+ (-1.60) Depth: 2/6 00:00:03 >1.Rxf6 Qxe5 2.fxe5 gxf6 3.exf6 > µ (-1.23) Depth: 2/6 00:00:03 >1.Rd3 Qxe5 2.fxe5 Nxh5 > µ (-1.14) Depth: 2/6 00:00:03 >1.a5 Ng4 > µ (-0.85) Depth: 2/6 00:00:03 >1.a5 Ng4 2.Qe8+ Kh7 > µ (-0.92) Depth: 3/6 00:00:03 >1.a5 bxa5 2.Qxc5 Nxh5 > -+ (-1.42) Depth: 4/11 00:00:03 >1.Kf1 Qc7 2.Rxf6 Qxe5 3.fxe5 gxf6 4.exf6 > µ (-1.34) Depth: 4/11 00:00:03 >1.Rd3 Qxe5 2.fxe5 Nxh5 > µ (-1.14) Depth: 4/11 00:00:03 >1.Rxf6 Qxe5 2.Rxh6+ Kg8 3.fxe5 gxh6 > µ (-0.77) Depth: 4/11 00:00:03 >1.Rxf6 Qxe5 2.Rxh6+ gxh6 3.fxe5 c4 > µ (-0.99) Depth: 5/14 00:00:03 >1.Qe7 c4 2.Rd4 Nxh5 3.Qe8+ Kh7 4.Qxf7 > µ (-0.75) Depth: 5/14 00:00:03 >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 > µ (-0.90) Depth: 6/14 00:00:03 71kN >1.Rxf6 Qxe5 2.Rxh6+ gxh6 3.fxe5 c4 4.Kf3 > µ (-0.82) Depth: 6/14 00:00:03 79kN >1.Rxf6 Qxe5 2.fxe5 gxf6 3.exf6 c4 4.Kf3 > µ (-1.36) Depth: 7/14 00:00:03 91kN >1.Qe7 > µ (-0.96) Depth: 7/14 00:00:03 107kN >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 4.f5 > µ (-0.71) Depth: 7/14 00:00:03 154kN >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 4.Bd5 a5 > µ (-0.98) Depth: 8/14 00:00:03 204kN >1.Kg1 Qc7 2.Re6 Qxe5 3.Rxe5 Kh7 4.Re7 c4 > µ (-0.95) Depth: 8/14 00:00:03 429kN >1.Kg1 Qc7 2.Re6 Qxe5 3.Rxe5 Kh7 4.Re7 c4 5.Kg2 Nxh5 6.Rxf7 > µ (-0.96) Depth: 9/16 00:00:04 576kN >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 4.Bd5 b5 5.Rxa6 bxa4 > µ (-0.86) Depth: 9/16 00:00:04 821kN >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 4.Bd5 b5 5.Rxa6 bxa4 > µ (-0.86) Depth: 10/18 00:00:05 1915kN >1.Rd3 Qa7 2.Rd6 Qc7 3.Re6 Qxe5 4.Rxe5 Kh7 5.Re7 c4 > µ (-0.78) Depth: 10/18 00:00:06 3097kN >1.Rd1 Qa7 2.Re1 c4 3.Qd6 Rxd7 4.Bxd7 Qxd7 5.Qf8+ Kh7 6.Re7 > ³ (-0.66) Depth: 10/18 00:00:07 3941kN >1.Rd1 Qa7 2.Re1 Rxd7 3.Bxd7 Qxd7 4.Qb8+ Kh7 5.Qxb6 Nxh5 6.Qb1+ f5 7.Kf3 > ³ (-0.62) Depth: 11/20 00:00:09 5853kN >1.Rd1 Qa7 2.Re1 Rxd7 3.Bxd7 Qxd7 4.Qb8+ Kh7 5.Qxb6 Nxh5 6.Qxa6 Qg4+ 7.Kf1 Nxf4 > µ (-0.73) Depth: 12/20 00:00:13 10365kN >1.Qe7 Ng8 2.Qe5 a5 3.Rd3 Qa7 4.Re3 Nf6 5.Qe7 Rxd7 6.Bxd7 Qxd7 > ³ (-0.59) Depth: 12/20 00:00:20 17432kN >1.Qe7 Ng8 2.Qe5 a5 3.Rd3 Qa7 4.Re3 Rxd7 5.Bxd7 Qxd7 6.Qb8 Qg4+ 7.Kf1 c4 8.Qxb6 >Qxh5 > ³ (-0.58) Depth: 13/20 00:00:23 20655kN >1.Rd1 Qa7 2.Re1 Rxd7 3.Bxd7 Qxd7 4.Qb8+ Kh7 5.Qxb6 Qg4+ 6.Kf1 Qh3+ 7.Kg1 Nxh5 >8.Re7 Qf5 9.Qxa6 Nxf4 > ³ (-0.56) Depth: 13/20 00:00:30 29016kN >1.Rd1 Qa7 2.Re1 Rxd7 3.Bxd7 Qxd7 4.Qb8+ Kh7 5.Qxb6 Qg4+ 6.Kf1 Qh3+ 7.Kg1 Qxh5 > ³ (-0.54) Depth: 14/22 00:00:52 52866kN >1.Qe7 Ng8 2.Qe5 f6 3.Qe6 Qc7 4.Be4 c4 5.Bf5 b5 6.Rxa6 bxa4 7.Rxa4 c3 > ³ (-0.28) Depth: 14/22 00:01:28 91979kN >1.Qe7 Ng8 2.Qe5 c4 3.Rd4 c3 4.Rd3 c2 5.Qxb8 Rxb8 6.Rc3 Nf6 7.Rxc2 Rd8 8.a5 bxa5 > = (-0.08) Depth: 15/24 00:02:05 131403kN >1.Qe7 Ng8 2.Qe5 Nf6 > = (0.00) Depth: 16/24 00:03:11 203085kN >1.Qe7 Ng8 2.Qe5 Nf6 > = (0.00) Depth: 17/24 00:04:18 277777kN >1.Qe7 Ng8 2.Qe5 Nf6 > = (0.00) Depth: 18/24 00:08:06 529114kN >1.Rxf6 Qxe5 2.fxe5 gxf6 3.exf6 c4 4.Kf3 Kh7 5.Ke4 Kg8 6.Kd4 c3 7.Kxc3 Kh8 8.Kd4 >Kh7 9.Be4+ Kg8 10.Bf5 > ² (0.31) Depth: 18/24 00:12:31 827881kN >1.Rxf6 Qxe5 2.fxe5 gxf6 3.exf6 c4 4.Kf3 Kh7 5.Ke4 Kg8 6.Kd4 c3 7.Kxc3 Kh8 8.Kd4 >Kg8 9.Kd5 > ² (0.38) Depth: 19/24 00:13:20 884211kN > >(Irazoqui, Cadaqués 24.02.2001) I see that crafty solved it for positional reasons. The main line shows a position when black has material advantage and crafty's evaluation is positive for white. It is also intereting to know if 18.01 is faster because I know that one of the changes in crafty that was after 18.01 is to avoid the recapture extensions and it means not doing a special extensions for captures at the same square like Qxe5 fxe5. Uri
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