Author: Brian Katz
Date: 07:41:33 01/13/04
Go up one level in this thread
On January 13, 2004 at 09:21:13, Robert Hyatt wrote: >On January 13, 2004 at 05:18:15, Jaime Benito de Valle Ruiz wrote: > >>In this position you can find several passed pawns for both sides (this is >>particularly hard for my engine), plus three connected passed pawns after the >>sacrifice 1. Rxe7, which is an obvious move to consider for human players. >>How much is worth 3 connected passed pawns in the 5th and 6th versus a rook >>here? >> >>[D]3k2r1/r3p2R/4P1b1/2PP1p2/p5p1/8/1B6/4R1K1 w - - 0 1 >> >>Does your engine find this move? >>(Mine doesn't. My passed-pawn goes mad giving extreme values for both sides >>during eval, making the search oscillate from one move to another all the time) >> >>Jaime > >It takes Crafty 11 seconds on my dual xeon 2.8 box: > > 13 7.89 -0.66 1. Be5 f4 2. Rh4 Bd3 3. Bxf4 Ra5 4. > Ra1 a3 5. c6 Be4 6. Be3 Ra6 7. Rd1 > 13 11.30 ++ 1. Rxe7!! > 13 17.02 -0.09 1. Rxe7 Kxe7 2. d6+ Kd8 3. c6 Be8 4. > Bf6+ Kc8 5. Rc1 Ra8 6. d7+ Kc7 7. Be5+ > Kb6 8. c7 Bxd7 9. exd7 Kb7 10. d8=B > 13-> 17.03 -0.09 1. Rxe7 Kxe7 2. d6+ Kd8 3. c6 Be8 4. > Bf6+ Kc8 5. Rc1 Ra8 6. d7+ Kc7 7. Be5+ > Kb6 8. c7 Bxd7 9. exd7 Kb7 10. d8=B > (s=2) > 14 19.87 ++ 1. Rxe7!! > 14 23.38 0.76 1. Rxe7 Kxe7 2. d6+ Kd8 3. c6 Be8 4. > Bf6+ Kc8 5. Rc1 Bxc6 6. Rxc6+ Kb8 7. > d7 a3 8. Rd6 Rc7 9. d8=Q+ Rxd8 10. > Bxd8 > 14-> 24.68 0.76 1. Rxe7 Kxe7 2. d6+ Kd8 3. c6 Be8 4. > Bf6+ Kc8 5. Rc1 Bxc6 6. Rxc6+ Kb8 7. > d7 a3 8. Rd6 Rc7 9. d8=Q+ Rxd8 10. > Bxd8 I also ran this position on my AMD Athlon XP 2600+ and found some interesting comparisons. Using Fritz Versions 8.0.0.8 and 8.0.0.23 and Crafty 19.08. Fritz 8008 took 2.5 minutes to find 1.Rxe7... and over 3 min. to evaluate as 1.03 in favor of white. Whereas, Fritz 8.0.0.23 took only 8 seconds to find 1.Rxe7... and 00:01:30 to rate the position as +-(1.47). Also, Crafty 19.08 took 00:00:18 to find 1.Rxe7... and 00:01:06 to evaluate it as (0.89) in favor of White. I ran this experiment over number of times. Also, closing out the Fritz8 program each time, to be sure that there were no evaluations remaining in the memory.....As, the first time I ran this when Switching 80023 and 8008 involving renaming the engine folders, 8008 found 1.Rxe7...much faster. So, when shutting down the program each time, the engines gave the following evaluations: New game 3k2r1/r3p2R/4P1b1/2PP1p2/p5p1/8/1B6/4R1K1 w - - 0 1 Analysis by Fritz 8: Engine Version 8.0.0.8 1.Rh4 a3 2.Be5 a2 3.Rc1 Ra3 4.Kf2 Rf3+ 5.Ke2 ³ (-0.53) Depth: 7/16 00:00:00 36kN 1.Rh4 a3 2.Be5 a2 3.Rc1 Ra3 4.Kf2 Rf3+ 5.Ke2 ³ (-0.53) Depth: 8/18 00:00:00 63kN 1.Rh4 a3 2.Be5 a2 3.Ra1 Ra4 4.Kf2 Ra3 5.Rh2 Rf3+ ³ (-0.50) Depth: 9/21 00:00:00 181kN 1.Rh4 Ra5 2.Rc1 a3 3.Be5 ³ (-0.50) Depth: 10/31 00:00:00 647kN 1.Rh4 a3 2.Be5 Ra5 3.Ra1 Be8 4.Kf2 a2 5.Bg3 Rxc5 6.Rxa2 Rxd5 ³ (-0.44) Depth: 11/25 00:00:02 1906kN 1.Rh4 Ra5 2.Rc1 a3 3.Be5 Rf8 4.Kf2 a2 5.Rh6 Be8 6.Rh4 Ra4 ³ (-0.31) Depth: 12/30 00:00:09 8200kN 1.Rh4 Ra5 2.Rc1 a3 3.Be5 Be8 4.Rh2 Bb5 5.Ra2 Ra4 6.Rc3 Re4 7.Bg3 ³ (-0.31) Depth: 13/34 00:00:17 15719kN 1.Rh2! ³ (-0.28) Depth: 13/34 00:00:27 24765kN 1.Rh2! = (-0.12) Depth: 13/34 00:00:33 29975kN 1.Be5! = (-0.09) Depth: 13/34 00:00:39 36581kN 1.Be5! = (0.06) Depth: 13/34 00:00:44 41016kN 1.Be5 f4 2.Rf7 f3 3.Rf4 Ra5 4.Rxg4 Rxc5 5.Ra1 f2+ 6.Kxf2 Rf8+ 7.Rf4 Rxf4+ ² (0.31) Depth: 14/35 00:01:15 69209kN 1.Be5! ² (0.59) Depth: 15/43 00:02:24 133375kN 1.Rxe7! ² (0.63) Depth: 15/57 00:02:59 168018kN 1.Rxe7! ± (0.78) Depth: 15/57 00:03:02 170697kN 1.Rxe7 Rxe7 2.Bf6 Rgg7 3.d6 Kc8 4.Bxe7 Rxe7 5.dxe7 Kc7 6.Kg2 Be8 7.Rf1 a3 8.Rxf5 Bc6+ ± (1.03) Depth: 15/57 00:03:11 178475kN Analysis by Fritz 8: Version 8.0.0.23 1.Rh4 a3 2.Be5 a2 3.Rc1 Ra3 4.Kg2 Be8 ³ (-0.59) Depth: 7/18 00:00:00 35kN 1.Rh4 a3 2.Be5 a2 3.Rc1 Ra3 4.Kg2 Be8 ³ (-0.59) Depth: 8/18 00:00:00 73kN 1.Rh4 a3 2.Be5 a2 3.Ra1 Ra5 4.Rh2 Rxc5 5.Rhxa2 Rxd5 ³ (-0.53) Depth: 9/22 00:00:00 216kN 1.Rh4 Ra5 2.Rc1 a3 3.Be5 ³ (-0.53) Depth: 10/24 00:00:01 897kN 1.Rh4 Ra5 2.Bd4 a3 3.Rb1 Ra8 4.Be5 a2 5.Ra1 ³ (-0.41) Depth: 11/27 00:00:02 2137kN 1.Rh4 Ra5 2.Rc1 a3 3.Be5 a2 4.Ra1 Ke8 5.Rh2 Rxc5 6.Rhxa2 Rxd5 7.Ra8+ ³ (-0.34) Depth: 12/26 00:00:06 5352kN 1.Rxe7! ³ (-0.31) Depth: 12/30 00:00:08 7612kN 1.Rxe7! = (-0.16) Depth: 12/30 00:00:08 7761kN 1.Rxe7! = (0.16) Depth: 12/31 00:00:09 8135kN 1.Rxe7 Rxe7 2.Bf6 f4 3.d6 Rgg7 4.c6 Rh7 5.Ra1 Be4 6.Bxe7+ Rxe7 7.dxe7+ Kxe7 8.Rxa4 Bxc6 ² (0.35) Depth: 12/31 00:00:09 8983kN 1.Rxe7! ² (0.66) Depth: 13/31 00:00:12 10896kN 1.Rxe7 Rxe7 2.Bf6 f4 3.d6 Rge8 4.Ra1 Bc2 5.c6 Bb3 6.Kf2 Bd5 ² (0.70) Depth: 13/31 00:00:13 11980kN 1.Rxe7 Rxe7 2.Bf6 f4 3.d6 Rge8 4.Ra1 Bc2 5.c6 Bb3 6.Kf2 Bd5 ² (0.70) Depth: 14/36 00:00:20 19710kN 1.Rxe7! ± (1.00) Depth: 15/42 00:00:40 39164kN 1.Rxe7 Rxe7 2.Bf6 f4 3.d6 Rge8 4.c6 g3 5.Rc1 Bf5 6.Rc5 Bxe6 7.Ra5 f3 8.Ra8+ Bc8 ± (1.19) Depth: 15/42 00:00:45 44181kN 1.Rxe7! +- (1.47) Depth: 16/45 00:01:30 90465kN Analysis by Crafty 19.08: 1.Rg7 Rxg7 2.Bxg7 -+ (-2.42) Depth: 1/5 00:00:00 1.Rg7 Rxg7 2.Bxg7 -+ (-2.42) Depth: 2/5 00:00:00 1.Rg7 Rxg7 2.Bxg7 a3 -+ (-3.19) Depth: 3/5 00:00:00 1.Rh6 a3 2.Be5 -+ (-2.96) Depth: 3/5 00:00:00 1.Rh6 f4 2.c6 a3 -+ (-3.12) Depth: 4/8 00:00:00 1.Rg7 -+ (-2.56) Depth: 4/8 00:00:00 1.Rg7 Rxg7 2.Bxg7 a3 3.c6 -+ (-2.46) Depth: 4/8 00:00:00 1.Rg7 Rxg7 2.Bxg7 f4 3.c6 a3 -+ (-3.09) Depth: 5/10 00:00:00 1.Rh6 f4 2.Be5 f3 3.c6 -+ (-2.74) Depth: 5/10 00:00:00 1.Rh6 a3 2.Be5 Ra4 3.c6 f4 -+ (-2.92) Depth: 6/12 00:00:00 19kN 1.Rg7 Rxg7 2.Bxg7 a3 3.c6 a2 4.Ra1 g3 -+ (-2.83) Depth: 6/12 00:00:00 23kN 1.Rg7 Rxg7 2.Bxg7 a3 3.Rb1 Ra8 4.c6 g3 -+ (-2.98) Depth: 7/16 00:00:00 46kN 1.Rh6 a3 2.Be5 Ra5 3.Rc1 a2 4.Ra1 Rxc5 5.Rxa2 Rxd5 -+ (-2.86) Depth: 7/16 00:00:00 60kN 1.Rh4 a3 2.Be5 Ra5 3.Rc1 a2 4.Kf2 Rf8 -+ (-2.73) Depth: 7/16 00:00:00 86kN 1.Rh4 a3 2.Be5 Ra5 3.Rc1 a2 4.Kf2 Rf8 5.Ba1 -+ (-2.43) Depth: 8/17 00:00:00 145kN 1.Rh4 a3 2.Be5 a2 3.Kf2 Ra5 4.Rc1 -+ (-2.49) Depth: 9/20 00:00:00 335kN 1.Be5 -+ (-2.03) Depth: 9/20 00:00:01 554kN 1.Be5 -+ (-1.64) Depth: 10/23 00:00:01 963kN 1.Be5 f4 2.Rh4 Bd3 3.Bxf4 Ra5 4.Rc1 a3 5.Kf2 a2 6.Be5 µ (-1.00) Depth: 10/23 00:00:04 3996kN 1.Be5 f4 2.Rh4 Bc2 3.Bxf4 Ra5 4.Re5 a3 5.Rg5 Rf8 6.Be3 µ (-0.92) Depth: 11/32 00:00:05 4980kN 1.Be5 f4 2.Rh4 Bc2 3.Bxf4 Ra5 4.c6 Rxd5 5.Rc1 Bf5 6.c7+ Kc8 7.Rc6 µ (-1.03) Depth: 12/32 00:00:07 7016kN 1.Be5 f4 2.Rh4 Bd3 3.Bxf4 Ra5 4.Ra1 Bc4 5.Bd2 Ra8 6.Rh5 a3 7.c6 ³ (-0.66) Depth: 13/32 00:00:14 15034kN 1.Rxe7 ³ (-0.63) Depth: 13/32 00:00:18 19446kN 1.Rxe7 Rxe7 2.Bf6 Ke8 3.Bxe7 Kxe7 4.d6+ Kd8 5.c6 Be8 6.Rb1 Kc8 7.Rc1 a3 = (-0.10) Depth: 13/32 00:00:22 23131kN 1.Rxe7 Rxe7 2.Bf6 Ke8 3.Bxe7 Kxe7 4.d6+ Kd8 5.c6 Be8 6.Rb1 Kc8 7.Rc1 a3 ² (0.30) Depth: 14/34 00:00:27 28018kN 1.Rxe7 Kxe7 2.d6+ Kd8 3.c6 Re8 4.Bd4 Ra6 5.Rc1 Rxc6 6.Bf6+ Kc8 7.Rxc6+ Kb7 8.Rc1 Rxe6 9.d7 Rxf6 10.d8Q ± (0.95) Depth: 14/34 00:00:43 44629kN 1.Rxe7 Kxe7 2.d6+ Kd8 3.c6 Be8 4.Bf6+ Kc8 5.Rc1 Rc7 6.d7+ Bxd7 7.cxd7+ Kb7 8.Rd1 a3 9.e7 Rxd7 10.Rxd7+ Kc6 11.Ra7 ± (0.89) Depth: 15/36 00:01:06 67718kN (Katz, Eatontown 13.01.2004)
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