Author: Brian Katz
Date: 07:44:18 01/13/04
Go up one level in this thread
On January 13, 2004 at 10:41:33, Brian Katz wrote: >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) Brian
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