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Subject: Re: MCP8 ANALYSIS OF CAPABLANCA'S SACRIFICE

Author: Laurence Chen

Date: 09:31:46 12/15/98

Go up one level in this thread


On December 15, 1998 at 09:06:23, Thom Perry wrote:

>MCP8 will not play 12. Bxh7+ because initially the program believes that black
>is about a point ahead after the bishop sacrifice.  Following is the analysis
>which I ran twice to see whether MCP8 would deviate the second time around with
>the learning enabled:
>
>
>M-Chess Pro 8.0, P200-S, 96MEG EDO, Tyan Tomcat motherboard
>3min./move, learning enabled
>
>     White  Black  Depth  Score  Analysis
>     ------------------------------------
>
>  12. ....   Kxh7    8) - 0.53   Kg8xh7  Nf3-g5+ Kh7-g6  Qd1-g4  f7-f5
>                                 Qg4-g3  f5-f4   Qg3-g4  e6-e5   Ng5-e6+
>                                 Kg6-f6
>      1:57:00     1:58:21
>  13. Ng5+           7) - 0.52   Nf3-g5+ Kh7-g6  Qd1-g4  f7-f5   Qg4-g3
>                                 f5-f4   Qg3-g4  e6-e5   Ng5-e6+ Kg6-f6
>  13. ....   Kg6     8) - 0.69   Kh7-g6  Qd1-g4  f7-f5   Qg4-g3  f5-f4
>                                 e3xf4   Ne7-f5  Qg3-g4
>      1:55:44     1:54:57
>  14. Qg4            7) - 0.35   Qd1-g4  f7-f5   Qg4-g3  f5-f4   e3xf4
>                                 Ne7-f5  Qg3-g4
>  14. ....   f5      8) - 0.00   f7-f5   Qg4-g3  f5-f4   e3xf4   Ne7-f5
>                                 Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>      1:52:03     1:51:50
>  15. Qg3            8) - 0.00   Qg4-g3  f5-f4   e3xf4   Ne7-f5  Qg3-g4
>                                 Nf5-h6  Qg4-g3  Nh6-f5
>  15. ....   f4      7) - 0.00   f5-f4   e3xf4   Ne7-f5  Qg3-g4  Nf5-h6
>                                 Qg4-g3  Nh6-f5
>      1:48:49     1:49:44
>  16. exf4           7) - 0.00   e3xf4   Ne7-f5  Qg3-g4  Nf5-h6  Qg4-g3
>                                 Nh6-f5
>  16. ....   Nf5     7) - 0.00   Ne7-f5  Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>      1:46:36     1:46:48
>  17. Qg4            8) - 0.00   Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>  17. ....   Nh6     7) - 0.00   Nf5-h6  Qg4-g3  Nh6-f5
>      1:43:21     1:39:26
>  18. Qg3            8) + 0.00   Qg4-g3  Nh6-f5
>  18. ....   Nf5     8) - 0.00   Nh6-f5  Qg3-g4
>      1:41:02     1:37:06
>  19. Qg4            9) + 0.00   Qg3-g4  Nf5-h6
>  19. ....   Nh6     9) - 0.00   Nf5-h6  Qg4-g3
>      1:37:25     1:34:00
>  20. Qg3            9) + 0.00   Qg4-g3  Nh6-f5
>  20. ....   Nf5     9) + 0.00   Nh6-f5
>      1:33:02     1:31:00
>
>  Game was drawn by 3rd repetition!  Let's try again to see whether MCP8
>  has learned anything from the first iteration.
>
>     White  Black  Depth  Score  Analysis
>     ------------------------------------
>
>  12. ....   Kxh7    8) - 0.53   Kg8xh7  Nf3-g5+ Kh7-g6  Qd1-g4  f7-f5
>                                 Qg4-g3  f5-f4   Qg3-g4  e6-e5   Ng5-e6+
>                                 Kg6-f6
>      2:00:00     1:58:21
>  13. Ng5+           7) - 0.52   Nf3-g5+ Kh7-g6  Qd1-g4  f7-f5   Qg4-g3
>                                 f5-f4   Qg3-g4  e6-e5   Ng5-e6+ Kg6-f6
>  13. ....   Kg6     8) - 0.69   Kh7-g6  Qd1-g4  f7-f5   Qg4-g3  f5-f4
>                                 e3xf4   Ne7-f5  Qg3-g4
>      1:58:44     1:55:14
>  14. Qg4            7) - 0.35   Qd1-g4  f7-f5   Qg4-g3  f5-f4   e3xf4
>                                 Ne7-f5  Qg3-g4
>  14. ....   f5      8) - 0.00   f7-f5   Qg4-g3  f5-f4   e3xf4   Ne7-f5
>                                 Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>      1:55:03     1:52:07
>  15. Qg3            8) - 0.00   Qg4-g3  f5-f4   e3xf4   Ne7-f5  Qg3-g4
>                                 Nf5-h6  Qg4-g3  Nh6-f5
>  15. ....   f4      7) - 0.00   f5-f4   e3xf4   Ne7-f5  Qg3-g4  Nf5-h6
>                                 Qg4-g3  Nh6-f5
>      1:51:48     1:50:00
>  16. exf4           7) - 0.00   e3xf4   Ne7-f5  Qg3-g4  Nf5-h6  Qg4-g3
>                                 Nh6-f5
>  16. ....   Nf5     7) - 0.00   Ne7-f5  Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>      1:49:36     1:47:05
>  17. Qg4            8) - 0.00   Qg3-g4  Nf5-h6  Qg4-g3  Nh6-f5
>  17. ....   Nh6     7) - 0.00   Nf5-h6  Qg4-g3  Nh6-f5
>      1:46:21     1:39:44
>  18. Qg3            8) + 0.00   Qg4-g3  Nh6-f5
>  18. ....   Nf5     8) - 0.00   Nh6-f5  Qg3-g4
>      1:44:02     1:37:25
>  19. Qg4            9) + 0.00   Qg3-g4  Nf5-h6
>  19. ....   Nh6     9) - 0.00   Nf5-h6  Qg4-g3
>      1:40:25     1:34:19
>  20. Qg3            9) + 0.00   Qg4-g3  Nh6-f5
>  20. ....   Nf5     9) + 0.00   Nh6-f5
>      1:36:02     1:31:18
>
>Same result.
Thanks Thom Perry for the analysis, it is the same with Junior 5. Well it is
Black who forces a draw by repitition. After 17. Qg4, every other Black move
gives White the advantage with exception of 17. ... Nh6.
r1bq1r2/pp4p1/4p1k1/2n2nN1/5PQ1/2N5/PP3PPP/R4RK1 b - - 0 17

Analysis by Junior 5.0:

= (0.00): 17...Nh6 18.Qg3
+- (1.72): 17...Kf6 18.Rad1 Qb6 19.Nh7+ Kf7 20.Nxf8 Kxf8 21.Qg6
+- (1.83): 17...Kh6 18.b4 Qd3 19.Rac1 Nd7 20.Nxe6 Rf7 21.Rfd1 Qc4 22.Ng5 Rf8
23.Rd5
+- (2.41): 17...Qe7 18.Nxe6+ Kh7 19.Nxf8+ Qxf8 20.Rae1 Nh6 21.Qg3 Ne6 22.Re4 Qc5
+- (2.96): 17...Nd4 18.Nxe6+ Kf6 19.Qxg7+ Kxe6 20.Rfe1+ Kd6 21.Rad1 Qf6 22.Rxd4+
Kc6 23.Qxf6+ Rxf6 24.Re7 Bf5
+- (3.38): 17...Qe8 18.Nxe6+ Kh7 19.Nxc5 Qg6 20.h3 Qxg4 21.hxg4 Nh4 22.f5 Re8






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