Author: Robert Hyatt
Date: 06:21:13 01/13/04
Go up one level in this thread
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
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