Author: Dann Corbit
Date: 10:46:37 02/06/01
Go up one level in this thread
On February 05, 2001 at 22:40:58, Howard Exner wrote:
>On February 05, 2001 at 19:02:26, Arturo Ochoa wrote:
>
>>[D]r1b5/p2k1r1p/3P2pP/1ppR4/2P2p2/2P5/P1B4P/4R1K1 w - -
>>
>>
>>Main Line: 1. Bxg6!! hxg6 2. Re7+ Rxe7 3. dxe7+ Kxe7 4. Rd8! Kxd8 5. h7 1-0
>>
>>Neither the Programs that I have tested (Fritz, Rebel, Hiarcs, Junior, Gromit,
>>LambChop, Diep2) can solve the position. They can only "see" the weak move 1.
>>cxb5?
>>
>>Tell me if I am wrong.
>>
>>Regards, Arturo.
>
>A while back, maybe a year ago, Dann Corbit and I discussed this position.
>He did give a line where cxb5 also wins. I liked the Bxg6 solution more, but a
>wins a win I guess.
>
>Rebel used to get Bxg6 for this one, but have not checked Century 3 on it.
>How long did you give the programs to test this?
I like to revisit these things from time to time as hardware improves. Here is
the current crafty log for that position:
choose from book moves randomly (using weights.)
choose from 5 best moves.
book learning enabled
result learning enabled
position learning enabled
threshold set to 9 pawns.
4 piece tablebase files found
1302kb of RAM used for TB indices and decompression tables
Crafty v17.14
White(1): st 20000
search time set to 20000.00.
White(1): epdpfga yg.epd yg.out
PFGA: EPD record: 1
end-game phase
clearing hash tables
time surplus 0.00 time limit 333:20 (333:20)
nss depth time score variation (1)
7 0.26 ++ 1. cxb5!!
7-> 0.35 1.32 1. cxb5 Rb8 2. Rd2 f3 3. Bb3 Rf4
8 0.61 1.55 1. cxb5 Bb7 2. Rd2 c4 3. Kf2 Rd8 4.
h4 Rf6
8-> 0.69 1.55 1. cxb5 Bb7 2. Rd2 c4 3. Kf2 Rd8 4.
h4 Rf6
9 0.85 1.64 1. cxb5 Bb7 2. Rd2 c4 3. Kf2 Rd8 4.
h4 f3 5. Rd4
9-> 1.00 1.64 1. cxb5 Bb7 2. Rd2 c4 3. Kf2 Rd8 4.
h4 f3 5. Rd4
10 1.75 1.70 1. cxb5 Bb7 2. Rd2 f3 3. Bb3 f2+ 4.
Rxf2 Rxf2 5. Re7+ Kxd6 6. Re6+ Kd7
7. Kxf2
10-> 3.64 1.70 1. cxb5 Bb7 2. Rd2 f3 3. Bb3 f2+ 4.
Rxf2 Rxf2 5. Re7+ Kxd6 6. Re6+ Kd7
7. Kxf2
11 6.18 1.94 1. cxb5 Bb7 2. Rd2 c4 3. Ba4 Rg8 4.
h4 Rd8 5. b6+ Bc6 6. Bxc6+ Kxc6 7.
Re7 Rxe7 8. dxe7
11-> 7.00 1.94 1. cxb5 Bb7 2. Rd2 c4 3. Ba4 Rg8 4.
h4 Rd8 5. b6+ Bc6 6. Bxc6+ Kxc6 7.
Re7 Rxe7 8. dxe7
12 9.99 2.07 1. cxb5 Bb7 2. Rd2 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf6 6. Ba4 Rf4 7.
Bb3
12-> 19.48 2.07 1. cxb5 Bb7 2. Rd2 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf6 6. Ba4 Rf4 7.
Bb3
13 24.96 2.02 1. cxb5 Bb7 2. Rd2 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf6 6. Ba4 Rf4 7.
d7+ Kd8 8. Bb3
13-> 36.34 2.02 1. cxb5 Bb7 2. Rd2 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf6 6. Ba4 Rf4 7.
d7+ Kd8 8. Bb3
14 1:06 2.12 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf4 6. Re1+ Re4 7.
Rxe4+ Bxe4 8. Be6 g5 9. h3
14-> 1:54 2.12 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf4 6. Re1+ Re4 7.
Rxe4+ Bxe4 8. Be6 g5 9. h3
15 2:57 2.22 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf4 6. Re1+ Re4 7.
Rxe4+ Bxe4 8. Be6 g5 9. d7+ Kd8 10.
h3
15-> 4:45 2.22 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Re8 4.
Rxe8 Kxe8 5. Bb3 Rf4 6. Re1+ Re4 7.
Rxe4+ Bxe4 8. Be6 g5 9. d7+ Kd8 10.
h3
16 8:33 ++ 1. cxb5!!
16 17:49 2.88 1. cxb5 Bb7 2. Rdd1 Rd8 3. Bb3 Rf6
4. Re7+ Kc8 5. Rxh7 Bf3 6. Re1 Rfxd6
7. Rxa7 Bb7 8. h7 Rd2 9. Re7 Rg2+ 10.
Kf1
16-> 19:34 2.88 1. cxb5 Bb7 2. Rdd1 Rd8 3. Bb3 Rf6
4. Re7+ Kc8 5. Rxh7 Bf3 6. Re1 Rfxd6
7. Rxa7 Bb7 8. h7 Rd2 9. Re7 Rg2+ 10.
Kf1
17 31:34 3.02 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bxh7 Kc8 6. Be4 Bxe4 7.
Rxe4 Rxh6 8. Re7 Rxh2+ 9. Kxf3 Rd7
10. Re8+ Kb7
17-> 34:37 3.02 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bxh7 Kc8 6. Be4 Bxe4 7.
Rxe4 Rxh6 8. Re7 Rxh2+ 9. Kxf3 Rd7
10. Re8+ Kb7
18 54:53 3.06 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bh5 Rxd6 6. Rxd6+ Kxd6
7. Rd1+ Kc7 8. Rxd8 Kxd8 9. Bxf3 Bc8
10. Ke3 Bf5 11. Bc6
18-> 65:56 3.06 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bh5 Rxd6 6. Rxd6+ Kxd6
7. Rd1+ Kc7 8. Rxd8 Kxd8 9. Bxf3 Bc8
10. Ke3 Bf5 11. Bc6
19 135:18 3.29 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bxh7 Kc8 6. h3 Rfxd6 7.
Rxd6 Rxd6 8. Bf5+ Kc7 9. h7 Rd2+ 10.
Kg3 Rd8 11. Re7+ Kb6 12. Kf2
19-> 157:14 3.29 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bxh7 Kc8 6. h3 Rfxd6 7.
Rxd6 Rxd6 8. Bf5+ Kc7 9. h7 Rd2+ 10.
Kg3 Rd8 11. Re7+ Kb6 12. Kf2
20 297:22 3.44 1. cxb5 Bb7 2. Rdd1 f3 3. Kf2 Rd8 4.
Bxg6 Rf6 5. Bxh7 Kc8 6. h3 Rfxd6 7.
Bf5+ Kc7 8. Re7+ Kb6 9. Rxd6+ Rxd6
10. h7 Rd2+ 11. Kg3 Rd8 12. Bg4 Rf8
13. Kf2
time=333:20 cpu=99% mat=0 n=3689025738 fh=4% nps=184448
ext-> checks=570259680 recaps=35419144 pawns=105078740
1rep=31395884 thrt:3087215
predicted=0 nodes=3689025738 evals=3523091953
endgame tablebase-> probes done=0 successful=0
White(1):
White(1): quit
execution complete.
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