Author: Dann Corbit
Date: 12:20:32 04/27/99
Go up one level in this thread
On April 27, 1999 at 12:28:41, Peter Kappler wrote:
>
>I noticed Will didn't post a position this week, so I'll share one from a game
>Grok played as Black against Lambchop a couple of weeks ago on ICC.
>
>r3r2k/p1bb1pp1/qp5p/3pP3/PBp2P1Q/4P1RP/2B3P1/R5K1 w - - bm Rxg7;
>
>How long does it take your program to:
>a) find Rxg7
>b) realize Rxg7 is winning
>
>This is probably easy for programs with the single-reply extension.
>
>Lambchop found this in a blitz game - I think Peter McKenzie reported that it
>needed 6 seconds to see the move on his P133, and somewhere around 30-40 seconds
>to see the win. (Correct me if I'm remembering this wrong, Peter)
>
>--Peter
>
>
>P.S. Chess Genius 6 on my K6-300 finds Rxg7 instantly, and after a short time
>announces mate in 8.
Crafty chooses Rxg7 at 1 second, switches to Be7 at 2.6 seconds, then back to
Rxg7 at 39 seconds. It announces mate in 9 at 7:36. Keep in mind that my
machine is running a large number of tasks, and Crafty would probably find it
much faster on an 'unencumbered' PII 300 MHz.
middle-game phase
clearing hash tables
time surplus 0.00 time limit 12:50 (12:50)
depth time score variation (1)
White(1): exit
5 0.27 -0.80 1. Bc3 Bd8 2. Qh5 Re7 3. Rg5
5-> 0.29 -0.80 1. Bc3 Bd8 2. Qh5 Re7 3. Rg5
6 0.54 -0.71 1. Bc3 Re6 2. f5 Rxe5 3. Bxe5 Bxe5
6 0.78 -0.69 1. Qh5 Be6 2. Bd6 Qc8 3. f5 Bxd6 4.
exd6
6 0.99 ++ 1. Rxg7!!
6 1.09 0.00 1. Rxg7 Kxg7 2. Qf6+ Kg8 3. Bh7+ Kxh7
4. Qxf7+ Kh8 5. Qf6+ Kh7 6. Qf7+
6-> 1.34 0.00 1. Rxg7 Kxg7 2. Qf6+ Kg8 3. Bh7+ Kxh7
4. Qxf7+ Kh8 5. Qf6+ Kh7 6. Qf7+
7 1.67 0.00 1. Rxg7 Kxg7 2. Qf6+ Kg8 3. Bh7+ Kxh7
4. Qxf7+ Kh8 5. Qf6+ Kh7 6. Qf7+
7 2.57 0.29 1. Be7 Bd8 2. Bf6 Bxf6 3. exf6 b5 4.
Rxg7 Rxe3 5. Qxh6#
7-> 2.90 0.29 1. Be7 Bd8 2. Bf6 Bxf6 3. exf6 b5 4.
Rxg7 Rxe3 5. Qxh6#
8 5.03 ++ 1. Be7!!
8 27.79 3.18 1. Be7 Bxe5 2. fxe5 Rxe7 3. Qxe7 Be6
4. Bg6 Kg8 5. Rf1
8-> 28.88 3.18 1. Be7 Bxe5 2. fxe5 Rxe7 3. Qxe7 Be6
4. Bg6 Kg8 5. Rf1
9 33.24 3.15 1. Be7 Bxe5 2. fxe5 Rxe7 3. Qxe7 Be6
4. Bg6 Kg8 5. Rf1 Rf8
9 39.00 ++ 1. Rxg7!!
9 7:36 Mat09 1. Rxg7 b5 2. Rh7+ Kg8 3. Rxh6 Qxh6
4. Qxh6 f5 5. exf6 Re7 6. fxe7 Bf5
7. Qf8+ Rxf8 8. exf8=Q+ Kh7 9. Bxf5#
9-> 7:38 Mat09 1. Rxg7 b5 2. Rh7+ Kg8 3. Rxh6 Qxh6
4. Qxh6 f5 5. exf6 Re7 6. fxe7 Bf5
7. Qf8+ Rxf8 8. exf8=Q+ Kh7 9. Bxf5#
time=7:38 cpu=100% mat=-1 n=66933119 fh=92% nps=145906
ext-> checks=6306864 recaps=83508 pawns=95968 1rep=921808 thrt:153
339
predicted=0 nodes=66933119 evals=896108
endgame tablebase-> probes done=0 successful=0
SMP-> split=0 stop=0 data=0/64 cpu=7:38 elap=7:38
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