Author: Roy Eassa
Date: 12:58:22 08/26/02
Go up one level in this thread
On August 26, 2002 at 15:55:13, Roy Eassa wrote: >On August 26, 2002 at 01:03:39, John Merlino wrote: > >>On August 25, 2002 at 20:42:09, K. Burcham wrote: >> >>> >>>CCC-4 test position Rg4 >>> >>>hash set at 432 megs all tests >>> >>>Deep Fritz 7, 2 x 1533 mhz, 14:10 minutes, 1686 kns >>>Deep Fritz 7, 1 x 1533 mhz, 31:05 minutes, 947 kns >>>Deep Fritz 6, 2 x 1533 mhz, not found, 1290 kns >>>Deep Fritz 6, 1 x 1533 mhz, did not find, 1160 kns >>> >>> >>> [D] 8/4K2p/6pr/5pk1/1pB2R2/p4PP1/8/8 w - - 0 1 >> >>Chessmaster 9000, on a humble PIII-733, finds Rg4+ in 30 seconds. However, it >>does not see that it is winning after five minutes, and it appears that CM9000 >>would need to get to about depth 18 or 19 to see the win: >> >>Time Depth Score Positions Moves >>0:00 1/6 -0.91 17550 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >>0:00 2/7 -1.02 33219 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >> 4.Bd5 >>0:01 3/8 -0.68 97813 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >> 4.Bd5 h5 5.Rxa3 >>0:02 4/9 -0.68 243493 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >> 4.Bd5 h5 5.Rxa3 >>0:08 5/10 -0.44 837489 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >> 4.Bd5 h5 5.Rxa3 Rg1 6.Ra4 >>0:19 6/11 -0.47 2117898 1.Bd5 b3 2.Bxb3 Rh3 3.Ra4 Rxg3 >> 4.Bd5 h5 5.Rxa3 Rg1 6.Kd6 >>0:30 6/11 0.27 3547695 1.Rg4+ fxg4 2.f4+ Kh5 3.Bf7 b3 >> 4.Bxb3 g5 5.Bf7+ Rg6 6.f5 Kh6 7.fxg6 >> hxg6 8.Kf6 Kh5 9.Bxg6+ Kh6 >>0:34 7/12 0.00 4080860 1.Rg4+ fxg4 2.f4+ Kh5 3.Bf7 b3 >> 4.Bxb3 g5 5.Bf7+ Rg6 6.f5 a2 7.fxg6 >> a1=Q 8.g7+ Kh6 9.g8=Q Qf6+ 10.Kf8 >> Qe7+ 11.Kxe7 >>1:20 8/13 0.00 10095261 1.Rg4+ fxg4 2.f4+ Kh5 3.Bf7 b3 >> 4.Bxb3 g5 5.Bf7+ Rg6 6.f5 a2 7.fxg6 >> a1=Q 8.g7+ Kh6 9.g8=Q Qf6+ 10.Kf8 >> Qe7+ 11.Kxe7 >>3:50 9/14 0.00 26956945 1.Rg4+ fxg4 2.f4+ Kh5 3.Bf7 b3 >> 4.Bxb3 g5 5.Bf7+ Rg6 6.f5 a2 7.fxg6 >> a1=Q 8.g7+ Kh6 9.g8=Q Qf6+ 10.Kxf6 > ^ > | > | >Did CM9000 not see "9.g8=N mate" instead of "9.g8=Q" in those last two PVs? > >(Would it overlook a mate in 1 in preference of a non-mating move in the >lookahead? If so, is that because it involves an underpromotion?) Oops, my mistake, I didn't see that CM9000 had failed to find 3.Kf8! (Thus, in the line given by CM9000, 9.g8=N+ is not mate because Black has Kg7, winning.)
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