Author: Heiner Marxen
Date: 11:21:14 01/27/03
Go up one level in this thread
On January 26, 2003 at 16:43:48, Steven J. Brann wrote: >On January 26, 2003 at 08:49:28, Lyn Harper wrote: > >> >> [D]3r2k1/5p2/3R2p1/2rRp1b1/2q1P1Pp/3Q3P/6P1/3N3K b >> >> Interesting position solved by Boris Gelfand in 1999 in his game against >> Sergei Movsesian. >> It's a mate in 11. My mid range comp (slow P4) took 1min33secs running CM9K. >> How does yours go? Black to move, of course. > >CM9000 certainly shines here. Finds mate in 11 in 37 seconds on my P4 1.9G >computer. Default personality except for SS=14 and 256MB of hash. I've found >that increasing the selective search usually decreases mate solving times. > > >Time Depth Score Positions Moves >0:00 1/6 -10.45 26691 1...Rxd5 2.Rxd8+ Rxd8 3.Qf3 Rd3 > 4.Ne3 Rxe3 >0:00 1/7 -11.21 51513 1...Rxd5 2.Rxd5 Rxd5 3.Qf3 Rd3 > 4.Kg1 Rxf3 5.gxf3 >0:00 1/8 -11.40 78516 1...Rxd5 2.Rxd5 Rxd5 3.Qf3 Rd3 > 4.Kg1 Rxf3 5.gxf3 Qe2 >0:01 1/9 -11.44 131391 1...Rxd5 2.Rxd5 Rxd5 3.Qf3 Rd3 > 4.Ne3 Rxe3 5.Qd1 Qxe4 >0:01 1/10 -11.67 234574 1...Rxd5 2.Rxd5 Rxd5 3.Qf3 Rd3 > 4.Ne3 Rxe3 5.Qf2 Qxe4 6.Kh2 Re2 >0:04 1/11 -13.90 743101 1...Rxd5 2.Rxd5 Rxd5 3.Qf3 Rd3 > 4.Kg1 Rxf3 5.gxf3 Qc1 6.Kg2 Qxd1 > 7.Kf2 Qd2+ 8.Kf1 >0:09 1/12 -15.10 1950297 1...Rxd5 2.Rxd5 Rxd5 3.Ne3 Qxd3 > 4.Nxd5 Qxe4 5.Nf6+ Bxf6 6.Kh2 Qf4+ > 7.Kh1 Qd2 8.Kh2 e4 >0:28 1/13 -Mate12 7144098 1...Rxd5 2.Rxd5 Rxd5 3.Qxc4 Rxd1+ > 4.Kh2 Bf4+ 5.g3 hxg3+ 6.Kg2 Rd2+ > 7.Qe2 Rxe2+ 8.Kf1 Rd2 9.h4 g2+ > 10.Kg1 Be3+ 11.Kh2 g1=Q+ 12.Kh3 > Qg2# >0:37 1/14 -Mate11 9914560 1...Rxd5 2.Rxd5 Rxd5 3.Qxc4 Rxd1+ > 4.Kh2 Bf4+ 5.g3 hxg3+ 6.Kg2 Rd2+ > 7.Qe2 Rxe2+ 8.Kg1 Be3+ 9.Kf1 Rd2 > 10.Ke1 g2 11.h4 g1=Q# > > >Steve Chest announces "no mate in 10" (28.3 minutes, Athlon 1500+, 128MB). Hence, the mate in 11 is the shortest possible solution. Cheers, Heiner
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