Author: John Merlino
Date: 12:56:58 07/29/02
Go up one level in this thread
On July 29, 2002 at 15:30:55, Jim Monaghan wrote: >Hi everyone, > >I've also been working a little more with the really tough positions. I thought >I'd post a couple with the solutions to see if anyone out there can solve them. >A good test position is always interesting. If there's interest I'll post >others. On a Cel 1.3 Ghz/256 with 32MB hash after 5 minutes Shredder misses >these: > >[D]4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - > >4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - bm Nc5; id "IQ.1081"; >Dzhindzhikhashvili-Tukmakov, Leningrad 1971 >1. Nc5!! Rf4 (1... Rxc5 2. Qh8+ Nf8 3. Rxc5) 2. Qh8+ Nf8 3. Rd8+! Kxd8 4. Qf8+ >Kc7 5. Qxe7+ Kc6 6. Qxb7+ (1-0) Chessmaster 9000, for the first 1:05 (on a PIII-600), never considers anything other than Nc5. However, it feels that 1...Qh5 is Black's best reply. For a long time after that, it feels that 1.Qh8+ is best. Then, at 11:07, it switches back to 1.Nc5. Perhaps 1...Qh5 holds for Black? Time Depth Score Positions Moves 0:00 1/3 0.04 3833 1.Nc5 Qh5 2.Qxh5 gxh5 3.Nxb7 0:00 1/4 0.00 10867 1.Nc5 Qh5 2.Qxh5 gxh5 3.Nxb7 h4 0:00 1/5 0.18 33081 1.Nc5 Qh5 2.Qxh5 gxh5 3.Nxb7 Re4 4.Kc2 0:01 1/6 0.10 92341 1.Nc5 Qh5 2.Qxh5 gxh5 3.Nxe6 fxe6 4.Rb5 b6 5.Kc2 0:02 1/7 0.08 194494 1.Nc5 Qh5 2.Qxh5 gxh5 3.g6 Rg4 4.gxf7+ Kxf7 5.Nxb7 0:06 1/8 0.03 481071 1.Nc5 Qh5 2.Qxh5 gxh5 3.g6 Rg4 4.gxf7+ Kxf7 5.Nxb7 Rg1+ 6.Kc2 h4 0:13 1/9 0.07 1220164 1.Nc5 Qh5 2.Qxh5 gxh5 3.g6 Rg4 4.gxf7+ Kxf7 5.Nxb7 h4 6.Rd7 Rg1+ 7.Ka2 0:30 2/10 -0.05 2876505 1.Nc5 Qh5 2.Qxh5 gxh5 3.g6 Rg4 4.gxf7+ Kxf7 5.Nxb7 Rg1+ 6.Kc2 h4 7.Rd3 1:05 2/10 0.00 6209020 1.Qh8+ Nf8 2.Nf6+ exf6 3.Rd8+ Kxd8 4.Qxf8+ Kc7 5.Qd6+ Kc8 6.Qf8+ Kc7 2:46 3/11 0.00 16278497 1.Qh8+ Nf8 2.Nf6+ exf6 3.Rd8+ Kxd8 4.Qxf8+ Kc7 5.Qd6+ Kc8 6.Qf8+ Kc7 9:27 4/12 0.00 54626657 1.Qh8+ Nf8 2.Nf6+ exf6 3.Rd8+ Kxd8 4.Qxf8+ Kc7 5.Qd6+ Kc8 6.Qf8+ Kc7 11:07 4/12 0.06 64298251 1.Nc5 Qh5 2.Qxh5 gxh5 3.g6 b6 4.Nxe6 fxe6 5.Rd3 Rg4 6.Rh3 Rxg6 7.Rxh5 Rg1+ 8.Kc2 Rg2+ 9.Kb3 >[D]4k3/pp2pp2/4n1p1/3RP1P1/2r1N3/P1P5/1P2q3/1K5Q w - - Here's another one that Chessmaster 9000 waffles on. From 2 through 7 seconds, it picks 1.Nxf5. Then from 0:08 through 1:29, it wants 1.Nxd5. After 1:29, it goes back to (and sticks with) 1.Nxf5: Time Depth Score Positions Moves 0:00 1/5 -1.19 1949 1.Ng2 Nc4 2.Nf4 Nd2 3.Ke3 0:00 2/6 -1.14 5137 1.Ng2 Nc4 2.Nf4 Nd2 3.Ke3 Ne4 0:00 3/7 -1.21 10676 1.Ng2 Nc4 2.Nf4 Nd2 3.g6 fxg6 4.Nxe6 0:00 4/8 -1.16 24050 1.Ng2 Nc4 2.Nf4 Kc6 3.g6 fxg6 4.Nxe6 Nd2 5.Nf4 0:01 5/9 -1.24 88354 1.Ng2 Nd7 2.Nf4 Nb8 3.Nd3 Nc6+ 4.Kc3 d4+ 5.Kb3 Na5+ 6.Ka2 Nc4 7.Kb3 0:02 5/9 -0.17 157901 1.Nxf5 exf5 2.e6 fxe6 3.g6 e5+ 4.Kxe5 Nd7+ 5.Kxf5 hxg6+ 6.Kxg6 Nf8+ 7.Kg7 Ne6+ 8.Kg8 Ng5 0:04 6/10 0.93 380795 1.Nxf5 Nc4 2.Nd6+ Nxd6 3.exd6 Kc6 4.Ke5 Kd7 5.c3 Kc6 6.g6 fxg6 7.Kxe6 0:07 7/11 0.93 637042 1.Nxf5 Nc4 2.Nd6+ Nxd6 3.exd6 Kc6 4.Ke5 Kd7 5.c3 Kc6 6.g6 fxg6 7.Kxe6 0:08 7/11 1.47 769227 1.Nxd5 exd5 2.e6 fxe6 3.g6 e5+ 4.Kd3 hxg6 5.h7 e4+ 6.Ke2 f4 7.h8=Q f3+ 8.Kf2 Nc4 0:12 8/12 1.34 1097278 1.Nxd5 Nxd5 2.c4+ Kc6 3.cxd5+ Kd7 4.d6 Kc6 5.Kd3 Kd7 6.Ke3 Kc6 7.Kf3 Kd7 8.Kf4 0:23 9/13 1.42 2112221 1.Nxd5 Nxd5 2.c4+ Kc6 3.cxd5+ Kd7 4.d6 Kc6 5.Kd3 Kd7 6.Ke3 Ke8 7.Kf3 Kd8 8.Kf4 Kd7 0:52 10/14 1.34 4797279 1.Nxd5 Nxd5 2.c4+ Kc6 3.cxd5+ Kd7 4.d6 Kc6 5.Kd3 Kd7 6.Ke3 Ke8 7.Kf3 Kd8 8.Kg3 Kd7 9.Kf4 1:29 10/14 1.38 8248855 1.Nxf5 Nd7 2.Nd6+ Kc6 3.Nxf7 Nf8 4.c4 dxc4 5.Kxc4 Ng6 6.Kd4 Ne7 7.Nd6 Kd7 8.Ke4 Kc6 2:44 11/15 1.42 15062972 1.Nxf5 Nd7 2.Nd6+ Kc6 3.Nxf7 Nf8 4.Nd6 Ng6 5.Ne8 Nh4 6.Kc3 d4+ 7.Kd3 Nf3 8.Nf6 Nxg5 9.Kxd4 Nf3+ 10.Ke3 5:54 12/16 1.46 32232027 1.Nxf5 Nd7 2.Nd6+ Kc6 3.Nxf7 Nf8 4.Nd6 Kd7 5.c4 dxc4 6.Ne4 Ke7 7.Kxc4 Kf7 8.Kd4 Ng6 9.Nd6+ Ke7 jm
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