Author: Heiner Marxen
Date: 09:04:23 03/10/02
Go up one level in this thread
On March 09, 2002 at 09:46:43, leonid wrote: >On March 07, 2002 at 19:48:08, Slater Wold wrote: > >>On March 07, 2002 at 08:05:18, Art Basham wrote: >> >>>Some programs that I have miss this mate in 4..! >>> >>>1. Qc6 wins for white!! >>> >>>[D]2kr1b1r/1pp1qp1p/3p2p1/1P1Pp3/2Q1P1n1/R4N2/1PP2PPP/5RK1 w - - >> >>White(2): setboard 2kr1b1r/1pp1qp1p/3p2p1/1P1Pp3/2Q1P1n1/R4N2/1PP2PPP/5RK1 w - - >> >>White(1): st 180 >>search time set to 180.00. >>White(1): go >> clearing hash tables >>crafty is behind 32.0 on time, reducing by 1/96. >> time surplus 0.00 time limit 3:00 (3:00) >> nss depth time score variation (1) >> 5 0.09 0.61 1. b6 Bh6 2. Ra8+ Kd7 3. Qb5+ c6 4. >> dxc6+ Ke6 5. Qd5+ Kf6 6. cxb7 Kg7 >> 5-> 0.09 0.61 1. b6 Bh6 2. Ra8+ Kd7 3. Qb5+ c6 4. >> dxc6+ Ke6 5. Qd5+ Kf6 6. cxb7 Kg7 >> 6 0.15 0.84 1. b6 Bg7 2. Ra8+ Kd7 3. Qb5+ c6 4. >> dxc6+ Ke6 5. Qd5+ Kf6 6. cxb7 Rb8 7. >> Ra7 >> 6-> 0.18 0.84 1. b6 Bg7 2. Ra8+ Kd7 3. Qb5+ c6 4. >> dxc6+ Ke6 5. Qd5+ Kf6 6. cxb7 Rb8 7. >> Ra7 >> 7 0.50 0.77 1. b6 Bh6 2. Rfa1 Rhf8 3. Ra8+ Kd7 >> 4. Qb5+ c6 5. dxc6+ Ke6 6. Qd5+ Kf6 >> 7. cxb7 Kg7 >> 7 0.61 ++ 1. Qc6!! >> 7 0.62 Mat04 1. Qc6 bxc6 2. dxc6 Kb8 3. Rfa1 Nf6 >> 4. Ra8# >> (3) 7-> 0.62 Mat04 1. Qc6 bxc6 2. dxc6 Kb8 3. Rfa1 Nf6 >> 4. Ra8# >> time=0.84 cpu=148% mat=-2 n=918801 fh=94% nps=1093k >> ext-> chk=38957 cap=7162 pp=6426 1rep=5746 mate=731 >> predicted=0 nodes=918801 evals=98158 >> endgame tablebase-> probes done=0 successful=0 >> hashing-> trans/ref=44% pawn=98% used=3% >> SMP-> split=141 stop=14 data=6/32 cpu=1.25 elap=0.84 >> >>mate in 4 moves. > >I looked by curiousity this position with my mate solver and found that finding >of mate goes slowly. Even when mate was found by few versions of selective >search time was still identical. > >LLchess mate solver. Celeron 600Mhz. No hash. > >Mate in 4 moves found and took 0.21 sec. First move goes by white queen C4-C6. This is almost the same time Chest needs on equal hardware: 0.17 secs without hash and 0.16 secs with hash. So you are in good company. >Initial move was real surprise! I had seen this kind of mate attack earlier, so for me the surprise was not so big. >Leonid. Cheers, Heiner
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