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Subject: Re: A Missed Mate in 4

Author: Slater Wold

Date: 16:48:08 03/07/02

Go up one level in this thread


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.



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