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Subject: Re: Mate in about 12......good test

Author: Frank E. Oldham

Date: 12:38:03 05/07/04

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On May 06, 2004 at 14:36:44, Rob Basham wrote:

>[D]1rr3k1/2q1ppb1/p2pbnp1/6Q1/1p1BP1P1/P1N2P2/1PP4R/2K2B1R w - - 0 1
>
>White plays....1.Qh6...!
>
>Ruffian 1.0.1 finds it at 11 ply....in 2 minutes, 17 seconds......P3/850.

Crafty19.10f chooses it in ply 10, sees the fail-high in ply 11
 -- fail-highs again in ply 12 and ply 13 :-)

                9->   6.15   0.11   1. axb4 Rxb4 2. Qe3 Qa5 3. Kb1 Rcb8
                                    4. b3 Qc7 5. g5 Ng4 (s=2)
               10    11.88  -0.15   1. axb4 Rxb4 2. Qd2 Qa5 3. Nb1 Rxc2+
                                    4. Qxc2 Rxd4 5. Bd3 Qb6 6. Nd2 Kf8
               10    32.48   0.01   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bxf6 exf6
                                    4. Rh8+ Kg7 5. R1h7+ Kg6 6. Rh6+ Kg7
                                    7. R6h7+
               10->  32.49   0.01   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bxf6 exf6
                                    4. Rh8+ Kg7 5. R1h7+ Kg6 6. Rh6+ Kg7
                                    7. R6h7+ (s=3)
               11    46.98     ++   1. Qh6!!
               11     1:02   3.57   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bf5
                                    4. Bxf6 exf6 5. exf5 Kg7 6. Rh7+ Kf8
                                    7. Rh8+ Ke7 8. Nd5+ Kd7 9. Nxc7 Rxh8
                                    10. Rxh8 Rxh8 11. Nxa6 bxa3 12. bxa3
                                    (s=2)
               11->   1:03   3.57   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bf5
                                    4. Bxf6 exf6 5. exf5 Kg7 6. Rh7+ Kf8
                                    7. Rh8+ Ke7 8. Nd5+ Kd7 9. Nxc7 Rxh8
                                    10. Rxh8 Rxh8 11. Nxa6 bxa3 12. bxa3
               12     1:29     ++   1. Qh6!!
               12     2:25   6.14   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bf5
                                    4. Bxf6 exf6 5. exf5 Kg7 6. Rh7+ Kf8
                                    7. Nd5 Ke8 8. Nxc7+ Rxc7 9. axb4 Rxb4
                                    10. Bxa6
               12->   2:28   6.14   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bf5
                                    4. Bxf6 exf6 5. exf5 Kg7 6. Rh7+ Kf8
                                    7. Nd5 Ke8 8. Nxc7+ Rxc7 9. axb4 Rxb4
                                    10. Bxa6
               13     4:30     ++   1. Qh6!!
               13     7:51   7.57   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bxg4
                                    4. Rh8+ Kg7 5. R1h7+ Kg6 6. e5+ Ne4
                                    7. Rh6+ Kg7 8. exd6+ f6 9. R8h7+ Kf8
                                    10. dxc7 Rxc7 11. Rh8+ Kf7 12. R6h7+
                                    Ke6 13. Rxb8 Nxc3 14. fxg4
               13->   8:05   7.57   1. Qh6 Bxh6+ 2. Rxh6 g5 3. Bd3 Bxg4
                                    4. Rh8+ Kg7 5. R1h7+ Kg6 6. e5+ Ne4
                                    7. Rh6+ Kg7 8. exd6+ f6 9. R8h7+ Kf8
                                    10. dxc7 Rxc7 11. Rh8+ Kf7 12. R6h7+
                                    Ke6 13. Rxb8 Nxc3 14. fxg4
White(1): ?
              time=8:08  cpu=390%  mat=0  n=1143529906  fh=90%  nps=2.34M
              ext-> chk=56837785 cap=3516585 pp=2263548 1rep=6222149
mate=1496303
              predicted=0  nodes=1143529906  evals=435516593
              endgame tablebase-> probes=0  hits=0
              SMP->  split=1272  stop=181  data=7/32  cpu=31:48  elap=8:08

Frank



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