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Subject: Re: Why this move is so difficult for engines ?

Author: Mike Byrne

Date: 15:52:27 10/17/02

Go up one level in this thread


On October 17, 2002 at 04:51:28, Christophe Drieu wrote:

>[D] 8/4k3/4p3/pp5p/6p1/2P2rP1/PPK2R1P/8 w - - 0 1
>
>Rxf3 !

Crafty 19.00 SE (available for free via email to me , mfbyrne_pa@msn.com) sees
the winning move in 20 seconds.  Standard crafty may find it even faster.

Black(8): new
White(1): 8/4k3/4p3/pp5p/6p1/2P2rP1/PPK2R1P/8 w - - 0 1
White(1): go
end-game phase
              time surplus   0.00  time limit 1000:00 (1000:00)
              depth   time  score   variation (1)
                3->   0.04  -0.07   1. Rd2 e5 2. a3
                4     0.04  -0.36   1. Rd2 e5 2. Rd5 Rf2+ 3. Kd3
                4     0.04  -0.25   1. Re2 Kd6 2. Rd2+ Ke5 3. Re2+ Kd5
                                    4. Rd2+
                4->   0.04  -0.25   1. Re2 Kd6 2. Rd2+ Ke5 3. Re2+ Kd5
                                    4. Rd2+ (s=2)
                5     0.04  -0.23   1. Re2 Kd6 2. a3 a4 3. Rd2+ Kc5
                5     0.05  -0.11   1. Rd2 a4 2. Rd3 e5 3. h4
                5->   0.05  -0.11   1. Rd2 a4 2. Rd3 e5 3. h4
                6     0.05  -0.17   1. Rd2 a4 2. Re2 Kd6 3. Rd2+ Kc5 4.
                                    Rd3
                6->   0.07  -0.17   1. Rd2 a4 2. Re2 Kd6 3. Rd2+ Kc5 4.
                                    Rd3 (s=3)
                7     0.08  -0.16   1. Rd2 a4 2. a3 e5 3. Rd5 Rf2+ 4. Kd3
                                    Rxb2 5. Rxe5+ (s=2)
                7->   0.10  -0.16   1. Rd2 a4 2. a3 e5 3. Rd5 Rf2+ 4. Kd3
                                    Rxb2 5. Rxe5+ (s=2)
                8     0.32  -0.26   1. Rd2 Kf6 2. b3 e5 3. Rd5 Rf2+ 4.
                                    Rd2 Rf1 5. Kd3
                8->   0.36  -0.26   1. Rd2 Kf6 2. b3 e5 3. Rd5 Rf2+ 4.
                                    Rd2 Rf1 5. Kd3
                9     0.60  -0.24   1. Rd2 Kf6 2. Rd8 a4 3. Rd6 Kf5 4.
                                    Rd8 Rf2+ 5. Rd2 <HT>
                9->   0.68  -0.24   1. Rd2 Kf6 2. Rd8 a4 3. Rd6 Kf5 4.
                                    Rd8 Rf2+ 5. Rd2 <HT>
               10     1.30  -0.13   1. Rd2 Kf6 2. b3 Rf5 3. c4 bxc4 4.
                                    bxc4 Rc5 5. Rf2+ Ke7 6. Kd3 e5
               10->   1.46  -0.13   1. Rd2 Kf6 2. b3 Rf5 3. c4 bxc4 4.
                                    bxc4 Rc5 5. Rf2+ Ke7 6. Kd3 e5
               11     5.05  -0.21   1. Rd2 Kf6 2. Kb3 b4 3. Rd8 bxc3 4.
                                    bxc3 Ke7 5. Rd2 Rf5 6. c4 e5
               11->   8.16  -0.21   1. Rd2 Kf6 2. Kb3 b4 3. Rd8 bxc3 4.
                                    bxc3 Ke7 5. Rd2 Rf5 6. c4 e5
               12    17.72  -0.23   1. Rd2 a4 2. Rd3 Kf6 3. Rd4 e5 4. Rd5
                                    e4 5. Rxb5 Rf2+ 6. Kc1 Rxh2 7. Rd5
               12    20.19     ++   1. Rxf3!!
               12    21.66   0.47   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    h4 f2 5. Ke2 Kd6 6. Kxf2 a3 7. bxa3
                                    e4
               12->  21.93   0.47   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    h4 f2 5. Ke2 Kd6 6. Kxf2 a3 7. bxa3
                                    e4 (s=4)
               13    25.22   0.68   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 a3 5. bxa3 e4 6. h4 Kd6 7. g4 f2
                                    8. Kxf2 (s=3)
               13->  29.55   0.68   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 a3 5. bxa3 e4 6. h4 Kd6 7. g4 f2
                                    8. Kxf2 (s=3)
               14    31.30     ++   1. Rxf3!!
               14    38.54   1.78   1. Rxf3 gxf3 2. Kd3 e5 3. Ke3 e4 4.
                                    a4 bxa4 5. h4 <HT> (s=2)
               14->  50.75   1.78   1. Rxf3 gxf3 2. Kd3 e5 3. Ke3 e4 4.
                                    a4 bxa4 5. h4 <HT> (s=4)
               15     1:00   1.49   1. Rxf3 gxf3 2. Kd3 e5 3. Ke3 e4 4.
                                    a4 bxa4 5. h4 Kd6 6. g4 hxg4 7. Kf2
                                    Ke5 8. h5 Kf4 (s=3)
               15->   1:41   1.49   1. Rxf3 gxf3 2. Kd3 e5 3. Ke3 e4 4.
                                    a4 bxa4 5. h4 Kd6 6. g4 hxg4 7. Kf2
                                    Ke5 8. h5 Kf4 (s=5)
               16     1:55   1.70   1. Rxf3 gxf3 2. Kd3 e5 3. Ke3 e4 4.
                                    a4 bxa4 5. h4 Kf6 6. g4 hxg4 7. Kf2
                                    Kf5 8. c4 Kf4 9. c5 (s=4)
?              16     2:29   3/17*  1. Rd2
White(1): ?
              time=2:30  cpu=84%  mat=0  n=82139440  fh=96%  nps=546k
              ext-> chk=3326294 cap=311854 pp=1275893 1rep=73091 mate=1588
              predicted=0  nodes=82139440  evals=28059664
              endgame tablebase-> probes done=29  successful=29
              SMP->  split=1519  stop=75  data=9/32  cpu=2:06  elap=2:30

White(1): Rxf3



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