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

Author: Mike Byrne

Date: 16:45:15 10/17/02

Go up one level in this thread


for some reason the smp was turned off , here's the search with smp on...

Black(1): [d]8/4k3/4p3/pp5p/6p1/2P2rP1/PPK2R1P/8 w - - 0 1
White(1): d

       +---+---+---+---+---+---+---+---+
    8  |   |   |   |   |   |   |   |   |
       +---+---+---+---+---+---+---+---+
    7  |   |   |   |   | *K|   |   |   |
       +---+---+---+---+---+---+---+---+
    6  |   |   |   |   | *P|   |   |   |
       +---+---+---+---+---+---+---+---+
    5  | *P| *P|   |   |   |   |   | *P|
       +---+---+---+---+---+---+---+---+
    4  |   |   |   |   |   |   | *P|   |
       +---+---+---+---+---+---+---+---+
    3  |   |   | P |   |   | *R| P |   |
       +---+---+---+---+---+---+---+---+
    2  | P | P | K |   |   | R |   | P |
       +---+---+---+---+---+---+---+---+
    1  |   |   |   |   |   |   |   |   |
       +---+---+---+---+---+---+---+---+
         a   b   c   d   e   f   g   h

White(1): go
end-game phase
              clearing hash tables
              time surplus  29.80  time limit 100:00 (100:00)
              depth   time  score   variation (1)
                3->   0.00  -0.14   1. Rd2 e5 2. a3
                4     0.00  -0.36   1. Rd2 e5 2. Rd5 Rf2+ 3. Kd3
                4     0.00  -0.33   1. Re2 Kd6 2. Rd2+ Ke5 3. a3 Ke4
                4->   0.00  -0.33   1. Re2 Kd6 2. Rd2+ Ke5 3. a3 Ke4
                5     0.00  -0.32   1. Re2 Kd6 2. a3 Kd5 3. Kd2
                5     0.02  -0.15   1. Rd2 a4 2. Rd3 e5 3. Kd2
                5->   0.02  -0.15   1. Rd2 a4 2. Rd3 e5 3. Kd2 (s=2)
                6     0.02  -0.24   1. Rd2 a4 2. Re2 Kd6 3. Rd2+ Kc5 4.
                                    Rd3
                6->   0.03  -0.24   1. Rd2 a4 2. Re2 Kd6 3. Rd2+ Kc5 4.
                                    Rd3 (s=2)
                7     0.05  -0.19   1. Rd2 a4 2. a3 e5 3. Rd5 Rf2+ 4. Kd3
                                    Rxb2 5. Rxe5+
                7->   0.06  -0.19   1. Rd2 a4 2. a3 e5 3. Rd5 Rf2+ 4. Kd3
                                    Rxb2 5. Rxe5+ (s=2)
                8     0.14  -0.25   1. Rd2 a4 2. Rd1 e5 3. Rd5 Rf2+ 4.
                                    Rd2 Rf3 5. Rd3
                8->   0.17  -0.25   1. Rd2 a4 2. Rd1 e5 3. Rd5 Rf2+ 4.
                                    Rd2 Rf3 5. Rd3
                9     0.52  -0.25   1. Rd2 Kf6 2. Rd8 a4 3. Rd2 e5 4. Rd5
                                    Rf2+ 5. Rd2 Rf1
                9->   0.58  -0.25   1. Rd2 Kf6 2. Rd8 a4 3. Rd2 e5 4. Rd5
                                    Rf2+ 5. Rd2 Rf1
               10     1.27  -0.09   1. Rd2 Kf6 2. b3 e5 3. Rd5 Rf2+ 4.
                                    Kd3 Rxh2 5. Rxb5 Rxa2 6. Ke4
               10->   1.47  -0.09   1. Rd2 Kf6 2. b3 e5 3. Rd5 Rf2+ 4.
                                    Kd3 Rxh2 5. Rxb5 Rxa2 6. Ke4
               11     3.24  -0.20   1. Rd2 a4 2. Rd4 Rf2+ 3. Rd2 Rxd2+
                                    4. Kxd2 Kd6 5. Kd3 a3 6. b3 Kd5 7.
                                    Ke3 e5
               11->   3.70  -0.20   1. Rd2 a4 2. Rd4 Rf2+ 3. Rd2 Rxd2+
                                    4. Kxd2 Kd6 5. Kd3 a3 6. b3 Kd5 7.
                                    Ke3 e5
               12    12.27  -0.20   1. Rd2 Kf6 2. Kb3 Kf5 3. a4 b4 4. Kc4
                                    bxc3 5. bxc3 e5 6. Rd5 Rf2 7. Rxa5
                                    Rxh2
               12    13.24     ++   1. Rxf3!!
               12->  13.66   0.19   1. Rxf3 (s=2)
               13    14.20     ++   1. Rxf3!!
               13    14.92   0.68   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 e4 5. h4 Kd6 6. g4 <HT>
               13->  17.64   0.68   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 e4 5. h4 Kd6 6. g4 <HT> (s=4)
               14    18.52     ++   1. Rxf3!!
               14    21.17   1.56   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 Ke6 5. Kxf3 Kf5 6. Ke3 e4 7. Kd4
                                    a3 8. bxa3 (s=3)
               14->  30.11   1.56   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 Ke6 5. Kxf3 Kf5 6. Ke3 e4 7. Kd4
                                    a3 8. bxa3 (s=4)
               15    33.77   1.49   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 e4 5. h4 Kd6 6. g4 hxg4 7. Kf2
                                    Ke5 8. h5 Kf4 (s=3)
               15->   1:00   1.49   1. Rxf3 gxf3 2. Kd3 e5 3. a4 bxa4 4.
                                    Ke3 e4 5. h4 Kd6 6. g4 hxg4 7. Kf2
                                    Ke5 8. h5 Kf4 (s=4)
               16     1:18   1.70   1. Rxf3 gxf3 2. Kd2 e5 3. a4 bxa4 4.
                                    Ke3 e4 <HT> (s=3)
?              16     1:30   2/17*  1. Re2
White(1): ?
              time=1:36  cpu=197%  mat=0  n=127304472  fh=96%  nps=1320k
              ext-> chk=5205389 cap=554932 pp=2144971 1rep=113956 mate=2899
              predicted=1  nodes=127304472  evals=43808349
              endgame tablebase-> probes done=15  successful=15
              SMP->  split=2092  stop=154  data=11/32  cpu=3:10  elap=1:36

White(1): Rxf3
              time used:   1:36
Black(1):






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