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Subject: Re: Why is this position so difficult to the most programs?

Author: Robert Hyatt

Date: 04:52:37 08/11/98

Go up one level in this thread


On August 11, 1998 at 00:32:36, blass uri wrote:

>
>On August 10, 1998 at 20:48:24, Jouni Uski wrote:
>
>>wKh2,Ba5,Ra2,Pg2,h3/bKh4,Qc8,Pg6,h5
>>white to move
>>solution Rc2!!
>>
>>In my P90 Fritz5, Rebel9, Nimzo98 and CM5000 cannot find solution in 30
>>minutes, but there's exception: Mchess 7 finds it in 8'20''. How about
>>yours - I quess Chess Tiger solves this in one second...
>
>Junior5 as an engine for fritz5 solved this position after 3 minutes in my
>P200MMX
>
>Uri
>>
>>Jouni


Here is crafty, running on my quad-p6 machine:  It finds a draw at 16
seconds, Rc2 at 1:53 (1 min 53 secs, not 1 hour 53 minutes.. :)  )


              depth   time  score   variation (1)
                1     0.00  -2.37   1. Rf2
                1->   0.01  -2.37   1. Rf2
                2     0.01  -2.49   1. Rf2 Qe6
                2->   0.02  -2.49   1. Rf2 Qe6
                3     0.02  -2.66   1. Rf2 Qb8+ 2. Kg1 Qg3
                3     0.04  -2.42   1. Be1+ Kg5 2. Bg3 Kf5 3. Rf2+ Ke4
                                    4. Bd6
                3     0.04  -2.22   1. g3+ Kg5 2. Rf2 Kh6 3. Bb4
                3->   0.05  -2.22   1. g3+ Kg5 2. Rf2 Kh6 3. Bb4
                4     0.06  -2.06   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Bf4
                4->   0.07  -2.06   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Bf4
                5     0.09  -2.15   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Kg2 Qd7
                5->   0.12  -2.15   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Kg2 Qd7
                6     0.16  -2.12   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Be3 Qe6 5. Bc5
                6->   0.24  -2.12   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Be3 Qe6 5. Bc5
                7     0.38  -2.06   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Bg5 Qe6 5. Bf6+ Kf7 6. Kg2
                7->   0.59  -2.06   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kg7 4.
                                    Bg5 Qe6 5. Bf6+ Kf7 6. Kg2
                8     0.92  -2.12   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kh7 4.
                                    h4 Qc7 5. Bf4 Qg7 6. Bd6
                8->   1.31  -2.12   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kh7 4.
                                    h4 Qc7 5. Bf4 Qg7 6. Bd6
                9     2.14  -2.11   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kh7 4.
                                    Rf7+ Kg8 5. Rf2 Qc5 6. Rf3 Kg7 7. Bf4
                9->   6.11  -2.11   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kh7 4.
                                    Rf7+ Kg8 5. Rf2 Qc5 6. Rf3 Kg7 7. Bf4
               10     8.51  -2.12   1. g3+ Kg5 2. Rf2 Kh6 3. Bd2+ Kh7 4.
                                    Re2 Qc5 5. Bf4 g5 6. Be5 Kg6 7. Kg2
               10    12.43  -2.11   1. Rb2 Kg5 2. Rf2 h4 3. Bd2+ Kh5 4.
                                    g4+ hxg3+ 5. Kxg3 Qc4 6. Be3 Qe4 7.
                                    Rf3 Qh4+ 8. Kg2 g5
               10    16.08     ++   1. Rf2!!
               10    16.82   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 Kg5 6. Bd2+ Kh4
                                    7. Rf4+ Kg3 8. Rf3+ Kh4 9. Rf4+
               10->  16.86   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 Kg5 6. Bd2+ Kh4
                                    7. Rf4+ Kg3 8. Rf3+ Kh4 9. Rf4+
               11    17.23   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 <HT>
               11->  20.37   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 <HT>
               12    21.00   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 <HT>
               12->  27.24   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 <HT>
               13    28.62   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 Kg5 6. Bd2+ Kh4
                                    7. Be1
               13->  41.18   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 Kg5 6. Bd2+ Kh4
                                    7. Be1
               14    45.37   0.00   1. Rf2 Qb8+ 2. Kh1 Qb1+ 3. Kh2 Qd3
                                    4. Be1 Qd6+ 5. Kh1 Kg5 6. Bd2+ Kh4
                                    7. Be1
               14     1:53     ++   1. Rc2!!
               14->   1:53   0.29   1. Rc2
               15     2:14     ++   1. Rc2!!
               15     2:19   5.86   1. Rc2 Qxc2 2. Bd8+ g5 3. Ba5 Qe2 4.
                                    Bc7 Qf2 5. Bd6 Qg1+ 6. Kxg1 g4 7. Kh2
                                    Kg5 8. Kg3 h4+ 9. Kh2 Kf5 10. hxg4+
                                    Kxg4 11. Be7 <HT>
              time:  2:26  cpu:384%  mat:-2  n:53789967  nps:366666
              ext-> checks:3943628 recaps:64512 pawns:46212 1rep:979516
              predicted:0  nodes:53789967  evals:3549552
              endgame tablebase-> probes done: 44639  successful: 44639



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