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Subject: Test position, Crafty solved, but ....

Author: Jim Monaghan

Date: 11:40:16 02/07/01


[D] 4k3/8/4K3/b7/8/4p3/6pP/2R5 w - - 0 1

Although Crafty "solves" this study, it's odd that it still thinks that
it's losing. Crafty is not alone in it's evaluation of the final position.
Many engines "think" it's an advantage to have 2 bishops of the same colour in
an endgame situation.
I guess in a way it doesn't matter ... if this had been a game situation,
Crafty would have chosen the right path anyway.
Neat stalemate idea.

nss  depth   time  score   variation (1)
                7     1.15  -3.74   1. Rc8+ Bd8 2. Rc1 e2 3. h4 Kf8 4.
                                    h5 Bb6 5. Rc8+ Kg7 6. h6+ Kxh6
                7->   1.43  -3.74   1. Rc8+ Bd8 2. Rc1 e2 3. h4 Kf8 4.
                                    h5 Bb6 5. Rc8+ Kg7 6. h6+ Kxh6
                8     1.73     ++   1. Rc8+!!
                8->   2.66  -3.35   1. Rc8+ Bd8 2. Rc1 e2 3. h4 Kf8 4.
                                    h5 Bb6 5. Rc8+ Kg7 6. h6+ Kxh6
                9     3.05     --   1. Rc8+
                9     7.71  -5.70   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Bb6 5. Rxe2 g1=Q 6. Re4 Kg7
                9->   8.85  -5.70   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Bb6 5. Rxe2 g1=Q 6. Re4 Kg7
               10    10.20     --   1. Rc8+
               10    11.34  -6.11   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Ba5 5. Rxe2 g1=Q 6. Re5 Qg6+ 7.
                                    Kd7 Qd3+ 8. Kc6
               10->  13.65  -6.11   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Ba5 5. Rxe2 g1=Q 6. Re5 Qg6+ 7.
                                    Kd7 Qd3+ 8. Kc6
               11    17.78  -6.19   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Ba5 5. Rxe2 g1=Q 6. Re5 Qg6+ 7.
                                    Kd5 Qd3+ 8. Kc6 <HT>
               11->  21.01  -6.19   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Ba5 5. Rxe2 g1=Q 6. Re5 Qg6+ 7.
                                    Kd5 Qd3+ 8. Kc6 <HT>
               12    24.80     --   1. Rc8+
               12     1:35  -7.40   1. Rc8+ Bd8 2. Rc1 e2 3. h3 Kf8 4.
                                    Re1 Bb6 5. Rxe2 g1=Q 6. Re5 Qg3 7.
                                    Rf5+ Kg7 8. Rb5 Qxh3+ 9. Kd5
               12     2:21  -7.01   1. Kf5 e2 2. Kg4 e1=Q 3. Rxe1+ Bxe1
                                    4. Kh3 g1=B 5. Kg2 Bgf2 6. Kh3 Kf7
                                    7. Kg4 Kf6
               12->   2:26  -7.01   1. Kf5 e2 2. Kg4 e1=Q 3. Rxe1+ Bxe1
                                    4. Kh3 g1=B 5. Kg2 Bgf2 6. Kh3 Kf7
                                    7. Kg4 Kf6
               13     2:52  -6.90   1. Kf5 e2 2. Kg4 e1=Q 3. Rxe1+ Bxe1
                                    4. Kh3 g1=B 5. Kg2 Bgf2 6. Kh3 Kf7
                                    7. Kg4 Kf6 8. h3
               13->   3:09  -6.90   1. Kf5 e2 2. Kg4 e1=Q 3. Rxe1+ Bxe1
                                    4. Kh3 g1=B 5. Kg2 Bgf2 6. Kh3 Kf7
                                    7. Kg4 Kf6 8. h3
               14     4:35  -6.98   1. Kf5 e2 2. Kg4 e1=Q 3. Rxe1+ Bxe1
                                    4. Kh3 g1=B 5. Kg2 Bgf2 6. Kh3 Kf7
                                    7. Kg4 Kf6 8. h3 Bd2
Cheers,

Jim



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