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Subject: Re: Nice tactical shot.

Author: Vincent Diepeveen

Date: 16:30:32 01/24/02

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On January 24, 2002 at 05:49:44, Steve Timson wrote:

>Chester finds it in 2.17 seconds on my athlon 1200.
>
>    0.04s    5         12836    +0.93  1. Bxf8 Rxf8 2. Bg2 h5 3. Qf4 g5
>    0.06s    5         18822    +1.18  1. Bg5 h5 2. Qh4 Be7 3. Bxe7 Qxe7
>    0.08s    5f        26432    +1.18  1. Bg5 h5 2. Qh4 Be7 3. Bxe7 Qxe7
>    0.17s    6         56856    +1.05  1. Bg5 Qd6 2. Bf6 h5 3. Qf4 Qxf4 4. gxf4
>    0.24s    6f        77411    +1.05  1. Bg5 Qd6 2. Bf6 h5 3. Qf4 Qxf4 4. gxf4
>    0.42s    7        139485    +0.74  1. Bg5 Be7 2. Bxe7 Qxe7 3. Qf3 O-O-O 4.
>Bxc6 Rxd4
>    1.02s    7        358732    +0.99  1. Bxf8 Rxf8 2. Qf3 Qc7 3. Qf6 Qd8 4. Qe5
>    1.02s    7f       358732    +0.99  1. Bxf8 Rxf8 2. Qf3 Qc7 3. Qf6 Qd8 4. Qe5
>    1.27s    8        447089    +0.64  1. Bxf8 Rxf8 2. Qf3 Qc7 3. Qf6 Qe7 4. Qg7
>O-O-O 5. Qxh7 Rxd4 6.Bxg6
>    1.77s    8        635405    +0.74  1. Bg5 Be7 2. Bxe7 Qxe7 3. Qf3 O-O-O 4.
>Bxc6 Rxd4 ...
>    2.17s    8        765990    +1.49  1. Bxc6+(FH)
>    2.40s    8        832577    +1.35  1. Bxc6+ Bxc6 2. Rxe6+ Kd7 3. Re7+ Kxe7
>4. Re1+ Kd6 5. Bf4+ Kd5 6. Qf3+ Kc4 7. Qb3+ Kxd4 8. Qc3+ Kd5 9. Re5+ Kd6 10.
>Re8+ Kd5 11. Rxd8+ Rxd8 12. Qxh8
>
>It continues to fail high from then on evetually settling on the following pv:
>
> 20.19s   10       6278799    +3.03  1. Bxc6+ Bxc6 2. Rxe6+ fxe6 3. Qxe6+ Be7 4.
>Qxc6+ Kf7 5. Re1 Rc8 6. Qe6+ Ke8 7. d5 Rf8 8. d6 Rf7 9. dxe7 Qd7 10. Qe4 Rxe7
>
>I guessed that singular extensions were helping, so I turned them off and tried
>it again.  It then took 10 seconds and depth 10 to see it.
>
>   10.39s   10       3299855    +1.07  1. Bxc6+ Bxc6 2. Rxe6+ fxe6 3. Qxe6+ Be7
>4. Qxc6+ Kf7 5. Qf3+ Bf6 6. Qb3+ Ke8 7. Re1+ Kd7 8. Qc4

obviously that is evaluation function. NOT singular extensions.
your evaluation is too optimistic about 3 pawns vs piece.

> - Steve



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