Author: Steven J. Brann
Date: 18:49:58 03/04/01
Go up one level in this thread
On March 04, 2001 at 12:49:05, Heiner Marxen wrote:
>On March 04, 2001 at 08:24:38, Steven J. Brann wrote:
>
>>[D]2k1rbr1/1pp5/p3P1qp/1Q4p1/3P1p2/6N1/5PPP/R1B1R1K1 w - - 0 1
>>
>>This game was played by correspondence in 1875. Mrs. Berry announced mate in 18
>>from this position. Can your computer do the same? I doubt it. CM8000 found a
>>winning line in 18 moves (different than Mrs. Berry's), but wouldn't announce
>>mate until 6 moves into the solution. I'll post Ms. Berry's play and CM8000's
>>line after you have a go at it.
>
>This one appears to be out of reach for Chest. On my K7/600 (350 MB hash)
>it needs already twenty minutes for "no mate in 8". The effective branching
>factor is around 8. Provided, there is not a much shorter mate: No chance!
>
>Now I'm waiting for the solution, to study it carefully!
>
>Heiner
Here's the original mate and the CM8000 equivalent. Enjoy
{Mrs. Berry announces Mate in 18 from this position} 1. Rxa6 bxa6 2.
Qxa6+ Kb8 3. Qb5+ Kc8 4. Qd7+ Kb8 5. Bxf4 gxf4 6. Qb5+ Kc8 7. Ra1 Ba3 8.
Rxa3 Qb1+ 9. Qxb1 Rxe6 10. Ra7 Kd7 11. Qb5+ Rc6 12. d5 Rg6 13. dxc6+
Rxc6 14. Ne4 f3 15. Qd5+ Rd6 16. Qxd6+ Ke8 17. Qxc7 h5 {Any move} 18.
Ra8# 1-0
Best play analysis by CM 32Meg hash at 10 minutes per move:
1. Rxa6 bxa6 2. Qxa6+ Kb8 3. Bxf4 Rxe6 4. Rxe6 Qb1+ 5. Nf1 Bd6 6. Bxd6
Qb7 7. Bxc7+ Kc8 8. Qa4 Kxc7 9. Re7+ Kb8 10. Rxb7+ Kxb7 11. Qb3+ Kc7 12.
Qxg8 g4 13. Qe6 Kb7 14. Ne3 g3 15. Nd5 gxf2+ 16. Kxf2 Ka8 17. Qb6 h5 18.
Nc7# 1-0
Steve
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