Author: Dieter Buerssner
Date: 14:50:19 05/21/05
Go up one level in this thread
On May 21, 2005 at 17:42:40, John Merlino wrote:
>On May 21, 2005 at 11:16:37, Steven Edwards wrote:
>
>>On May 21, 2005 at 10:54:12, David Dahlem wrote:
>>
>>>What's the shortest forced mate from this position, and can any engine find it
>>>without tablebases?
>>>
>>>[D]2KB4/1P6/2k5/8/8/8/7b/8 w - - 0 1
>>
>>1. Bg5 Kb5 2. Be3 Ka6 3. Bc5 Be5 4. Be7 Kb5 5. Bd8 Kc6 6. Bf6 Bc7 7. Bd4 Bd6 8.
>>Ba7 Be5 9. Bb8 Bd4 10. Bc7 Ba7 11. Bf4 Kb5 12. Be3 Bxe3 13. b8=Q+ Kc4 14. Kd7
>>Kd5 15. Qb3+ Kd4 16. Ke6 Bd2 17. Qa4+ Kd3 18. Kd5 Bc3 19. Qa3 Kd2 20. Kc4 Bf6
>>21. Qd3+ Ke1 22. Qc2 Kf1 23. Kd3 Bb2 24. Ke3 Bc1+ 25. Kf3 Bd2 26. Qxd2 Kg1 27.
>>Qg2# 1-0
>
>Both 1.Bg5 and 1.Bh4 lead to a mate in 27. Here's how Chessmaster plays it out:
Yace confirms this. The PV may give little bit more information:
1...Kb6 {EGTB} 2.Bf2+! Ka6! 3.Bc5! Bg3 4.Be7!
Kb6 5.Bd8+! Kc6! 6.Bh4! Bf4 7.Bf2! Bd6 8.Ba7!
Be5! 9.Bb8! Bd4! 10.Bc7 Ba7! 11.Bf4 Kd5 12.Be3!
Bxe3! 13.b8=Q!! Bd4 14.Kd7! Be3 15.Qb5+ Bc5
16.Qe2 Bd4 17.Qe6+! Kc5 18.Qc6+! Kb4 19.Kd6 Ba7
20.Qb7+ Bb6 21.Qxb6+! Kc3! 22.Qe3+ Kc2 23.Kd5
Kb2 24.Qd2+ Kb3 25.Kc5! Ka3! 26.Kc4! Ka4
27.Qa2# {-1001}
! moves for the attacker mean: this is the best move, other moves may win, but
with a longer mate. ! moves for the defender: all other moves will allow shorter
mate for the attacker. !! move for the attacker: only move, that wins (any other
move will draw ór lose).
Regards,
Dieter
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