Author: John Merlino
Date: 16:58:41 05/21/05
Go up one level in this thread
On May 21, 2005 at 17:50:19, Dieter Buerssner wrote:
>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
I gotta admit I love that feature of Yace. :-)
jm
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