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Subject: Re: Mate to torture.

Author: leonid

Date: 02:40:22 11/05/03

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On November 05, 2003 at 02:58:28, Vincent Lejeune wrote:

>On November 02, 2003 at 09:08:36, leonid wrote:
>
>>Hi,
>>
>>If You would like to torture a little bit Your program then find mate here:
>>
>>[D] 3QN3/2RqqP2/1Pq1krB1/Qq1b2rR/1NqBqPnK/2Q1q1NQ/4p2P/2bbn3 w - -
>>
>>This this an old position where I do not see minimal number of moves. If You
>>will find shortest mate, please indicate that number.
>>
>>Cheers,
>>Leonid.
>
>CM9k skr+ss=16
>barton 2800+
>
>Time	Depth	Score	Positions	Moves
>----	----	----	----		----
>0:00	1/3	0.00	91639		1.Ng7+ Kd6 2.Nxe4+ Q3xe4 3.Ne8+
>					Ke6 4.Ng7+ Kd6
>0:05	1/4	0.00	936720		1.Ng7+ Kd6 2.Nxe4+ Q3xe4 3.Rxd7+
>					Qcxd7 4.Ne8+ Ke6 5.Ng7+ Kd6
>0:32	1/5	0.00	6276560		1.Ng7+ Kd6 2.Nxe4+ Q3xe4 3.Rxd7+
>					Qcxd7 4.Qb8+ Qdc7 5.Ne8+ Ke6 6.Ng7+
>					Kd6
>5:10	1/6	0.00	65576171	1.Ng7+ Kd6 2.Nxe4+ Q3xe4 3.Rxd7+
>					Qcxd7 4.Qb8+ Qdc7 5.Ne8+ Ke6 6.Ng7+
>					Kd6
>7:12	1/6	14.31	92967093	1.Qxe7+ Qxe7 2.Rxe7+ Kxe7 3.Qa7+
>					Kd8 4.Bxf6+ Qe7 5.Bxe7+ Qxe7 6.Qxe7+
>					Kxe7 7.f8=Q+ Kd7 8.Rh7+ Bf7 9.Rxf7+
>					Kd8 10.Nxc6+ Qbxc6 11.Qe7+ Kc8
>					12.Qc7+ Qxc7 13.Rxc7+ Kb8 14.Rxc4
>					Rxg6
>8:16	1/7	Mate14	108050193	1.Qxe7+ Qxe7 2.Rxe7+ Kxe7 3.Qa7+
>					Kd8 4.Bxf6+ Kc8 5.Nd6+ Qxd6 6.Qxc4+
>					Bxc4 7.Rh8+ Qee8 8.Rxe8+ Qexe8
>					9.b7+ Qxb7 10.fxe8=Q+ Kc7 11.Qeb8+
>					Kd7 12.Qaxb7+ Qc7 13.Q7xc7+ Ke6
>					14.Qe7#
>22:17	1/8	Mate13	295082323	1.Qxe7+ Qxe7 2.Rxe7+ Kxe7 3.Qa7+
>					Kd8 4.Bxf6+ Kc8 5.Nd6+ Qxd6 6.Qxc4+
>					Bxc4 7.Rh8+ Qee8 8.Rxe8+ Qexe8
>					9.b7+ Qxb7 10.fxe8=Q+ Kc7 11.Bd8+
>					Kc8 12.Bb6+ Qd8 13.Qxd8#

Up to now it is only Your program that was able to find mate on this position
and at very good time.

Mine was able to find mate only with selective search and 13 moves deep. I do
not know exact depth of this position. Since somebody already indicated that it
not contain mate in 11, it can be only mate in 12 or 13.

Cheers,
Leonid.



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