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Subject: Re: If you are ready to solve one mate...

Author: Heiner Marxen

Date: 05:28:54 04/17/01

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On April 11, 2001 at 22:39:09, leonid wrote:

>On April 11, 2001 at 21:33:08, John Merlino wrote:
>
>>On April 11, 2001 at 21:25:08, Paul wrote:
>>
>>>On April 11, 2001 at 21:21:09, John Merlino wrote:
>>>
>>>>Chessmaster 8000 says Mate in 8:
>>>>
>>>>Time	Depth	Score	Positions	Moves
>>>>0:00	1/3	26.85	15041		1. Nxe6+ Nxe6 2. Nxc6+ Nxc6 3.
>>>>					Qfxf3 Bxb4+ 4. Nxb4 Qxb7 5. Qxb3
>>>>					Nexd4
>>>>0:01	1/4	Mate10	87791		1. Nxe6+ Nxe6 2. Nxc6+ Nxc6 3.
>>>>					Qxc7+ Nxc7 4. Qexe7+ Nxe7 5. Qxc7+
>>>>					Rxc7 6. Rxa8+ Nc8 7. Qxd7+ Rxd7
>>>>					8. Rxd7+ Kxd7 9. Qdb5+ Kd8 10.
>>>>					Qbxd6#
>>>>0:03	2/5	Mate08	181566		1. Nxe6+ Nxe6 2. Qxe7+ Bxe7 3.
>>>>					Nxc6+ Nxc6 4. Qbxc7+ Nxc7 5. Qexe7+
>>>>					Rxe7 6. Rxg8+ Be8 7. Qxe7+ Nxe7
>>>>					8. Qd6#
>>>>
>>>>jm
>>>
>>>Hey ... that's a bit slow, 3 seconds ... John, are you sure you didn't have 2
>>>engines running at the same time? ;)
>>>
>>>Paul
>>
>>Ok, I can see the humor in that LOW BLOW! ;-)
>>
>>jm
>
>If the time is for selective search then 3 second is very realistic number. Mine
>solved it by selective in 0.71 sec for 8 moves. I don't know how long it could
>take by brute force. I imagine that it will be much longer. 7 moves by brute
>force took already 11 min and 5 sec.
>
>Leonid.

[D]q1rkr1q1/RQpbpQR1/N1qbq1N1/n1NBN1n1/1Q1B1Q2/1q1Q1q2/3K4/2Q1Q3 w - -

Chest finds two moves that lead to a mate in 8 (K7/600, 350MB hash),
using 7.6 minutes (67.8 seconds for depth=7).  Here are the PVs:

Nxc6+ Nxc6 Qxc7+ Bxc7 Nxe6+  Nxe6 Qfxe7+ Nxe7 Qcxc7+ Rxc7 Rxa8+  Bc8  Qxc7+
Nxc7 Qd6#

Nxe6+ Nxe6 Qxe7+ Bxe7 Nxc6+  Nxc6 Qbxc7+ Nxc7 Qexe7+ Rxe7 Rxg8+  Be8  Qxe7+
Nxe7 Qd6#

Slowly I'm catching up with your problems  ;-)

Heiner



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