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Subject: Re: Mate that every program will solve...

Author: Paul

Date: 12:45:00 04/17/01

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On April 17, 2001 at 15:23:36, Paul wrote:

>On April 17, 2001 at 14:45:49, Tim Foden wrote:
>
>>On April 17, 2001 at 11:13:02, Heiner Marxen wrote:
>>
>>>On April 17, 2001 at 07:43:30, leonid wrote:
>>>
>>>>Hello!
>>>>
>>>>If you like to solve very "regular" mate position, then you have one.
>>>>
>>>>[D]R7/4P1Pq/1rR5/2pb1rnk/1Q3B2/4Nn2/1PB2Np1/2K1b1Q1 w - -
>>>>
>>>>Please, indicate your result.
>>>>
>>>>Thanks,
>>>>Leonid.
>>>
>>>According to Chest there are two key moves for mate in 7 moves:
>>>
>>>Qxg2 Bd2+ Qxd2   Bxc6 g8=Q   Qxg8  Rxg8   Bd5  e8=Q+  Bf7  Nxf5   Nd4  Rxg5#
>>>Rh8  Bd2+ Qxd2   Be4  e8=Q+  Rf7   Qxf7+  Nxf7 Qd5+   Bf5  Rxh7+  Nh6  Rhxh6#
>>
>>This is worrying to me, as Green Light thinks it finds another mate in 7, which
>>begins with e8=Q+
>>
>>As I understand it Chest finds all the mates, doesn't it?
>>
>>Here is a snippet of GLC's analysis (v2.14-pr7, hash 48M, Duron 880MHz):
>>
>>  8  26.25 320.983  16660k  Bd1 Bd2+ Qxd2 Rxc6 Qh2+ Kg6 e8=Q+ Bf7 Qxh7+ Kxh7
>>                              g8=Q+ Bxg8 Qxg8+ Kh6 Nxf5+ Kh5 Qxg5#
>>  8  51.62 320.987  38611k  e8=Q+ Bf7 Qxg2 Rxc6 Qg4+ Kg6 Qxf5+ Kh5 Qexf7+ Rg6
>>                              Qg4+ Kh6 Nf5# <ht>
>>  8  55.91 320.987  42689k  e8=Q+ Bf7 Qxg2 Rxc6 Qg4+ Kg6 Qxf5+ Kh5 Qexf7+ Rg6
>>                              Qg4+ Kh6 Nf5# <ht>
>>  9   1:00 320.987  47464k  e8=Q+ Bf7 Qxg2 Rxc6 Qg4+ Kg6 Qxf5+ Kh5 Qexf7+ Rg6
>>                              Qg4+ Kh6 Nf5# <ht>
>>  9   1:31 320.987  77248k  e8=Q+ Bf7 Qxg2 Rxc6 Qg4+ Kg6 Qxf5+ Kh5 Qexf7+ Rg6
>>                              Qg4+ Kh6 Nf5# <ht>
>> 10   1:51 320.987  96843k  e8=Q+ Bf7 Qxg2 Rxc6 Qg4+ Kg6 Qxf5+ Kh5 Qexf7+ Rg6
>>                              Qg4+ Kh6 Nf5# <ht>
>>
>>Cheers, Tim.
>
>I also found such a mate in 7, but not with a regular search, let's say in
>special mode:
>
>e8=Q+ Bf7 Qxg2 Bd2+ Qxd2 Rxf4 Qxf7+ Nxf7 Bg6+ Qxg6 Qxg6+ Kh4 Ng2#
>
>but since I really still do have a bug somewhere, I didn't dare posting it!
>Oh well ... now I've done it ... shoot, Heiner :)
>
>Groetjes,
>Paul

Forgot to say that the regular search found a mate in 8:

00:17 WM8 08 e8=Q+ Rf7 Qxg2 Bd2+ Qxd2 Rxc6 Qg4+ Kh6 Qh3+ Nh4 Qxh4+ Kxg7 Qxh7+
Nxh7 Qh8#

Paul



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