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

Author: Dann Corbit

Date: 12:27:42 04/17/01

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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>

Crafty likes e8=Q+ and sees a mate in 8.  I strongly suspect that there is no
mate in 7 for e8=Q+, since I have never seen Chest miss any before.

8     7:26  Mat08   1. e8=Q+ Bf7 2. Bxf5 Rxc6 3. Bg4+ Kg6
                    4. Qbe4+ Nxe4 5. Bf5+ Kh5 6. Qxf7+
                    Rg6 7. Bg4+ Kh4 8. Nxg2#
8->   9:42  Mat08   1. e8=Q+ Bf7 2. Bxf5 Rxc6 3. Bg4+ Kg6
                    4. Qbe4+ Nxe4 5. Bf5+ Kh5 6. Qxf7+
                    Rg6 7. Bg4+ Kh4 8. Nxg2#



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