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

Author: Steven J. Brann

Date: 15:39:56 04/17/01

Go up one level in this thread


On April 17, 2001 at 15:27:42, Dann Corbit 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>
>
>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#

Chessmaster sees it as Mate in 8 Also. Finds it in 1 second and sticks with it.

Time	Depth	Score	Positions	Moves
0:00	1/3	26.09	23914		1. e7-e8=Q+ Bd5-f7 2. Bc2xf5 Rb6xc6
					3. Bf5-g4+ Kh5-g6 4. Qe8xc6+ Ng5-e6
					5. g7-g8=Q+ Bf7xg8 6. Bg4xe6
0:01	1/4	Mate08	125961		1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#
0:03	2/5	Mate08	285059		1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#
0:12	2/6	Mate08	1244442		1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#
0:46	3/7	Mate08	4620988		1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#
2:46	3/8	Mate08	16637790	1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#
9:16	4/9	Mate08	56125900	1. e7-e8=Q+ Bd5-f7 2. Qg1xg2 Be1-d2+
					3. Qb4xd2 Rb6xc6 4. Qg2-g4+ Kh5-g6
					5. Qg4xf5+ Kg6-h5 6. Qe8xf7+ Rc6-g6
					7. Qf5-g4+ Kh5-h6 8. Ne3-f5#

Steve



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