Author: Dann Corbit
Date: 12:27:42 04/17/01
Go up one level in this thread
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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