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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