Author: Heiner Marxen
Date: 14:15:16 01/29/01
Go up one level in this thread
On January 29, 2001 at 11:45:27, leonid wrote: >On January 29, 2001 at 08:17:16, Paul wrote: > >>On January 29, 2001 at 06:44:48, leonid wrote: >> >>>Hi! >>> >>>If you would like to solve one "average" mate position, here you have one. >>> >>>[D]1rQbkrQn/2qnrnqB/1Bbqbqn1/1N2Q2N/2N1n1NQ/3Q1Q2/3RQR2/4K3 w - - >>> >>>Please indicate your result. >>> >>>If you happened to have one forced mate position from real chess competition >>>(human player), please indicate it here. If you will do this, try not forget to >>>to say by who it was played. >>> >>>Thanks, >>>Leonid. > >Hi, Paul! > >I went to see this position in 8 moves. Mate really existe in 8, like you said, >and mine moved: White Knight B5-D6. I have no idea about 7 moves. See 7 moves by >brute force can take very long time for my program. When I solved position with >selective search for 8, it already took 6 min 41 sec. Brute force for 7 can take >easely few hours. > >Greetings from Montreal, >Leonid. Yes, that one is a bit tough. Chest used 3.1 hours on a K6-3/400 with 60MB hash, but managed to find a mate in 7. Four mates to be exact: Ncxd6+ Qxd6 Qhxf6 Qxg8 Nc7+ Qxc7 Qxe7+ Kxe7 Qff6+ Ke8 Qfxe6+ Ne7 Qxe7# Ngxf6+ Qxf6 Qxg6 Qxg6 Ncxd6+ Qxd6 Nxd6+ Nexd6 Ng7+ Qxg7 Qxe7+ Kxe7 Qxe6# Qfxf6 Rxg8 Ncxd6+ Qxd6 Qxg7 Rxg7 Nxd6+ Nexd6 Qxg7 Bxg4 Qg8+ Ndf8 Nf6# Qhxf6 Rxg8 Ncxd6+ Qxd6 Qxg7 Rxg7 Qxg7 Nfe5 Nhf6+ Ndxf6 Nxf6+ Nxf6 Nxd6# >>Believe me, I tried to resist ... but just can't :) >> >>Leonid, mine found a Mate in 8: >> >>04:19 WM8 08 1. Ncxd6+ Qxd6 2. Nxd6+ Nfxd6 3. Ngxf6+ Qxf6 4. Qfxf6 Rxg8 5. Qxe7+ >>Nxe7 6. Qxe7+ Kxe7 7. Qxe6+ Kxe6 8. Qxd6x >> >>Still grateful to the guy who invented EPD. >> >>Greetings, >>:Paul Sorry, Paul... I also couldn't resist ;-) Heiner
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