Author: leonid
Date: 15:13:00 05/05/01
Go up one level in this thread
On May 05, 2001 at 17:47:38, Heiner Marxen wrote: >On May 05, 2001 at 12:41:18, Paul wrote: > >>On May 05, 2001 at 11:55:58, leonid wrote: >> >>>Hello! >>> >>>If you would like to solve very easy mate, you can do this by solving one >>>position from two, or both. >>> >>>[D]qk1r4/bpp1R1p1/pB1pnp2/N1Nb3p/2P1P3/QRnP2PB/5PK1/1r6 w - - >> >>Hi Leonid, >> >>this one is instantly solved by Pretz as a mate in 9: >> >>00:00 WM9 07 Nc6+ Bxc6 Nxa6+ bxa6 Bxc7+ Kc8 Qxa6+ Qb7 Bxe6+ Rd7 Bxd7+ Kxc7 Bxc6+ >>Kc8 Qxb7+ Kd8 Re8# > >As always, Pretz is faster than Chest. As often, Pretz in fact finds the >shortest possible mate. I'm impressed, really! I completely agree with you! His program somehow did exactly like mine for both positions in number of moves that lead to mate by selective search. I solved two of them by selective and expected that you will come with minimum moves to fix it for all of us. I could see that both have very bad branching factor. I will come by curiosity to see how professional program do on these positions. Recently, I could see that one program had better branching factor that mine on one position that look like "natural". In reality, all my positions is simple fantasy. Cheers, Leonid. >1.Nc6+ is the only key for mate in 9. Without duals this is a complete >solution tree: > > Nc6+ Bxc6 Nxa6+ bxa6 Bxc7+ Kc8 Qxa6+ Qb7 Bxe6+ Rd7 Bxd7+ Kxc7 Bxc6+ Kc8 Bxb7+ >=*= Qxd6# > Kd8 Re8+ >Kc7 Qxb7# > Kb8 Qxb7# > Bxd7 Qxb7# > Bd7 Qxb7# > Bb7 Bxe6+ Rd7 Bxd7+ Kxc7 Be6+ =*= Qxd6# > Kc8 Rxc7# > bxc6 Bxc7+ Kc8 Qxa6+ Qb7 Qxb7# > Kc8 Rxc7# > >Took 48.1 minutes on K7/600 with 350 MB, so it wasn't exactly "easy" for Chest. > >>>[D]3k4/b2r4/4q3/2q3n1/1nnNbqnN/1Q1qpNBQ/r1BPQPp1/qNQRKR1N b - - >> >>And this one took a while longer as usual with your creations :), mate in 8: >> >>01:22 BM8 07 exf2+ Nxf2 Qaxd4 Bxd3 Qxf2+ Bxf2 Qxf2+ Rxf2 Bxf2+ Qxf2 Bxd3+ Qe3 >>g1=Q+ Nxg1 Qf2# >> >>Greetings, >>Paul > >Oh yes, this one is harder. Up to now I know that there is no mate in 6 >(471 secs), and the effective branching factor appears to be above 20. >Therefore I estimate well over 2 days for the mate in 8 to complete. >I think I will let him do it. OTOH, within these two days Leonid will >come up with at least two more of these ;-) Such is life. > >Groetjes, >Heiner
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