Author: leonid
Date: 10:12:22 04/17/01
Go up one level in this thread
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# > >(K7/600, 350MB hash, 9.3 minutes) > >Heiner Thanks, Heiner! My program demonstrate the worst possible branching factor for this position. Even for seeing the 6 moves by brute force it took already 38 min (Celeron 600. No hash). Only after your indication I went to see 7 moves by brute force. It took for mine hefly 1 hours 5 min. And this is after my last improvement that cut 6 moves brute force search already by 48%. Previously this position my solved by selective search in 10 moves. Leonid.
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