Author: leonid
Date: 10:21:20 02/24/01
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On February 24, 2001 at 12:32:37, Heiner Marxen wrote: >On February 24, 2001 at 08:55:41, leonid wrote: > >>Hi! >> >>If you like to solve one mate that give some impression of tension but your >>program will solve more easely that you personally expect, try this one: >> >>[D]4bB2/n1NQq1b1/1Q2Q3/1q2Q1q1/rqn4R/kq2QQqQ/rnQn2R1/N1Qq1B1K w - - >> >>Please, indicate your result. >> >>Don't forget to mention your program and your hardware. >> >>Thanks, >>Leonid. > >In 24 minutes on a K7/600 (350 MB hash) Chest finds 4 solutions in 7 moves: > >Nxb5+ Nxb5 Qexb3+ Nxb3 Qcxb3+ Qbxb3 Bxe7+ Qxe7 Qexe7+ Nbd6 Qe7d6+ Nxd6 Rxa4# >Qcxb3+ Nxb3 Nxb5+ Nxb5 Qxb3+ Qbxb3 Bxe7+ Qxe7 Qexe7+ Nbd6 Qe7d6+ Nxd6 Rxa4# >Qexb3+ Nxb3 Nxb5+ Nxb5 Qcxb3+ Qbxb3 Bxe7+ Qxe7 Qexe7+ Nbd6 Qe7d6+ Nxd6 Rxa4# >Bxe7 Qgxe3 Qfxd1 Bg6 Qbxe3 Q5c5 Q2xb2+ Nxb2 Qdxb3+ Nxb3 Q6xb3+ Qxb3 Rxa4# > >The last one is surprisingly "quiet". > >Heiner Thanks, Heiner! I found only three and stopped waiting any more. Needed my computer, after searching this position for 1 hour by brute force. Last solution should be very close after banching factor. Was almost sure that there are no more mate inside. You came with four solutions. First mate by selective was very quick. Brute force still reasonable - 3 min 31 sec. This is why I looked on this position as "just right" for solving. Leonid.
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