Author: Heiner Marxen
Date: 19:42:15 01/03/02
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On January 03, 2002 at 01:05:14, Jouni Uski wrote: >[D]k7/P7/P7/P7/P7/P7/P7/R3K3 w Q - 0 1 > >Mate in 8 > >I tried this at home with Tiger14 and Fritz7 and Shredder5.32. None of them has >any idea about mate in 8. Then I tried with Mate2.1, but no solution under 30 >minutes. What's the problem? Only Yace gives CORRECT mate in few seconds. Is >this null move problem? > >Jouni As already mentioned in Tim Krabbe's web page, there are 2 solutions. Chest on a K7/600 needs only 6.71 seconds to find them. With 4-piece table bases it is only a little faster: 6.60 seconds: PV: Kd2 Kxa7 Re1 Ka8 Re8+ Ka7 Kc3 Kxa6 Re7 Kxa5 Re6 Kxa4 Re5 Kxa3 Ra5# PV: O-O-O Kxa7 Rd8 Kxa6 Rd7 Kxa5 Rd6 Kxa4 Rd5 Kxa3 Rd4 Kxa2 Rd3 Ka1 Ra3# Cheers, Heiner
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