Author: Robert Hyatt
Date: 20:47:16 08/26/00
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On August 26, 2000 at 20:01:16, Sylvain Renard wrote: >On August 26, 2000 at 05:22:00, Joshua Lee wrote: > >>For some strange reason it doesn't mate like it says it will in a Krp VS Kr. >>The position is W: Kg8, Rf3, Pg7 >>B: Ke7,Rh1 Black to move this is what happens....... >> >>1...Rh2#21 2.Rf4 #21 Rh3 #20 >>3. Re4+ #20 Kd6 #19 4. Kf7 #19 Rf3+#18 >>5. Kg6 #18 Rc3 #17 6. Rg4 #17 Rc8 #16 >>7. Kf6 #16 Rg8 #15 8. Rg5 #15 Re8 #14 >>9. Rg6 #16 Kd5 #15 10. Rg4+ #16 Kc4 >>11. Rg4+ #16 Kc5 #15 12. Rg5+ Kc4 #15 >>13. Rg4+#16 Kc5 #15 14. Rg5+ #16 Kc4 0.00 1/2-1/2 >> >>even with the small tbs file it still does the same thing....Thankyou > > Hello, >You had an excellent answer from Uri. >It is a well known problem. Most of the time, the files kqrvkr >will be sufficient. But in some rare positions, an underpromotion >is the only move get closer of mate. >So the only way to avoid theses problems is to have _all_ 5 pieces >files! > Best regards, > Sylvain Or use the approach used in Crafty, which solves this problem easily.
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