Author: Dieter Buerssner
Date: 16:22:31 03/14/04
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On March 14, 2004 at 15:08:12, Steven Edwards wrote: >On March 14, 2004 at 14:28:36, John Merlino wrote: > >>On March 14, 2004 at 13:13:18, Art Basham wrote: >> >>>7B/6N1/8/5B2/8/K7/pr6/k7 w - - 0 1 >How about mate in 26: > >1. Ka4 Rh2 2. Nh5+ Rb2 3. Nf6 Rb8 4. Bg7 Ra8+ 5. Kb3 Ra3+ 6. Kc2 Rc3+ 7. Kd2 >Kb2 8. Nd5 a1=Q 9. Bxc3+ Ka2 10. Nb4+ Kb3 11. Be6+ Ka4 12. Bxa1 Kxb4 13. Bd4 >Kb5 14. Bd5 Kb4 15. Bb7 Ka5 16. Ba7 Ka4 17. Ba6 Ka5 18. Bd3 Ka4 19. Bc5 Ka5 20. >Kc3 Ka4 21. Bb6 Ka3 22. Bb5 Ka2 23. Kc2 Ka1 24. Ba4 Ka2 25. Bb3+ Ka1 26. Bd4# Do you find a mate in (at most) the 26th move, too after 3...Rh2 instead of Rb8? With the help of a little backwards analysis, I get the following in Yace: After 3...Rb8: 14.22 0:00 +M23 4.Bg7 Ra8+ 5.Kb3 Ra3+ 6.Kc2 Rc3+ 7.Kd2 Kb2 8.Nd5 (308) 23.6 (Mate at move 26) After 3...Rh2: 15.01 0:00 +M26 4.Bg7 Rc2 5.Nd7+ Kb1 6.Kb3 a1N+ 7.Bxa1 Kxa1 8.Kxc2 Ka2 (664) 110.6 (Mate at move 29) Going further back to the root: 15.01 0:00 +M29 1.Ka4 Rh2 2.Nh5+ Rb2 3.Nf6 Rh2 4.Bg7 Rc2 5.Nd7+ Kb1 6.Kb3 a1N+ 7.Bxa1 Kxa1 8.Kxc2 Ka2 (211) 4.7 which can be considered as a proof, that white has a forced mate in 29 or faster (or as a proof of a bug in my engine ...). Regards, Dieter
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