Author: Jeremiah Penery
Date: 00:58:32 04/02/00
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On April 01, 2000 at 10:02:38, Laurence Chen wrote: >On March 31, 2000 at 02:29:31, Jeremiah Penery wrote: > >>This position came from Valentin Albillo's site, on one of the endgame pages. >> >>In this position: >> >>[D]8/8/8/8/3p4/2k1p3/2N1P3/3K4 w - - >> >>White is supposed to capture the first black pawn on ply 39 (move 20), and the >>second one shortly after. I ran my modified Crafty on this with all 5-man TBs >>to a depth of 45, with some strange results: >> >>White(1): 8/8/8/8/3p4/2k1p3/2N1P3/3K4/ w <SNIP> >>I'm wondering if someone with a faster machine, with more memory (for TB cache, >>primarily - my HD was going nuts, practically grinding my whole machine to a >>halt) could run this until it sees mate. I'd like to know how far out it is. :) >> >>Thanks, >>Jeremiah >I think that White can mate in 40 moves. >1. Ne1 Kb2 2. Nd3+ Kc3 3. Nc1 Kb2 4. Na2 Kb1 5. Nb4 Kb2 6. Nd5 Kb3 7. Nc7 Kc3 >8. Nb5+ Kc4 9. Nd6+ Kb3 10. Ne4 Kb2 11. Nc5 Kc3 12. Ke1 Kb2 13. Kf1 Kc2 14. Kg2 >Kd2 15. Kf3 Kc2 16. Nd3 Kc3 17. Ne5 Kb3 18. Ng4 Kc4 19. Nxe3+ dxe3 20. Kxe3 1-0 >and using tablebases it announces mate in 20. >Laurence I think white can mate in 39 moves, but I'm not sure if it's 100% optimal, since I took the first 12 moves (24 ply) of the above variation, as it's where Crafty and Hiarcs agreed. I'm not sure these first 24 ply are totally correct, though. The next few moves of Hiarcs were equal to the optimal move, but move 17. ...Kb3 is suboptimal by 2 moves. It allows mate in 20, where 17. ...Kc2 allows mate in 22. Down the main line, after 17. ...Kc2, we have: 18. Nc4 Kc3 19. Nxe3 d3 20. Nd5 Kd4! 21. e4! Ke5 22. Ne3 Kd6 23. Kf4! Ke6! 24. Nc4 Kf6! 25. e5+! Ke6! 26. Ke4! Ke7 27. Kf5 Kd7 28. e6+! Ke7 29. Ke5! Kd8 30. Kd6! Ke8 31. e7! d2! 32. Nxd2! Kf7! 33. Ne4 Kg6 34. e8=Q+ Kf5! 35. Qe5+ Kg4! 36. Qf6 Kh3! 37. Qg7 Kh2 38. Qg3+! Kh1! 39. Nf2#! (exclamations given to the only 'optimal' move in that position.) Jeremiah
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