Author: Ricardo Gibert
Date: 11:23:31 12/27/00
Go up one level in this thread
On December 27, 2000 at 14:21:39, Ricardo Gibert wrote: >On December 27, 2000 at 09:51:20, Gian-Carlo Pascutto wrote: > >>On December 27, 2000 at 09:24:18, Åge Trulssen wrote: >> >>>White:Ka3, Nc8, g5 Black:Kg8, g7, e3 >>>White to move and get a draw >>> >>> Å.T. >> >>[D]2N3k1/6p1/8/6P1/8/K3p3/8/8 w >> >>Ne7+ Kh7 g6+ Kh8 Kb4 e2 Kc5 e1=Q Kd6 draw >> >>[D]7k/4N1p1/3K2P1/8/8/8/8/4q3 b >> >>Black cannot win white's knight because his king is trapped. >> >>Crafty finds this very fast but will not realize it is a draw. >>I don't think any program will, unless it has a heuristic that >>says 'must make progress if ahead'. Or you have 6 man tablebases. (or maybe >>5 too...I don't have those). Maybe if you can see the 50move rule >>you can see the draw too. >> >>Just by watching at the PV it spits out it's obvious that it's >>a draw: >> >>depth=29 -5.93 5. ... Qe4 6. Kd7 Qe5 7. Ke8 Qd4 8. Kf7 Qc4+ 9. Ke8 Qe6 10. Kf8 >>Qf6+ 11. Ke8 Qd6 12. Kf8 Qa6 13. Kf7 Qa2+ 14. Ke8 Qa4+ 15. Kf7 Qb3+ 16. Ke8 Qd3 >>17. Kf7 Qd1 18. Ke8 Qg1 19. Kf7 Qe1 20. Kf8 Qe4 21. Kf7 Qf4+ 22. Ke8 Qe4 >> >>-- >>GCP > >Crafty "finds" the solution, because no sacrifice is involved and other >continuations are even more pathetic. Gambit tiger also "solves" this in under a >second. An old favorite that does not suffer from the same defect and is similar >in motif is: > [D]7r/p3k3/2p5/1pPp4/3P4/PP4P1/3P1PB1/2K5 w - - 0 0 > >1.Kd1 Rh2 2.Ke1 Rxg2 3.Kf1 Rh2 4.Kg1 Rh3 5.Kg2 Rh6 6.f3 and since the White King >prevents entry by the rook along the h-file by shuttling his king between g1 and >g2 and it can prevent the rooks entry along the e-file by shuttling his King >between f2 and f1 and finally, there is no progress to be made on the q-side, so >the position is a draw. A study by Chekover. > >[D]8/p3k3/2p4r/1pPp4/3P4/PP3PP1/3P2K1/8 b - - 0 0
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