Author: Heiner Marxen
Date: 13:18:19 04/18/00
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On April 18, 2000 at 14:56:45, blass uri wrote: >On April 18, 2000 at 14:29:28, Heiner Marxen wrote: > >>On April 17, 2000 at 16:57:57, Dann Corbit wrote: >> >>>In this message: >>>http://f11.parsimony.net/forum16635/messages/3512.htm >>>James Swinney gives this position: >>>[D]6bn/2k2prq/5prp/5pbn/5p1p/1Kp2PpP/2P3P1/8 w - - 0 1 >>> >>>Q: >>>Do any programs spot the win? Crafty only sees a draw out to 10 minutes worth >>>of analysis. >> >>After nearly 44 hours Chest finds that there is no mate in 23 (K7/600 350MB). >>I'm not sure whether I will wait until the mate is found. But it cannot >>be very far away, now, since in the last depth Chest slowed down considerably. >> >>A forced mate of not minimal depth should be in the reach of programs, >>I would expect. What does crafty say, when the disfunctional black pieces >>are deleted, and without any EGTB files? Does it find that mate? >> >>Heiner > >I am not sure if there is a win for white because black can try to win the pawn >g2 when white tries to queen the pawn. Yes. you are right, of course. That is a potential complication. >Maybe there is a win but it is not so simple that I can say without thinking >that there is a mate and it as not important for me to analyze an illegal >position. Ok, I understand that it is not important for you (you said so in another posting also). For me this is a bit different. Technically, this position _is_ illegal, ok. But I consider this a minor deficit, here. I expect a similar legal position to be constructible, but are to lazy to do that. And the idea seems to be quite clear. >I think that it is better to be convinced that white can win against logical >defence before giving your program a lot of hours to find if there is a mate. Again, my position is different. Just now I do not have the time to analyze this position myself. But I have the time to start Chest on my idle PC, and watch its protocol from time to time. Of course, this is also a test for my program: I'm interested what it can do and what it cannot do. I like to try tough and/or crazy positions. BTW, I do expect a forced mate to be possible. >Uri Heiner
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