Author: blass uri
Date: 06:40:13 04/19/00
Go up one level in this thread
On April 18, 2000 at 16:18:19, Heiner Marxen wrote: >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. I expect a forced mate to be impossible because tablebases say mate in 21 if I delete all the pieces except the relevant white and black pawns when chest found that there is no mate in 23 with all the pieces. Uri
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