Author: leonid
Date: 17:43:13 02/22/01
Go up one level in this thread
On February 22, 2001 at 18:27:16, Heiner Marxen wrote: >On February 22, 2001 at 17:04:16, leonid wrote: > >>On February 22, 2001 at 16:37:31, leonid wrote: >> >>>On February 22, 2001 at 09:51:57, Ricardo Gibert wrote: >>> >>>>On February 22, 2001 at 08:03:25, leonid wrote: >>>> >>>>>Hi! >>>>> >>>>>If you like to solve one very easy mate then this is right position: >>>>> >>>>>[D]1b2nQrk/2Q3qn/1q1q2Q1/1Q1N1nq1/b1qQqN1q/1BB1qQ2/1qQ4Q/3K4 w - - >>>>> >>>>>Please indicate your result. >>>>> >>>>>Thanks, >>>>>Leonid. >>>> >>>>Compose one similar to this that ends in a forced stalemate after a dozen moves, >>>>then I will really be impressed! >>> >>>Maybe you will be impressed but then it will be difficult for computer to solve >>>new position by brute force. This position is very short one and can be easely >>>solved by brute force. Reason - branching factor (even if position is impressive >>>with 9 queens) is very moderate. Good position is the position that contain some >>>need for search but where solution is not that far. >>> >>>Leonid. >> >>After this message, I went to my position to find it what time it could be >>solved by brute force. On AMD 400Mhz computer it was: >> >>4 moves - 0.6 sec - no solution >>5 moves - 3.8 sec - no solution >>6 moves - 25 sec - no solution >>7 moves - 3.8 sec - solution found >> >>Selective search take this position in 0.055 sec. >> >>Now you can see why I have said that position is easy. Try to solve it with >>every solid program (like Chess Master or Heiner's solver) and you will see that >>I was right. >> >>Many pieces on the board are very often to give some animation to it but not >>necessarily to make position complex. >> >>Leonid. > >Are you sure the position is correct? Chest gives a mate in 4: > > Qxg8+ Kxg8 Qbxe8+ =*= Qdxg7+ Nxg7 Qcxg7# > >As far as I can see that is correct. >(0.21 secs, K7/600) > >Heiner Thanks for saying me this! I went back to my position and verified it against position printed from Chess Club. Position here is right. It should be mate in 7. Verify once again if you took correct position from here. It could be nothing but this. If somehow my program is wrong, your finding is very important for me. Only now I can do nothing. Don't have any time to verify with other programs in order of seeing their responses. I was today too busy and expect tomorrow it will be the same for me. Only at Saturday will be able to see something on my own. If you will try this position before me, with some other programs, please make me know what you found. Thanks, Heiner, for your help! Leonid.
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