Author: Heiner Marxen
Date: 15:27:16 02/22/01
Go up one level in this thread
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
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