Author: Mark Young
Date: 06:03:54 08/10/98
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On August 10, 1998 at 05:14:36, Robert Hyatt wrote: >On August 10, 1998 at 02:07:54, Mark Young wrote: > >>On August 09, 1998 at 23:09:20, blass uri wrote: >> >>>I know DB and Cray blitz use singular extensions (when one move is clearly >>>better than the others they analyze it more) and I have some questions >>>1) how much time do the programs analyze a move to decide it is singular. >>>Is it a function of the total time you give the program? >>> >>>2)what is exactly a singular move >>>(what is the minimal difference in evaluation between the best move and the >>>second best move to decide that a move is singular). >>> >>>3)In what lines do the programs use singular extensions? >>> >>>4)are there other programs who use singular extensions? >>> >>I had a test position that would test if a program used singular extensions. I >>lost the test position but remember that CM5000 could solve the position in less >>then 1 sec. meaning CM5000 used singular extensions. Other programs I tested >>could not solve the position at all. So they did not use singular extensions. If >>someone has this test position please post it. >>>Uri > > > >Actually a test position can't identify this. It might "suggest" that a program >does or doesn't use SE, but it can't prove it. The singular margin can be >different, on different engines, which will affect what gets extended and what >doesn't... some may only extend when material is being lost or won, while >others may extend on large positional score swings, etc. I don't think *any* >micro can do *full* singular extensions because it is quite expensive, which is >why a couple have tried just PV-singular extensions, or "deferred singular >extensions", to keep the cost contained... Thank you for the info. I also remember a version of the Chessmachine program had singular extensions. I remember an Update disk coming in the mail from inside chess. And the update letter saying this new version uses singular extensions. I did not find the new version stronger. And think the next update did not use it, but Ed should now for sure.
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