Author: blass uri
Date: 23:32:32 08/09/98
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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. There are positions when progrmas have to calculate a move for some seconds or some minutes to discover that the move is singular. A good example for this is the 7th game Rebel-Anand after the line 33...Qe6 34.Bc6 Rc3 35.bxc3 Qc4 36.Bb2 Qxf1+ 37.Qc1 all the programs I know after many hours do the mistakes: 37...Qxc1+?(Rxb2 or Bxc3 is winning) 38.Bxc1 Rb1+?(Bxc3+ is a better move) 39.Kxa2 Rxc1 40.cxd4 Rxc6 41.d7 Ra6+ 42.Kb3 Rb6+ 43.Kc4 Rb8 (all the moves in this line are singular because the difference between the best and the second best move after some minutes is more than a pawn) and white is winning after 44.Kc5 The question is if CM5000 use singular extensions of these moves in correspondence chess or use singular extensions only in cases it discovers in a very short time that a move is singular. Uri >>Uri
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