Author: Uri Blass
Date: 11:47:42 01/30/02
Go up one level in this thread
On January 30, 2002 at 14:43:19, Dann Corbit wrote: >On January 30, 2002 at 14:39:04, Uri Blass wrote: >>On January 30, 2002 at 14:15:32, Dann Corbit wrote: >>>On January 30, 2002 at 14:00:32, David Rasmussen wrote: >>> >>>>On January 30, 2002 at 09:43:49, Vincent Diepeveen wrote: >>>> >>>>I don't know anything about what Bob has stated, but I agree that 18 ply >>>>fullwidth was/is impossible, even with 200 Mn/s. >>>> >>>>Please email me how you do singular extensions, Vincent. :) >>> >>>I've done 18 ply searches with a PC. What makes you think it is impossible for >>>a machine that can peak at one billion nodes per second? >>> >>>They did not use null move, but neither did they blindly search the whole tree. >> >> >>I suggest that you try to do with Crafty without null move pruning 18 ply search >>in the same positions that deeper blue was supposed to search 18 plies. >> >>Note that Crafty without null move pruning does not search all the tree. >> >>I am interested to know how many nodes do you need. >> >>you can claim that they had more hash tables so try to search 16 plies and guess >>the number of relevant nodes based on the branching factor. >> >>If you think that deeper blue used more hash tables then please search 16 plies >>twice when the hash tables is twice bigger in the second time(I think that >>doubling the hash tables from 128 Mbytes to 256 Mbytes is not going to change >>the time significantly) >> >>If Crafty without null move pruning cannot search 18 plies in similiar number of >>nodes then I do not believe that deeper blue that is supposed to use more >>extensions could do it. > >Null move is not the only way to reduce the tree. Did you know that Rebel did >not use null move for some time? How do you imagine that it remained >competitive? Obviously, by pruning the tree in some other way. Yes but I understood that Deeper blue did not use pruning except maybe qsearch and most of the nodes in the tree are not qsearch nodes. Uri
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