Author: Robert Hyatt
Date: 06:32:40 01/17/00
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On January 17, 2000 at 03:11:34, Jouni Uski wrote: >Yes stunnigly they are available at: > >http://www.research.ibm.com/deepblue/watch/html/c.html > >First thing I notice is, that search depth is not very convincing at all - >mostly 11-12 ply (also in endgame part)! Have I read log wrong way? Most >Chessbase engines got same ply in standard PC... > >Jouni It is a "different" kind of ply. DB didn't use null-move of any kind. They also used singular extensions which cause the typical chess ram to search 1-2 plies less deep in the typical case, although it will probe much deeper in the traditional sense. One other unknown is whether their 10 plies includes the 4 plies of hardware search. They don't count total nodes that I noticed anywhere, so it isn't easy to decide. For me, 1M nodes per second gives a depth of 13-14 in the middlegame. Going 200M should drive that to roughly log3(200) which is about 5 plies deeper. So call that 18-19 plies. Removing null-move would subtract 2, so 16-17 plies. Singular extensions 1-2 more plies, so that would be (14-15) to (15-16) plies. Somewhere on their web site they mentioned 14 plies as "normal". So their iteration number might be slightly different from "ours". IE when I search until depth is reduced to zero, I go to the quiescence search. They might go to their hardware, which is not exactly a "quiescence search" since it looks at all moves for 4 plies, but doesn't do any of the singular stuff and so forth. I'll try to ask next time I hear something from Hsu.
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