Author: James Swafford
Date: 20:26:29 09/15/99
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On September 15, 1999 at 17:12:16, Dan Homan wrote: I've never really understood the importance of root ordering. If you resort the move list after every ply, then the (initial) root ordering is useless after the first iteration. -- James >I was reading the crafty source again the other day and noticed that >Bob has a special function to improve the move ordering at the root >of the search. > >I really didn't feel like writing such a function last night, but I >thought instead to use the values returned by the search itself to >improve the move ordering at the root. I know that I only get an >accurate value for the best move, but I thought that my fail-soft >search might return useful numbers for the other moves as well.... > >Implementing this was pretty quick and easy: there were a couple >of pit falls, but the total changes were about 5 lines of code. >Previously I simply used the same move ordering at the root that I >use at all other nodes. > >The improvement was amazing! I got a full ply in many positions and >about a half-ply in many more. It improved my solution times on WAC >noticably and seems even better in quiet positions. > >I know that my solution was a quick kludge, so I am wondering what >other people do for move ordering at the root of the search. > > - Dan
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