Author: Ed Schröder
Date: 00:01:54 01/27/01
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On January 26, 2001 at 14:21:27, Tord Romstad wrote: >On January 25, 2001 at 15:32:39, Ed Schröder wrote: > >>On January 25, 2001 at 14:00:38, Tord Romstad wrote: >> >>>On January 25, 2001 at 13:15:59, Ed Schröder wrote: >>> >>>>The goal of null-move is to lower the (current) depth with X-plies, in >>>>CC terms called R=X. Most common is R=2. "R" stands for reduce. >>>> >>>>Of course you don't have to do a null-move to practise a R=2. In Rebel >>>>I do R=1, R=2 and complete razoring (R=INFINITE) based on eval and some >>>>special code not to prune / reduce important parts of the tree. >>> >>>Do you use R=INFINITE for particularly bad-looking moves everywhere in the >>>tree, or just near the leaves? It seems very dangerous to do this near the >>>root of the tree ... >> >>There is an absolute minimum depth. At the early iterations Rebel might prune >>on ply 1 but not on deeper iterations. Still it easily might happen being on >>iteration 11 the tree is pruned at ply 3 or 4 but then it is fully justified. > >My old version of Rebel for the ChessMachine card shows the search depth >as two numbers, separated by a slash. In the middle game, the search >depths at successive iterations are typically something like 2/4, 2/5, >3/6, 3/7, 3/8 and 4/9. Does a search depth like 4/9 mean that the type >of pruning you describe would not be applied during the first four plies? > >Tord For the ChessMachine 4/9 meant: "9" current iteration "4" brute force depth In the current Rebel this is not longer true. Ed
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