Author: Thorsten Czub
Date: 02:15:16 03/30/03
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On March 30, 2003 at 04:56:44, Werner Schuele wrote: >Hi Ed, >beta 2, 3 and 4 use this option, not beta1 >Whats the default? >What happens with [Pruning = PRUNE BAD MOVES_0] ? >Beta1 does find more traps! >Werner see http://www.thorstenczub.de/rebelxp4.html >>[Pruning = PRUNE BAD MOVES_2] * Reduction depth status: not tested yet >the higher the number the MORE pruning ? In chess programs besides "extentions" you also have the opposite technique "reductions". With extensions you increase the search depth because you have something interesting and want it to search deeper, reductions do the opposite, you lower the search depth because a move (position) is so bad or so good it makes no sense to search to the full (iteration) depth, the most known example of reductions is null-move. Rebel has lots of other "reduction" stuff, the PRUNE BAD MOVES parameter is a misleading text as it in reality sets the maximum of allowed reductions. Allowed values are: 0-8, default is 8. Interesting to test would be 0, 1 and 2. -------- IMO the reduction switch shows that rebel is not overseing things because of selective 100 but because reduction (in beta1) is 8 instead of 2, or even NO reductions = 0.
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