Author: Robert Hyatt
Date: 18:47:48 12/21/00
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On December 21, 2000 at 16:40:26, Brian Richardson wrote: >What are the pro's and con's of doing null moves "at the root", e.g. after a ply >1 move and then another null move by the same side. It seems to help >dramatically in some tactical situiations, but not others. Thus far, Tinker has >only used null moves starting at ply 2 (actually ply 3) moves, e.g, Tinker makes >a move, then opponent replies, then another null move reply. > >Thanks >Brian > >PS One example of it helping is BT2630.03 >5r1k/p1q2pp1/1pb4p/n3R1NQ/7P/3B1P2/2P3P1/7K w - - bm e5e6 That isn't "at the root". Ply=1 is the root. and trying a null-move there is useless... it can't cause any cutoffs since you are not searching anything before the null-move, and since you can't legally play a null-move, searching it gives you no information. At ply=2, trying a null-move is perfectly normal. This means that you make two consecutive moves by the same side... which is what null-move is all about.
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