Author: Severi Salminen
Date: 13:35:43 03/02/01
Go up one level in this thread
>Easy -- the relative cost of a depth-reduced null-move search >at frontier nodes (with a remaining depth of 1 ply) is just >too high. Most normal searches from there also go straight into >quiescence mode and the gain of null-move cutoffs does not seem >to outweigh the added null-move search effort. Yes, this seems to be the case - has this been tested in even higher remaining depths (2,3...)?. Maybe in some situations your could turn null moves off at pre-frontier nodes also? After all, this would lead straight to qsearch? Maybe limiting null moves to levels where remaining depth after the depth reduction is at least 1 to allow any kind of move for opponent. I'll have to test this. I tested the version that disables when d==1 and got 0-10% reduction in the node count (only in a couple of positions...) so this seems to be a very good idea. Severi
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