Null-move Heuristic - Verified Null-move Pruning

Another heuristic for dealing with the zugzwang problem is Omid David and Nathan Netanyahu's verified null-move pruning. In verified null-move pruning, whenever the shallow null-move search indicates a fail-high, instead of cutting off the search from the current node, the search is continued with reduced depth.

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    Don Pedro. Officers, what offence have these men done?
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    William Shakespeare (1564–1616)