R * Moves * Expands * PVS(ProbeDepth)
Moves = average moves in the position.
R = ratio (average probes per moves from 1 to 2 ) ~1.5
Expands = number of expands
(BranchFactor ^ PlyEquiv) * PVS(ProbeDepth)
R * Moves * Expands <=> BranchFactor ^ PlyEquiv
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