From: Marco Costalba <mcostalba@gmail.com>
Date: Mon, 27 Jan 2014 06:36:26 +0000 (+0100)
Subject: Fix null reduction formula
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=f434cea287d3fae6b719816df0aa89a3d8579fa9;hp=f434cea287d3fae6b719816df0aa89a3d8579fa9

Fix null reduction formula

Depth is already dependent on the actual value
of ONE_PLY, in particular can be expressed like:

Depth = n * ONE_PLY

And because formula is used to calculate R that is
also dependent on the value of ONE_PLY and can be
expressed like:

R = x * ONE_PLY

We don't want to divide depth by a 'ply' value but
directly by an integer number.

Spotted by sf-x

No functional change.
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