official-stockfish/Stockfish — pull request #56 by mcostalba (2014-09-29 14:06:54+00:00)
Title: Move ONE_PLY to be 1 instead of 2: search()

Now that half-plies are no more used we can simplify
the code assuming that ONE_PLY is 1 and no more 2.

Verified with a SMP test:
LLR: 2.95 (-2.94,2.94) [-4.50,0.00]
Total: 8926 W: 1712 L: 1607 D: 5607

No functional change.