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This is a non-functional simplification/speedup. The truth-table for popcount(support) >= popcount(lever) - 1 is: ------------------lever ------------------0-------1---------2 support--0------X-------X---------0 -----------1------X-------X---------X -----------2------X-------X---------X Thus, it is functionally equivalent to just do: support || !more_than_one(lever) which removes the expensive popcounts and the -1. Result of 20 runs: base (...h_master.exe) = 1451680 +/- 8202 test (./stockfish ) = 1454781 +/- 8604 diff = +3101 +/- 931 STC LLR: 2.94 (-2.94,2.94) [-3.00,1.00] Total: 35424 W: 7768 L: 7674 D: 19982 Http://tests.stockfishchess.org/tests/view/5c970f170ebc5925cfff5e28 No functional change.
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