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No influence on unsafeSquares of passers by pieces

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Remove their pieces from influencing 'unsafeSquares' in passer
evaluation.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 36421 W: 8170 L: 8078 D: 20173
http://tests.stockfishchess.org/tests/view/5d22fc8e0ebc5925cf0cb26e

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 18927 W: 3253 L: 3129 D: 12545
http://tests.stockfishchess.org/tests/view/5d26e2b20ebc5925cf0d3218

Closes https://github.com/official-stockfish/Stockfish/pull/2248

Bench: 3285659
This commit is contained in:
Lolligerhans 2019-07-16 10:14:09 +02:00 • committed by Stéphane Nicolet
parent 19509e5f13
commit fd96cba676
1 changed files with 1 additions and 1 deletions
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2
src/evaluate.cpp
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@ -641,7 +641,7 @@ namespace {
bb = forward_file_bb(Them, s) & pos.pieces(ROOK, QUEEN);
if (!(pos.pieces(Them) & bb))
unsafeSquares &= attackedBy[Them][ALL_PIECES] | pos.pieces(Them);
unsafeSquares &= attackedBy[Them][ALL_PIECES];
// If there are no enemy attacks on passed pawn span, assign a big bonus.
// Otherwise assign a smaller bonus if the path to queen is not attacked