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Simplify a candidate passer condition.

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STC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 31528 W: 6208 L: 6061 D: 19259
Ptnml(0-2): 541, 3673, 7205, 3788, 557
https://tests.stockfishchess.org/tests/view/5e825db0e42a5c3b3ca2ee21

LTC:
LLR: 2.94 (-2.94,2.94) {-1.50,0.50}
Total: 38546 W: 5083 L: 5009 D: 28454
Ptnml(0-2): 299, 3628, 11362, 3668, 316
https://tests.stockfishchess.org/tests/view/5e826ec7e42a5c3b3ca2ee2a

closes https://github.com/official-stockfish/Stockfish/pull/2607

Bench: 5139561
This commit is contained in:
31m059 2020-03-30 21:53:02 -04:00 • committed by Joost VandeVondele
parent 84f3bf594d
commit 375e4eeaf5
1 changed files with 2 additions and 3 deletions
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5
src/evaluate.cpp
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@ -639,9 +639,8 @@ namespace {
} // r > RANK_3 } // r > RANK_3
// Scale down bonus for candidate passers which need more than one // Scale down bonus for candidate passers which need more than one
// pawn push to become passed, or have a pawn in front of them. // pawn push to become passed.
if ( !pos.pawn_passed(Us, s + Up) if (!pos.pawn_passed(Us, s + Up))
|| (pos.pieces(PAWN) & (s + Up)))
bonus = bonus / 2; bonus = bonus / 2;
score += bonus - PassedFile * edge_distance(file_of(s)); score += bonus - PassedFile * edge_distance(file_of(s));