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Retire candidate passed pawns

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Before this commit, some pawns were considered "candidate" passed pawns and given half bonus. After this commit, all of these pawns are scored as passed pawns, and they do not receive less bonus.

STC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 21806 W: 4320 L: 4158 D: 13328
Ptnml(0-2): 367, 2526, 5001, 2596, 413
https://tests.stockfishchess.org/tests/view/5e86b4724411759d9d098639

LTC:
LLR: 2.95 (-2.94,2.94) {-1.50,0.50}
Total: 12590 W: 1734 L: 1617 D: 9239
Ptnml(0-2): 96, 1187, 3645, 1238, 129
https://tests.stockfishchess.org/tests/view/5e86d2874411759d9d098640

This PR and commit are dedicated to our colleague Stefan Geschwentner (@locutus2), one of the most respected and accomplished members of the Stockfish developer community. Stockfish is a volunteer project and has always thrived because of Stefan's talent, insight, generosity, and dedication. Welcome back, Stefan!

closes https://github.com/official-stockfish/Stockfish/pull/2613

Bench: 4831963
This commit is contained in:
31m059 2020-04-02 23:57:15 -04:00 • committed by Joost VandeVondele
parent 3cb1c6c3c6
commit fbc7a328c6
1 changed files with 0 additions and 5 deletions
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5
src/evaluate.cpp
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@ -638,11 +638,6 @@ namespace {
}
} // r > RANK_3
// Scale down bonus for candidate passers which need more than one
// pawn push to become passed.
if (!pos.pawn_passed(Us, s + Up))
bonus = bonus / 2;
score += bonus - PassedFile * edge_distance(file_of(s));
}