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Two simplifications in passed pawns evaluation

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These two simplifications appear to be affecting and/or offsetting each other.
Neither can be removed independently, but in combination they pass -3,1.

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 36391 W: 7888 L: 7795 D: 20708
http://tests.stockfishchess.org/tests/view/5b9bce410ebc592cf275f1b2

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 19513 W: 3237 L: 3114 D: 13162
http://tests.stockfishchess.org/tests/view/5b9c0edf0ebc592cf275f80e

Closes https://github.com/official-stockfish/Stockfish/pull/1769

bench 4059356
This commit is contained in:
protonspring 2018-09-14 09:04:11 -06:00 • committed by Stéphane Nicolet
parent 49b1591505
commit 13d06edb84
1 changed files with 0 additions and 6 deletions
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6
src/evaluate.cpp
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@ -159,7 +159,6 @@ namespace {
constexpr Score CloseEnemies = S( 6, 0); constexpr Score CloseEnemies = S( 6, 0);
constexpr Score CorneredBishop = S( 50, 50); constexpr Score CorneredBishop = S( 50, 50);
constexpr Score Hanging = S( 57, 32); constexpr Score Hanging = S( 57, 32);
constexpr Score HinderPassedPawn = S( 8, 0);
constexpr Score KingProtector = S( 6, 6); constexpr Score KingProtector = S( 6, 6);
constexpr Score KnightOnQueen = S( 21, 11); constexpr Score KnightOnQueen = S( 21, 11);
constexpr Score LongDiagonalBishop = S( 46, 0); constexpr Score LongDiagonalBishop = S( 46, 0);
@ -638,9 +637,6 @@ namespace {
assert(!(pos.pieces(Them, PAWN) & forward_file_bb(Us, s + Up))); assert(!(pos.pieces(Them, PAWN) & forward_file_bb(Us, s + Up)));
if (forward_file_bb(Us, s) & pos.pieces(Them))
score -= HinderPassedPawn;
int r = relative_rank(Us, s); int r = relative_rank(Us, s);
int w = PassedDanger[r]; int w = PassedDanger[r];
@ -688,8 +684,6 @@ namespace {
bonus += make_score(k * w, k * w); bonus += make_score(k * w, k * w);
} }
else if (pos.pieces(Us) & blockSq)
bonus += make_score(w + r * 2, w + r * 2);
} // w != 0 } // w != 0
// Scale down bonus for candidate passers which need more than one // Scale down bonus for candidate passers which need more than one