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Small Queen simplification

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Moving a few lines from evaluate_threats to evaluate_pieces allows to
a) Remove a condition pos.count<QUEEN>(Them) == 1
b) use precalculated s instead of pos.square(Them)
c) do not check the condition at all in queenless endings

Passed STC
http://tests.stockfishchess.org/tests/view/5752e0410ebc59029919b1f4
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 67175 W: 12194 L: 12152 D: 42829

and LTC
http://tests.stockfishchess.org/tests/view/57587b140ebc59029919b2f4
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 20276 W: 2774 L: 2653 D: 14849

bench: 7907962
This commit is contained in:
Alain SAVARD 2016-06-04 09:57:17 -04:00 • committed by Marco Costalba
parent 0c076f1136
commit 6fed8ff22a
1 changed files with 7 additions and 7 deletions
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14
src/evaluate.cpp
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@ -348,6 +348,13 @@ namespace {
score -= (TrappedRook - make_score(mob * 22, 0)) * (1 + !pos.can_castle(Us));
}
}
if (Pt == QUEEN)
{
// Penalty if any relative pin or discovered attack against the queen
if (pos.slider_blockers(pos.pieces(), pos.pieces(Them, ROOK, BISHOP), s))
score -= WeakQueen;
}
}
if (DoTrace)
@ -489,13 +496,6 @@ namespace {
& ~(ei.attackedBy[Us][ALL_PIECES] | ei.attackedBy[Them][ALL_PIECES]))
score += LooseEnemies;
// Bonus for pin or discovered attack on the opponent queen
if ( pos.count<QUEEN>(Them) == 1
&& pos.slider_blockers(pos.pieces(),
pos.pieces(Us, ROOK, BISHOP),
pos.square<QUEEN>(Them)))
score += WeakQueen;
// Non-pawn enemies attacked by a pawn
weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];