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Candidate passed pawns

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Detect safe candidate passers.

STC: http://tests.stockfishchess.org/tests/view/5882395c0ebc5915193f78b3
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 53569 W: 9925 L: 9570 D: 34074

LTC: http://tests.stockfishchess.org/tests/view/5882b4fb0ebc5915193f78e2
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 77576 W: 10387 L: 10014 D: 57175

Bench: 5325829
This commit is contained in:
Stefan Geschwentner
2017-01-19 18:16:23 +01:00
committed by Marco Costalba
parent 58c181de9a
commit 471f7a1b5c
2 changed files with 20 additions and 8 deletions
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15
src/evaluate.cpp
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@@ -606,10 +606,11 @@ namespace {
}
// evaluate_passed_pawns() evaluates the passed pawns of the given color
// evaluate_passer_pawns() evaluates the passed pawns and candidate passed
// pawns of the given color.
template<Color Us, bool DoTrace>
Score evaluate_passed_pawns(const Position& pos, const EvalInfo& ei) {
Score evaluate_passer_pawns(const Position& pos, const EvalInfo& ei) {
const Color Them = (Us == WHITE ? BLACK : WHITE);
@@ -622,7 +623,6 @@ namespace {
{
Square s = pop_lsb(&b);
assert(pos.pawn_passed(Us, s));
assert(!(pos.pieces(PAWN) & forward_bb(Us, s)));
bb = forward_bb(Us, s) & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
@@ -683,6 +683,11 @@ namespace {
if (!pos.non_pawn_material(Them))
ebonus += 20;
// Scale down bonus for candidate passers which need more than one pawn
// push to become passed.
if (!pos.pawn_passed(Us, s + pawn_push(Us)))
mbonus /= 2, ebonus /= 2;
score += make_score(mbonus, ebonus) + PassedFile[file_of(s)];
}
@@ -844,8 +849,8 @@ Value Eval::evaluate(const Position& pos) {
- evaluate_threats<BLACK, DoTrace>(pos, ei);
// Evaluate passed pawns, we need full attack information including king
score += evaluate_passed_pawns<WHITE, DoTrace>(pos, ei)
- evaluate_passed_pawns<BLACK, DoTrace>(pos, ei);
score += evaluate_passer_pawns<WHITE, DoTrace>(pos, ei)
- evaluate_passer_pawns<BLACK, DoTrace>(pos, ei);
// Evaluate space for both sides, only during opening
if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) >= 12222)