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Simplify unstoppable pawns

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Tested in no-regression mode and passed both

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 17919 W: 3103 L: 2978 D: 11838

and LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 31460 W: 4414 L: 4308 D: 22738

bench: 7709279
This commit is contained in:
Leonid Pechenik
2014-06-16 12:32:11 +02:00
committed by Marco Costalba
parent 73ca93f3c0
commit 66c93245e0
1 changed files with 8 additions and 11 deletions
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19
src/evaluate.cpp
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@@ -613,17 +613,14 @@ namespace {
// evaluate_unstoppable_pawns() scores the most advanced among the passed and
// candidate pawns. In case opponent has no pieces but pawns, this is somewhat
// related to the possibility that pawns are unstoppable.
// candidate pawns. In case both players have no pieces but pawns, this is
// somewhat related to the possibility that pawns are unstoppable.
Score evaluate_unstoppable_pawns(const Position& pos, Color us, const EvalInfo& ei) {
Score evaluate_unstoppable_pawns(Color us, const EvalInfo& ei) {
Bitboard b = ei.pi->passed_pawns(us) | ei.pi->candidate_pawns(us);
if (!b || pos.non_pawn_material(~us))
return SCORE_ZERO;
return Unstoppable * int(relative_rank(us, frontmost_sq(us, b)));
return b ? Unstoppable * int(relative_rank(us, frontmost_sq(us, b))) : SCORE_ZERO;
}
@@ -716,10 +713,10 @@ namespace {
score += evaluate_passed_pawns<WHITE, Trace>(pos, ei)
- evaluate_passed_pawns<BLACK, Trace>(pos, ei);
// If one side has only a king, score for potential unstoppable pawns
if (!pos.non_pawn_material(WHITE) || !pos.non_pawn_material(BLACK))
score += evaluate_unstoppable_pawns(pos, WHITE, ei)
- evaluate_unstoppable_pawns(pos, BLACK, ei);
// If both sides have only pawns, score for potential unstoppable pawns
if (!pos.non_pawn_material(WHITE) && !pos.non_pawn_material(BLACK))
score += evaluate_unstoppable_pawns(WHITE, ei)
- evaluate_unstoppable_pawns(BLACK, ei);
// Evaluate space for both sides, only in middlegame
if (ei.mi->space_weight())