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No functional chnage.
This commit is contained in:
Marco Costalba
2015-03-29 09:24:17 +02:00
parent 61a6e46664
commit 6c42575208
3 changed files with 20 additions and 19 deletions
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src/evaluate.cpp
+11 -12
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@@ -498,25 +498,24 @@ namespace {
enum { Defended, Weak };
enum { Minor, Major };
Bitboard b, weak, defended, safe_pawns, safe_pawn_threats, unsafe_pawn_threats;
Bitboard b, weak, defended, safeThreats;
Score score = SCORE_ZERO;
// Pawn Threats
b = ei.attackedBy[Us][PAWN] & (pos.pieces(Them) ^ pos.pieces(Them, PAWN));
// Non-pawn enemies attacked by a pawn
weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];
if (b)
if (weak)
{
safe_pawns = pos.pieces(Us, PAWN) & (~ei.attackedBy[Them][ALL_PIECES] | ei.attackedBy[Us][ALL_PIECES]);
safe_pawn_threats = (shift_bb<Right>(safe_pawns) | shift_bb<Left>(safe_pawns)) & (pos.pieces(Them) ^ pos.pieces(Them, PAWN));
unsafe_pawn_threats = b ^ safe_pawn_threats;
b = pos.pieces(Us, PAWN) & ( ~ei.attackedBy[Them][ALL_PIECES]
| ei.attackedBy[Us][ALL_PIECES]);
// Unsafe pawn threats
if (unsafe_pawn_threats)
safeThreats = (shift_bb<Right>(b) | shift_bb<Left>(b)) & weak;
if (weak ^ safeThreats)
score += ThreatenedByHangingPawn;
// Evaluate safe pawn threats
while (safe_pawn_threats)
score += ThreatenedByPawn[type_of(pos.piece_on(pop_lsb(&safe_pawn_threats)))];
while (safeThreats)
score += ThreatenedByPawn[type_of(pos.piece_on(pop_lsb(&safeThreats)))];
}
// Non-pawn enemies defended by a pawn