// We don't use a Score because we process the two components independently.
const Value Passed[][RANK_NB] = {
{ V(5), V( 5), V(31), V(73), V(166), V(252) },
- { V(7), V(14), V(38), V(64), V(137), V(193) }
+ { V(7), V(14), V(38), V(73), V(166), V(252) }
};
// PassedFile[File] contains a bonus according to the file of a passed pawn
const Score TrappedRook = S(92, 0);
const Score Checked = S(20, 20);
const Score ThreatByHangingPawn = S(70, 63);
+ const Score LooseEnemies = S( 0, 25);
const Score Hanging = S(48, 28);
const Score ThreatByPawnPush = S(31, 19);
const Score Unstoppable = S( 0, 20);
Bitboard b, weak, defended, safeThreats;
Score score = SCORE_ZERO;
+ // Small bonus if the opponent has loose pawns or pieces
+ if ( (pos.pieces(Them) ^ pos.pieces(Them, QUEEN, KING))
+ & ~(ei.attackedBy[Us][ALL_PIECES] | ei.attackedBy[Them][ALL_PIECES]))
+ score += LooseEnemies;
+
// Non-pawn enemies attacked by a pawn
weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];