+ [[maybe_unused]] Bitboard threatenedByPawn, threatenedByMinor, threatenedByRook;
+ if constexpr (Type == QUIETS)
+ {
+ Color us = pos.side_to_move();
+
+ threatenedByPawn = pos.attacks_by<PAWN>(~us);
+ threatenedByMinor = pos.attacks_by<KNIGHT>(~us) | pos.attacks_by<BISHOP>(~us) | threatenedByPawn;
+ threatenedByRook = pos.attacks_by<ROOK>(~us) | threatenedByMinor;
+
+ // Pieces threatened by pieces of lesser material value
+ threatenedPieces = (pos.pieces(us, QUEEN) & threatenedByRook)
+ | (pos.pieces(us, ROOK) & threatenedByMinor)
+ | (pos.pieces(us, KNIGHT, BISHOP) & threatenedByPawn);
+ }
+