Queem.Core.ChessBoard.PlayerBoard.IsUnderAttack C# (CSharp) Method

        public bool IsUnderAttack(Square sq, PlayerBoard opponentBoard)
        {
            ulong occupied = 1UL << (int)sq;

            ulong pawnAttacks = opponentBoard.GetPawnAttacks();
            if ((occupied & pawnAttacks) != 0)
                return true;

            ulong knights = opponentBoard.bitboards[(int)Figure.Knight].GetInnerValue();
            ulong king = opponentBoard.bitboards[(int)Figure.King].GetInnerValue();
            ulong otherFigures = opponentBoard.allFigures | this.allFigures;
            otherFigures &= (~occupied);

            var knightAttackGenerator = this.attacksGenerators[(int)Figure.Knight];
            ulong occupiedKnightMoves = knightAttackGenerator.GetAttacks(sq, otherFigures);
            if ((occupiedKnightMoves & knights) != 0)
                return true;

            var kingAttackGenerator = this.attacksGenerators[(int)Figure.King];
            ulong occupiedKingMoves = kingAttackGenerator.GetAttacks(sq, otherFigures);
            if ((occupiedKingMoves & king) != 0)
                return true;

            ulong rooksQueens = opponentBoard.GetRooksQueens();
            ulong bishopsQueens = opponentBoard.GetBishopsQueens();

            var rookAttackGenerator = this.attacksGenerators[(int)Figure.Rook];
            ulong occupiedRookMoves = rookAttackGenerator.GetAttacks(sq, otherFigures);
            if ((occupiedRookMoves & rooksQueens) != 0)
                return true;

            var bishopAttackGenerator = this.attacksGenerators[(int)Figure.Bishop];
            ulong occupiedBishopMoves = bishopAttackGenerator.GetAttacks(sq, otherFigures);
            if ((occupiedBishopMoves & bishopsQueens) != 0)
                return true;

            return false;
        }