Method xRay

src/main/java/pieces/King.java:165–179

(Move move, Board board, Piece king)

    }

    private static boolean xRay(Move move, Board board, Piece king) {
        final Line line = new Line(move.piece.position, move.target);
        for (int index = 1; index < 8; index++) {
            final int row = move.piece.position.row + index * line.rowDiff, col = move.piece.position.col + index * line.colDiff;
            if (Utils.withinBoardLimits(row, col)) {
                if (!board.isEmpty(row, col)) {
                    final Piece piece = board.getPiece(row, col);
                    return piece.color != king.color && (piece.sameType(line.minorPieceType) || piece.sameType(PieceType.QUEEN));
                }
            } else {
                break;
            }
        }
        return false;
    }
}