digraph {
    {
        rank=same;
        0 [ style="invisible" shape="point" width=0 ];
        3 [ style="invisible" shape="point" width=0 ];
    }

    {
        rank=same;
        1 [ style="invisible" shape="point" width=0 ];
        4 [ style="invisible" shape="point" width=0 ];
    }

    {
        rank=same;
        2 [ style="invisible" shape="point" width=0 ];
        5 [ style="invisible" shape="point" width=0 ];
    }

    {
        rank=same;
        r1 [ label="Runde 1" shape="box" ];
        s1 [ label="" shape="box" ];
    }

    {
        rank=same;
        rn [ label="Runde n" shape="box" ];
        sn [ label="" shape="box" ];
    }



    3 -> s1 [ label="K" ];

    s1 -> r1 [ label="K1" ];

    s1 -> 4;
    4 -> sn [ style="dotted" ];
    sn -> rn [ label="Kn" ];

    0 -> r1 [ label="x" ];
    r1 -> 1;
    1 -> rn [ style="dotted" ];
    rn -> 2 [ label="y" ];
}