Square Mitchell movement for 4 tables:

    T1---T2
    | >< |
    T3---T4

E-W pairs move .... horizontally, then vertically, then horizontally.
Boards move ....... diagonally, then horizontally, then diagonallly.

Round     T1           T2           T3           T4
 No.  NS  EW  Bd   NS  EW  Bd   NS  EW  Bd   NS  EW  Bd
 
  1    1   1   1    2   2   2    3   3   3    4   4   4
  2    1   2   4    2   1   3    3   4   2    4   3   1
  3    1   4   3    2   3   4    3   2   1    4   1   2
  4    1   3   2    2   4   1    3   1   4    4   2   3