1   2   3   4   5   6   7
  +---+---+---+---+---+---+---+
  |                           |
 1| B                         |
  |                           |
  +   +   +   +---+   +   +   +
  |           |               |
 2|         A |               |
  |           |               |
  +   +   +---+   +   +   +   +
  |                           |
 3|                     b     |
  |                           |
  +   +   +   +   +   +   +   +
  |                           |
 4|                         C |
  |                           |
  +---+---+---+---+---+---+---+
6 different 6 move solutions:

robot A moves north
robot A moves east
robot A moves south
robot C moves west
robot B moves south
robot B moves east
robot B reaches the goal after 6 moves

robot A moves north
robot C moves north
robot A moves east
robot A moves south
robot B moves east
robot B moves south
robot B reaches the goal after 6 moves

robot A moves west
robot A moves south
robot A moves east
robot C moves north
robot B moves east
robot B moves south
robot B reaches the goal after 6 moves

robot A moves west
robot C moves west
robot A moves south
robot A moves east
robot B moves south
robot B moves east
robot B reaches the goal after 6 moves

robot C moves north
robot A moves north
robot A moves east
robot A moves south
robot B moves east
robot B moves south
robot B reaches the goal after 6 moves

robot C moves west
robot A moves west
robot A moves south
robot A moves east
robot B moves south
robot B moves east
robot B reaches the goal after 6 moves