Use Rocket to move a chicken to any free roost on the board or to swap
positions with another chicken no matter the distance and ignoring any
obstacles that might be in the way (8 instances per game).
Click on Rocket to activate, then click on the chicken you want to move.
Next, click on a free roost (to move to a new cell) or click on another
chicken (to make a long distance chicken swap). For example clicking on
the white bird and the violet bird will make a long distance swap.
In this example, the long distance swap creates two chicken lines. As at
least one line is created no new birds are added to the board.
Note: If no lines are created, using Rocket constitutes a move and 3 birds
will be added to the board.