A move is constructed using a session system.
When it is your turn, you click on cells you wish to claim.
If you wish to undo your most recent claim, simply click the Undo Last button.
To start over, simply click the Reset Session button.
When you are sure you have claimed all you wish to claim, simply click the Finalize Session button.
The move is then executed and the turn is passed to the next player.
The white dots indicate cells that were claimed the previous turn by your opponent.