Flexibilty

With only 15 checkers at your disposal you need to make sure every checker is working to its maximum.
You have to place your checkers so more of your future numbers will be useful.

Unstacking: Look to reduce large stacks of checkers.
Diversify: Create as many builders as possible bearing on a Key Point.
Slot: Place a checker on the Point you need to make, with the idea of covering it next turn.

Playing this way creates mobile, flexible positions.