Try to get the jug in the corner. That will make it be in the mose useful place, as rooks and queens and bishops usually go there...
Also, when you start, try to do as many combos as possible (first with chess, then with numbers, then wich chess and so on) of course use the same twice, if you cant get the diferent one.
Try to get all gray before desapearing one piece. Also, try to clear the boad instead of doing combos (as exeption what I said up there).
Elve