4 PC Teams is a teams variant. That means the whole game is designed to be a cooperative effort. Thus, it is important to your winning strategy that you learn how to use the arrows (right click and drag) to plan your moves with your teammate. It is vital to your survival. A coordinated team will beat an un-coordinated one every time (in my experience).
Our opp can never see what we do on the 4PC FFA board
It's also very annoying when you're about to win and then randomly your partner resigns and then you lose because of their choice.