Doubles is much more complex than singles. At a basic level, there is simply more of a possibility of finding a weakness in doubles opponents since each player has a fh, bh, serve, oh, and fh and bh volleys. Sharing information with your partner at the end of the warmup is crucial for getting a good shot at making a good game plan. Remember, there is no rule about where players need to stand to begin the point. Adjusting positions in the basic formation or using alternative formations can be a huge help in turning a match. This is a skill which can be learned. Being an emotionally supportive partner is key as well.