It almost always build large late game fleets with only 1 or 2 large fast ships and puts in many small slow (10-15) ships. So it hobbles with only 2-4 moves. My fleet of 4-5 large wipes out AI fleet of 20 ships. Many times i see an AI fleet that can destroy mine, and then it moves and disbands the fleet into a stack of single ships which i can pick off one by one