Um Rise of Nations: where the AI builds another city in an attempt to survive and split my forces. Dawn of War: (Just recently), I watch a schoolmate play with the Eldars on some map against them ghost dudes (Faction in the demo) and the AI built like 3 HQs or 6 or something and he nearly lost until he destroyed the last HQ quickly (nextdoor also so it was quick). Battlegrounds: The AI builds tons and tons of Command centers and Fortresses that its more of how long you can survive with your perfect army then how many units you swarm since ones down another pops up. Homeworld 2, warlords mod: AI built another Mothership or Spacestation that you need in order to build other stuff.