Take a look at this case: Both Protoss and Zerg don't have the ability to gather resources anymore, Nexus and Hatchery are destroyed. Protoss still have a few base up. What's left of Zerg's base will ...
I'm trying to get a lot of the battle.net achievements, but some of them seem quite difficult. Specifically, "Zergling Rush" the 20 zerglings in 255 seconds achievement