How does build-order naming work for Zerg?
For example, does "13-pool" mean "spawn 13 drones, and turn the 13th into a pool" (so that now you are at 12 supply)? Or does it mean "spawn 13 drones, then turn the 14th into a pool" (so that now you are at 13 supply)?
Solution 1:
It means the former. You build the spawning pool while you're at 13 supply. Going down to 12 supply is a side-effect but replacing the drone as soon as possible is important to any build.