The days of 6 Pools are long gone unless your Drones are feeling sacrificial, but you can still cheese your opponent by going for a 12 Pool.
12 | 0:18 | Spawning Pool | |
11 | 0:22 | Drone | |
11 | 0:27 | Drone | |
13 | 0:36 | Overlord | |
13 | 1:06 | Zergling x6 |
Pull the Drones as well just to really make it all in. Maybe leave 1 or 2 behind so you can produce more Zerglings. And build offensive Spine Crawlers for fun.
But don't do it on a 4 player map. That is ripe for disaster