4 Pool in StarCraft

4 Pool is a Zerg rushing technique that is extremely difficult. You need to be very good at 'microing' if you want to try this.

Steps

Send your drones to mine minerals. Be sure to select a different mineral pile for each drone.It will be better that every drone start to mining at the same time.
Send your overlord to scout. Especially on a map with greater than two starting locations, it's critical that you know where your opponent is so that your early zerglings can do a large amount of damage.
Do not build any new drones. Instead, wait until you have sufficient minerals for a spawning pool.
Build a spawning pool.
You may build additional drones, but 1-2 is good enough. Use the 1st or 2nd one you build to start to scout if it is a 3 or more player map.
By now you should have almost 150 minerals if you made 2 drones, and more than 150 if you only made 1. Build 3 sets of zerglings, and scout if needed.
Take your zerglings to attack the enemy base (select all of them at once).
Micro! If you do not micro, you are guaranteed to lose. Mainly focus on the basic military units, then the miners, and then the buildings. Note: if you do not keep sending zerglings over to the enemies' base there is a good chance that person will overcome the technique, and win himself/herself for rushing is key.
Continue to pump out zerglings while your drones mine. The enemy will eventually crack and give in unless they have a good defense.

You chance of winning will probably be higher if you take all strategies into account. This guide will help you have fun, but it is not a serious tactic.

There is a good chance you will lose the game if your gambit does not succeed. If the opponent blocks access to his or her base with buildings, you will lose. It does not work well in maps with many possible starting points or long rush distances.
Make sure to prevent your opponent detecting your planning,or you will mostly lose the game.