In what order do you need to build your initial units if your goal is to get a group of 4-6 zerglings as quickly as possible for a rush?

It's possible to achieve a checkmate in chess in just four moves. What are the moves?

When you first start off all of the world is in a "fog of war". I have always wondered how to determine where to send rushes early in the game. It seems to me that I'll find the …