Don't know the name of the type of pool, but they sound fun. I believe each player throws in X amount per month, and each player gets assigned a team. If your team scores exactly X (I believe the person who told me about it used 13) runs you win the amount in the pool for that month, and then it starts over.

If nobody wins... the pool is doubled the next month. What is the name of this type of pool and where can I find official rules? I'd like to set one up starting mid May. Thanks in advance.