Downswings are inevitable. If you don't have the bankroll to survive them you will end up on the rail looking for a stake, or worse, a job.
Have you ever wondered?
Your bankroll is the amount of money you have to play poker. When you win that money goes in your bankroll, when you lose it comes out of your bankroll. If your bankroll goes to zero you can't play poker anymore; you are bust.
Your bust risk is the risk that you will eventually go bust. If you can easily replenish your bankroll, you may be willing to take a twenty or thirty percent chance of going bust. If your bankroll is hard to replace, you may only be willing to take a five percent chance
Standard deviation is a measure of how widely your results fluctuate. Loose agressive play will result in more fluctuation than tight passive play.</p>
It is impossible to eliminate risk from gambling, it wouldn't be gambling if you did. To be a successful professional you must understand, measure, and manage your risks.
The rule of thumb says you should have at least twenty to thirty buyins for no-limit holdem and two hundred to three hundred big bets for limit holdem. But there are a lot of reason why that might not work for you.
Know exactly what your risk of going bust is and how to minimize it.
Know exactly how much money you need in your bankroll before you start.
Find the games where you make the most money with the least risk.