From the Ferguson Challenge..."I'll never buy into a cash game or a Sit & Go with more than 5 percent of my total bankroll (there is an exception for the lowest limits: I'm allowed to buy into any game with a buy-in of $2.50 or less).
I won't buy into a multi-table tournament for more than 2 percent of my total bankroll and I'm allowed to buy into any multi-table tournament that costs $1.
If at any time during a No-Limit or Pot-Limit cash-game session the money on the table represents more than 10 percent of my total bankroll, I must leave the game when the blinds reach me. "
Seems to be working for me so far. I started with 150.00 on FT and am up over 400 in around 2 months by following the rules...Most of the time