god damn, that's clever https://en.wikipedia.org/wiki/Kelly_criterion

"If losing, the size of the next bet gets cut; if winning, the stake increases."

beautiful risk management

> Let us return to the gambler who had 60% odds of doubling his bet and 40% odds of losing it. Kelly says that his edge is 02 and his odds are 1 so you should bet 02 of your bankroll. Now let's look at the potential returns at different numbers of bets:

http://www.elem.com/~btilly/kelly-criterion/