great odds. The chances that a 4, 5, or 6 will come up is 50 per-
cent, since there are six sides, and three of those sides will pay 2
to 1. The odds indicate that if you rolled four times, you most
likely would get two losses and two wins. If you bet $100 each
time, you’d lose twice and win twice for a net gain of $200 for
the four rolls.
What size bet would you make if you had only $1,000 in your
pocket: $1,000? $500? $100? The problem is that even though the
game is in your favor, you still have a chance of losing. If you bet too
big and lose too many times in a row, you could lose all your money
and forfeit the ability to keep playing through pure chance. If you
bet $500 and lose twice in a row, you’ll be out of money. There is a
25 percent chance of losing twice in a row on the first two rolls; so
with a $500 bet, your risk of ruin is 25 percent with just two rolls.
One of the most important aspects of risk of ruin is that it
increases disproportionately as the size of the bet rises. Doubling
the amount risked per trade typically will not just double the risk
of ruin; depending on the particulars of the system, it might triple,
quadruple, or even quintuple it.
The Science of Controlled Risk
Money management refers to managing the size of market risk
to ensure one’s ability to keep going through the inevitable bad
periods that every trader experiences. Money management is the
science of keeping your risk of ruin at acceptable levels while
maximizing your profit potential.
The Turtles used two approaches to money management. First,
we put our positions in small chunks. That way, in the event of a
32 • Way of the Turtle