Martingale is a bet sizing technique for increasing odds of winning at the expense of increased risk. The classic example is a coin flipping game where the gambler doubles his bet if he loses, in the hopes of making back any losses to break even. He will continue doubling his bet through subsequent losses until the bet breaks even.
Van Tharp had designed The Position Sizing™ Game to help you learn the secrets to trading success before you play the markets. This game does not simulate picking stocks in the market. Instead, it simulates trading a system that has certain characteristics. The system takes care of the ‘stock picking’ for you so that you can focus entirely on the most important aspects of trading-position sizing and letting your profits run