亏损加仓是博弈论中，多次博弈中的一种策略。

第一次亏损后，在下次博弈中增加筹码，以期望第二次获益时，可以部分或全部补回第一次的损失。

如第二次也亏损，那就第三次投入比第二次再增加，增幅和策略有关。

A martingale is any of a class of betting strategies that originated from and were popular in 18th century France. The simplest of these strategies was designed for a game in which the gambler wins his stake if a coin comes up heads and loses it if the coin comes up tails. The strategy had the gambler double his bet after every loss, so that the first win would recover all previous losses plus win a profit equal to the original stake. The martingale strategy has been applied to roulette as well, as the probability of hitting either red or black is close to 50%.