From a Slate/New Scientist article about the so-called “risk quotient” (RQ)–intelligence about risk:
One way [of increasing RQ] is by being aware of different cognitive biases. Another is to play a personal prediction game. Bet against yourself and estimate probabilities of anything: whether your partner will get home before six, or whether it is going to rain, and keep track of them. Expert gamblers are constantly on the lookout for overconfidence, biases and so on. It is hard work, but it means they know themselves pretty well and they don’t have illusions. They know their weaknesses.