annie duke won millions at poker and advises hedge fund traders on decision making. her warning: knowing your biases does nothing to remove them: "traders say to me: I know about all that stuff. every morning I wake up and think, if I weren't holding these positions, would I buy them today?" "the problem is that's only the right question if your answer is going to be rational. and once you're already in the position, it isn't. so you have an irrational answer, but you think you were rational about it. your confidence that you're in the right positions goes up even though the accuracy has not." "you can't think your way out of confirmation bias." her fix: "make it explicit and write it down. any time rates fall below this benchmark after this date, I must sell. it just turns out it really matters if you decide in advance versus deciding on the fly. it makes a huge difference." knowing the bias doesn't remove the bias. deciding in advance can. this is why I automate. my systems all criteria written in code. every exit was agreed on before the money was ever at risk.