I'm not quite sure why we have to fight the adrenaline rush when it's a perfectly normal body response to external stimuli. I agree that you need to be able to hold back during a loss, but adrenaline has nothing to do with it, because this hormone is aimed at mobilizing all the forces of man to do something important, and is not designed to make you gamble. If you think that during an adrenaline surge the probability of winning increases, you are deeply mistaken. The adrenaline rush is very good during a fight because it dulls the feeling of pain.