When already feeling the discomfort with the game, the long red happens .. should be able to predict the gains and detailed calculations i guess. Some people too much too long to play until finally even suffered a very severe loss. Use strong feeling and leave the games when more lost, trying at next time.
That's right, lost couple of times in a row - leave. Don't try to recover or you'll end up like most gamblers who try to recover their losses the same day - you'll lose much more than at first.
Same goes for when you win, otherwise your winning day might turn to losing day eventually.