For a lot of people it is usefull to have a preset stop loss, like for instance 3 buyin or 300BB for a cash game. If you are down that much, you stop for the day, no matter how good you think, the games are, or how much you want to "get back" at those players, who won your money. The games will always be there again tomorrow, but your bankroll might not, unless you learn to protect it.
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