[pzhon]

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Playing within your roll
Stepping away when you're not on your A game
Not playing table games (in vegas)
Taking time to study the game and analyze your play

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Here are a few others:

Putting in the hours.
Moving up into scarier games when it's right to take a shot.
Losing graciously when someone plays badly and beats you.
Not discussing advantage gambling with people who won't understand.
Questioning your play whether you win or lose.

The last is different to me than taking the time to study. It's easy for me to take an hour to learn basic ideas in badugi. I've never played badugi, and my ego doesn't get in the way of learning. It's much harder to look for leaks in the games I have played successfully for years, but that is what I do to advance my game.