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When playing in a cash game, it is always to your advantage to make certain that you are playing the right game for your bankroll,otherwise you will end up losing .
If you are just starting to play cash games, pick the game you can feel comfortable with. By this I mean, don't play in a game where you can't compete with the table stakes.
Example: if you are playing in a one-two no limit game with a $40 to $200 buy-in make sure you can buy in for the maximum amount. Why? Because when you do that you retain your ability to bluff and resist a bluff because your chip count is high. Also you can make bets which will many times allow you to take down a pot which you otherwise would lose.