KK in BB, flopped third K

[rafct]

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When would be a time that I should try to get overcalls? If that isn't a time I should, when is? When I'm at higher limits?

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For instance I remember this from the small stakes holdem book: the board has 4 to a flush and you have a flush king high. A player bets out and you are second to act. If you raise now, you can get reraised and lose more bets to the ace high flush, or make others fold because of your raise. If you call you lose less when behind and make more when ahead encouraging other callers.