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Poker is a family of games that exhibit imperfect information, where players do not have full knowledge of past events. Whereas many perfect-information games have been solved (e.g., Connect Four and checkers), no nontrivial imperfect-information game played competitively by humans has previously been solved.

If there's no action (bet) to you, there's nothing to call. If you don't want to bet, you can just "check." If there's subsequent action from your fellow players in the betting round, then the action will come back to you to either call, fold or raise. Check-Raise.