A bluff or deceptive move made in response to an opponent's bluff, often used in card games and strategic contexts.
From counter- (opposite, in response to) + buff (a feint or false claim, especially in poker). A gaming term from 19th-century card game vocabulary.
Professional poker players consider the counterbuff the highest level of psychological play—you're essentially saying 'I know you're bluffing, and I'm betting that you know I know,' which creates multiple layers of strategic thinking.
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