Thin value betting involves betting with hands that beat only a narrow portion of the opponent’s calling range, typically when ahead of 50-60% of hands that would call. The decision requires careful analysis of the opponent’s calling range: if many worse hands would call but few better hands would fold, a thin value bet carries positive EV. Sizing for thin value should generally be smaller to induce calls from hands that might fold to larger bets. Incorrect thin value bets against tight opponents can result in being called predominantly by superior holdings.