CO河牌单调面反主动下注（CO River Donk Bet Monotone）

Term Explanation

CO (Cutoff) is the position to the right of the dealer in six-handed or full-ring games, typically acting last post-flop (except the dealer). Donk Bet refers to a player who did not take the betting lead on the previous street leading out on the current street. It usually occurs on the flop but can also appear on the turn or river. Monotone means all cards on the board are of the same suit, e.g., three community cards all hearts.

On a monotone river, the board has completed a flush, and players who were drawing to a flush have made their hand. If the CO player chooses to donk bet on the river, it typically indicates they hold a flush (especially an ace-high flush or a small flush) or a full house (e.g., a set or two pair that improved to a full house on the river). Since the monotone board makes the nut flush (i.e., ace-high flush) the strongest hand, the donk bet often aims to extract value from an opponent's weaker flush or pair.

Strategic considerations:

• The CO's donk bet may exploit the opponent's fear of the monotone board, forcing the opponent to fold non-flush hands.
• When facing a donk bet on the river, the opponent must evaluate whether the CO's range contains a flush. If the opponent holds an ace-high flush, they might raise; with a smaller flush, they might call; without a flush, they usually fold.
• The sizing of the donk bet is also crucial — typically medium-small (e.g., 1/3 pot) to induce calls, or large (e.g., full pot) to maximize value.

Common misconceptions: Donk betting on a monotone river is uncommon, as most players would have already bet or check-raised on the flop or turn. The CO's donk bet on the river usually signals very strong hand strength, but it could also be a bluff mimicking a flush.

Example: Board is Ah 8h 3h 2h 7h (all hearts). The CO player holds Kh Qh and donk bets on the river, representing a flush.