关煞位河牌单色下注-弃牌（CO River Bet-Fold Monotone）

Strategy Background

This line is common when both the flop and turn are monotone (same suit), and the river completes the flush, resulting in an extreme board with all five community cards suited. At this point, it is highly likely that a flush—or even a straight flush—has been made. The CO position (cutoff) has a positional advantage after the flop, but on a monotone river board, a raise from an opponent almost always signifies strength.

Core Logic

• Purpose of the bet: As part of a mixed strategy for value or bluff. If holding a small flush or medium-strength hand, betting can extract value from small pairs or worse hands; if holding a non-flush hand (e.g., top pair), betting may force opponents to fold weaker hands while also preventing a free showdown.
• Reason for folding: On a monotone river board, the opponent's raising range is extremely polarized—typically containing only the nut flush (e.g., A-high flush) or a straight flush. Since no straights or full houses are possible on this board, the raiser is unlikely to have a weak hand. Therefore, even holding a small or medium flush is often dominated, and folding avoids a larger loss.

Typical Example

Suppose the board is A♠ K♠ Q♠ J♠ 10♠ (a straight flush board already made). The CO player holds 7♠ 2♠ (a small flush) and bets, then faces a raise from the button. Since the button likely holds a larger flush made with A♠ or K♠, the CO should fold.

Notes

• Frequency control: This strategy should not be used too frequently, or opponents can exploit it by raising.
• Positional influence: The CO's advantage lies in observing actions, but after a river raise, that positional edge disappears.
• Opponent tendencies: If the opponent rarely bluff-raises on the river, then bet-fold is more effective; if the opponent frequently makes large bluffs, consider calling instead.