关煞位河牌干燥牌面冷跟注（CO River Cold Call Dry）
Refers to the action of a player in the cutoff position CO making a cold call on the river on a dry board no straight or flush possibilities.
Term Analysis
CO River Cold Call Dry consists of four elements:
- CO: Cut Off, the position directly to the right of the button.
- River: The fifth and final community card.
- Cold Call: Calling a bet without having previously raised in the current betting round. Note that on the river, "cold call" usually refers to calling a bet, not a raise.
- Dry: A board texture that makes it difficult to have a straight or flush draw, e.g., a rainbow board with unconnected ranks.
Strategic Implications
This term describes a specific scenario: after the river card is dealt, the board is very dry (e.g., J♠7♣2♦K♣3♥, no flush or straight possible), and the CO player chooses to call when facing a bet from an opponent. Typically, such a call indicates that the CO player holds a medium-strength hand (e.g., top pair or two pair), believing that their hand is not strong enough to raise but can beat the opponent's bluffs or value betting range. A dry board reduces drawing possibilities, so the opponent's bet usually represents a made hand. The CO's cold call aims to control the pot and induce bluffs.
Notes
This term is rarely used alone in poker literature; it is more often used as a descriptive phrase. Actual decision-making needs to consider opponent tendencies, bet sizing, and the player's own range balance. Cold calling on a dry board can also be part of an exploitative strategy.