UTG河牌圈3-Bet彩虹牌面（UTG River 3-Bet Rainbow）
Refers to the UTG player making a 3-bet re-raise against an opponent's bet on the river, with the board being a rainbow no flush possible.
Concept
“UTG River 3-Bet Rainbow” is not a standard poker term but a descriptive phrase combining position (UTG), street (River), action (3-Bet), and board texture (Rainbow). In No-Limit Texas Hold'em, UTG (Under the Gun) refers to the position immediately to the left of the big blind, the first to act preflop. The River refers to the final betting round after the last community card is dealt. A 3-Bet typically refers to the third bet preflop (a re-raise of an initial raise), but on the river, a 3-Bet generally means a re-raise after facing an opponent's bet (i.e., a second raise). Rainbow describes a board composed of three or four different suits, eliminating the possibility of a flush draw.
Typical Scenario
This combination often appears in strategic analysis to describe a specific situation: a UTG player chooses to 3-bet on the river after facing an opponent's bet, with the board being a rainbow. Since UTG’s preflop opening range is typically tight, a river 3-bet usually represents a very strong hand (e.g., the nuts or a powerful bluff). The rainbow board removes the possibility of a flush, making hand value more dependent on pairs or straights.
Notes
In actual gameplay, a river 3-bet is less common than a preflop one, and bet sizing and ranges vary greatly among players. Therefore, this term is more often used in teaching examples than as a high-frequency in-game strategy. As a non-standard term, its specific meaning should be clarified based on context.