小盲位河牌彩虹面持续下注（SB River C-Bet Rainbow）
Refers to the behavior of the small blind player making a continuation bet on the flop, and then betting again on the river when the board is a rainbow (flop three cards of different suits, no flush draw possible).
Background
In Texas Hold'em, a continuation bet (C-Bet) refers to the flop bet made by the pre-flop raiser. When the small blind (SB) is the pre-flop raiser, their position is disadvantageous throughout the hand. A rainbow flop means the three flop cards are all of different suits, implying that no flush draw or flush can be completed on the river, so drawing ranges are narrower.
Strategy Considerations
The typical scenario for an SB River C-Bet on a rainbow board is: SB makes a C-Bet on the flop and gets called; the turn goes either check-check or with a bet, leading to the river, where the river card is of a different suit from the flop, maintaining the rainbow condition. A river bet by SB usually represents either a value hand (top pair or better) or a bluff. Since rainbow boards lack flush draws, the opponent's drawing hands are mainly straight draws or pair draws. SB's bet should aim to extract value from or force folds from these ranges. Being out of position, SB must consider pot odds and the opponent's range carefully when betting on the river.
Example
Assume the SB raises pre-flop, the flop comes K♠ 7♦ 2♣ (rainbow), SB bets, and the button calls. The turn is 4♥, and both players check. The river is 9♠ (still rainbow). SB now bets. If holding top pair with a K, it's a value bet; if holding a weak hand like A-high, it's likely a bluff. The opponent's calling range includes straight draws (e.g., 56, J10) or middle pairs (e.g., 77, 22).
Note
This term is not a standard poker term but a combination of "SB", "River", "C-Bet", and "Rainbow" used in poker strategy discussions to describe a specific scenario. In practice, factors such as opponent tendencies and bet sizing should be considered.