枪口+1河牌第五次加注彩虹面（UTG+1 River 5-Bet Rainbow）
Refers to a situation in Texas Hold'em where the player in the UTG+1 position makes a fifth raise 5-Bet on the river, and the board is a rainbow all cards of different suits.
Term Breakdown
Position: UTG+1
UTG (Under the Gun) is the position immediately to the left of the big blind, acting first pre-flop. UTG+1 is one seat to the left of UTG, a early position. Players in this position must enter pots cautiously, as many players still act behind.
Action: River 5-Bet
- River: The fifth and final community card dealt after the turn, also the last betting round.
- 5-Bet: The fifth raise. Typically pre-flop, the number of raises starts from the big blind (counted as 0). The first raise (open raise) is a 1-bet, the next raise is a 2-bet (often called a 3-bet in common terminology), the third raise is a 3-bet (actually a 4-bet), and the fourth raise is a 4-bet (actually a 5-bet). On the river, a 5-bet implies four previous raises in that round, which is extremely rare in practice since river betting rounds usually have limited action.
Board: Rainbow
Rainbow refers to a board where all community cards are of different suits. For example, the flop has hearts, spades, and clubs, and the river is diamonds, forming a rainbow board. A rainbow board eliminates the possibility of a flush draw, so hand strength relies more on the actual made hand.
Combined Meaning
"UTG+1 River 5-Bet Rainbow" is not a standard poker term but rather a specific scenario description: on the river, the UTG+1 player makes the fifth raise, and the board is rainbow. This situation usually appears only in educational content or rare hand histories, representing extreme hand strength or a huge bluff. Since a rainbow board rules out flushes, the player's raise typically indicates a very strong made hand (e.g., the nuts) or a complex bluff.
Strategic Reference
In actual games, a river 5-bet is quite rare because the pot is already large and player actions are limited. If it occurs, it usually means a massive pot and intense psychological battle. The UTG+1 position itself has a tight early range, so a river 5-bet further highlights the polarization of hand strength—either absolute nuts or an extreme play targeted at a specific opponent.