枪口位翻牌前过牌-弃牌彩虹面（UTG Preflop Check-Fold Rainbow）
A strategy of check-folding from UTG under the gun preflop, typically combined with a rainbow flop. However, since checking preflop is not possible under standard rules, this term is mostly used in non-standard or simulated contexts.
Term Structure
This term consists of three parts: UTG (Under the Gun), Preflop, Check-Fold, and Rainbow. In standard Texas Hold'em, UTG is the first player to act preflop, who can only raise or fold, not check. Therefore, this term is not a standard action sequence and may refer to the following scenarios:
- After calling a raise preflop, choosing to check-fold on the flop when facing a rainbow board (three cards of different suits).
- In simulation or training tools, it is used to describe a tight-passive preset strategy.
- A typo or informal usage, with the actual intent being "UTG preflop fold" or "check-fold on the flop."
Common Misconceptions
- Preflop check: Only possible from the blinds or after there is already a bet; UTG as the first actor cannot check.
- The term "rainbow" usually describes the distribution of suits on the flop, unrelated to preflop.
Practical Application
This term rarely appears in professional poker literature or strategy discussions. If encountered in practice, it is advisable to ignore it or ask for the specific context. For beginners, priority should be given to mastering standard terms such as UTG Open-Raise or Check-Fold on Flop.