中位河牌彩虹面全下（MP River Jam Rainbow）
A descriptive referring to a player in middle position MP jamming on the river, with the river board being a rainbow (i.e., all three flop cards are of different suits).
This term is not a standard poker term but an informal description of a specific hand scenario. "MP" stands for "Middle Position," typically referring to the middle position in a six-handed table (after UTG+1 or LJ); "River" refers to the fifth community card (the river); "Jam" means an all-in bet; "Rainbow" describes a flop where the three cards are all of different suits (a rainbow board). When combined, it usually emphasizes a player in middle position making an all-in bet on the river, with a rainbow flop (low probability of a flush draw). Since a rainbow board reduces the possibility of flushes, the all-in often represents a strong hand (such as a straight or a set) or a value bet. This term is commonly seen in discussions or coinages within the Chinese poker community, has low international usability, and should not be used as a standard competitive poker term.