按钮位翻牌前冷跟注彩虹面（BTN Preflop Cold Call Rainbow）

Term Formation

• BTN (Button): The button position, which is the dealer position, has the last action preflop and offers positional advantage.
• Preflop: The betting round after the hole cards are dealt but before any community cards are revealed.
• Cold Call: Calling a raise without having previously invested any dead money (such as blinds), as opposed to a call from the blinds or a player already in the pot.
• Rainbow: A flop where all three community cards are of different suits, thus no flush draw is possible.

Contextual Interpretation

"BTN Preflop Cold Call Rainbow" describes a specific preflop-to-flop scenario:

• Action sequence: A player raises preflop, and the button player cold-calls (having not yet posted blinds or acted). The flop then comes with three cards of different suits (rainbow).
• Strategic significance: On a rainbow flop, with no flush draw possible, the button's cold-calling range may center on high pairs, connectors, suited connectors (but without a flush draw), etc. Additionally, the cold call itself suggests the player holds a strong playable hand but chose not to 3-bet, possibly for balance or to induce action.

Notes

• This term is not a standard poker abbreviation but a combined description, often used when discussing specific hands or strategies.
• "Preflop Cold Call" and "Rainbow" belong to different phases; "Rainbow" strictly describes the flop's property. However, the term as a whole refers to the complete action and subsequent board texture.

Typical Example

In a hand, the cutoff raises to 3 BB. The button holds A♥Q♠ and chooses to cold-call. The flop comes K♣7♦2♠ (all different suits). This is a "BTN Preflop Cold Call Rainbow" situation.