medium · Poker Theory Preflop

Game: No-Limit Hold'em | Format: Cash Game | Blinds: 1/2 | Hero Position: Under the Gun (UTG) | Context: You are constructing an opening range for a standard 6-max game. Why is A9o typically excluded from this position's Raise-First-In (RFI) range while being included on the Button (BTN)?

1. The hand suffers from diffuse equity and frequently makes dominated top pairs that struggle out of position.
2. The raw equity of A9o decreases significantly when more players are left to act behind you.
3. The combinatorics of A9o (12 combos) make it too likely that someone behind holds a stronger Ace.
4. It is better to fold A9o to preserve a tight table image for later bluffs.

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