hard · Poker Theory Preflop

Game: Heads-Up NLHE | Format: Cash | Blinds/Antes: 0.50/1.00 | Effective Stacks: 100 bb | Hero Position: BTN | Pot Size: 1.5 bb Why is A2o a mandatory open in Heads-Up play from the BTN while being a standard fold in 6-max Under the Gun (UTG)?

1. Against an 85% range, Ace-high holds significant showdown value and is rarely dominated.
2. In 6-max, the rake is lower, making A2o less attractive.
3. The BTN in HU has 100% equity realization regardless of hand strength.
4. The SPR is higher in heads-up play, allowing for better realization of the wheel draw.

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