A♠5♠ BTN vs Blinds, preflop, 100 bb

The spot

You: BTN
Opponent: Blinds
Your hand: A♠5♠
Board: preflop, no board yet
Effective stack: 100 bb
Pot: 1.5 bb

Folded to BTN in 6‑max.

Best default preflop action?

See the answer

Best play: Open 2.2bb

Why

A5s is a pure BTN open at 100bb: it flops nut-flush and wheel-straight equity, blocks villain's strong aces, and the small 2.2bb sizing maximizes steal EV against the two blinds.

Key idea

From the button you open a very wide range with a small sizing, and suited wheel aces like A5s are mandatory opens for their nut-flush/straight potential and ace blocker.