AA vs A4s: Preflop Equity & Odds
| Hand | Win | Tie | Equity |
|---|---|---|---|
| AA (Pocket Aces) | 86.5% | 1.3% | 87.1% |
| A4s (Ace-Four Suited) | 12.3% | 1.3% | 12.9% |
How AA vs A4s unfolds by street
Pocket Aces (AA) is still ahead on 98% of flops against A4s, and the lead survives to the turn on 94%. A4s takes the lead on the other 2% of flops, almost always by flopping a set. These figures come from full board enumeration, not a simulation.
| Street | AA still ahead | A4s flipped the lead |
|---|---|---|
| Flop | 98% | 2% |
| Turn | 94% | 6% |
AA vs A4s is a card-removal spot: the pair holds one of the cards the unpaired hand most wants. AA wins 86.5%, A4s wins 12.3%, and 1.3% of boards chop. Blocking an out (and vice versa) pushes the favorite past a clean race — it's one of the most common all-in confrontations you'll actually face.
At a final table the raw 87.1% / 12.9% split is only half the story — ICM bends it. As the 12.9% underdog, A4s pays an extra survival premium, so the chip-EV "close enough" call can be a clear ICM fold. The pure equity sets the floor; the payout ladder sets the real price.
In practice, AA vs A4s rewards aggression from the favorite and caution from the dog: AA wants to realize its 86.5% edge by getting value and denying free cards, while A4s should lean on fold equity and position rather than hoping to win the pot at showdown about 1 time in 8.
AA vs A4s FAQ
Who wins AA vs A4s preflop?
AA (Pocket Aces) is the favorite, winning 86.5% of all runouts, while A4s (Ace-Four Suited) wins 12.3%. The remaining 1.3% are split pots. Counting splits as half, AA's preflop equity is 87.1%.
How often does A4s beat AA?
A4s wins 12.3% of the time all-in preflop against AA — roughly 1 in 8 — so it needs good pot odds or fold equity to get the money in profitably.
Is AA vs A4s a good spot to get all-in?
For AA, yes — a 87.1% favorite should happily commit, especially with fold equity. For A4s at 12.9%, it depends on the price: enough to continue with initiative, but thin enough that stacking off out of position is usually a leak.
Does AA hold up against A4s after the flop?
AA is still ahead on 98% of flops and stays ahead through the turn on 94% of boards; A4s takes the lead on the other 2% of flops. These are exact figures from full board enumeration.
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