AA vs 22 100BB Preflop Strategy and Equity Explained

In Texas Hold'em, AA (pocket Aces) and 22 (pocket Deuces) are two extreme pocket pairs – AA has the highest heads-up preflop win rate of any starting hand, while 22 is one of the lowest win-rate pocket pairs (only slightly better than a pocket pair facing overcards). When they clash preflop, especially at a stack depth of 100 big blinds (BB), the strategy and equity distribution are highly instructive. This article will cover five aspects: definition, theory, practical examples, common misconceptions, and a summary.

1. Definition and Basic Equity

• AA (Pocket Aces): A hand consisting of two Aces. Heads-up preflop against any two random cards, it has an average win rate of about 85% (though it varies depending on the opponent's actual hand).
• 22 (Pocket Deuces): A hand consisting of two Twos. Heads-up preflop against any two random cards, it has an average win rate of about 50%, but against AA it drops to roughly 18.5% (all-in to the river).

At a 100BB stack depth, a direct preflop all-in between AA and 22 is rare, but understanding their equities is crucial for strategy. The following equities are based on classic probability calculations, assuming all cards are random (no card removal effects).

2. Strategy Principles

2.1 Standard Strategy for AA

AA is an absolute premium preflop hand. At 100BB, the typical approach is an aggressive raise/3-bet strategy aimed at building the pot and narrowing opponents' calling ranges (to avoid multiway pots). Standard lines:

• In an unopened pot: open raise to 2-3 BB.
• Facing a raise: 3-bet to roughly 9-11 BB.
• Facing a 3-bet: 4-bet to about 22-25 BB; snap-call if the opponent shoves.

Core principle: AA needs to protect its hand value but also get paid by opponents. Slow-playing AA at deep stacks is extremely risky (vulnerable to draws overtaking it).

2.2 Standard Strategy for 22

22 is a typical speculative hand that profits primarily by flopping a set or making unusual hands. At 100BB, 22 should usually only call to see a flop, and only when the following conditions are met:

• Adequate implied odds: Generally, effective stacks should be at least 20 times the current call amount. For example, facing a 3BB raise, at least 60BB effective stacks are needed.
• Opponent is unlikely to fold: Avoid tight-passive players who won't pay off a set with their big pairs.
• Good position: Easier to play in the cutoff, button, or big blind.

22 should not be raised or 3-bet preflop (unless as an occasional 4-bet bluff in a mixed range), because when up against AA, it invests too much preflop with very low equity.

3. Practical Examples

Example 1: Typical Confrontation

• Effective stacks: 100BB.
• Button player raises to 2.5BB. Big blind holds AA and 3-bets to 10BB. Button holds 22 and calls.
• Analysis: Button calls 10BB. Implied odds require winning at least 200BB (10BB × 20) if they flop a set. If the flop contains a 2, the set of Deuces has about 95% equity against AA and can go all-in. If no 2, likely fold.

Example 2: Extreme Case – Preflop All-in Assume small blind shoves 100BB with 22. Big blind snap-calls with AA. This is a classic "coin flip" – AA wins about 81.9%, 22 wins about 18.1% (assuming no flush possibilities). In reality, 22 rarely shoves preflop, but this scenario is often used for illustrative equity distribution.

4. Common Misconceptions

Misconception 1: 22 can call a large preflop raise or all-in

Wrong. 22's equity against an AA all-in preflop is under 20%, and at 100BB, calling an all-in has negative EV. Correct play is to follow the implied odds rule, investing only a small amount preflop.

Misconception 2: AA must be slow-played to lure opponents in

At 100BB, slow-playing AA leads to difficult postflop multiway situations and can be overtaken by draws. Standard strategy is to build the pot aggressively.

Misconception 3: 22 can 3-bet bluff preflop to force AA to fold

Theoretically possible, but in practice AA rarely folds preflop (especially against a small 3-bet). A 3-bet bluff with 22 is better targeted at small pairs or suited connectors, not AA.

5. Summary

Core strategy for AA vs 22 at 100BB preflop:

• AA: Raise aggressively, maintain aggression, avoid slow-playing.
• 22: Only call when implied odds are sufficient; fold postflop if no set is hit.

In terms of equity, AA has an overwhelming advantage all-in (about 81%), but preflop all-ins are rare in actual play. At deep stacks, 22's value lies in its postflop potential, not in challenging AA preflop. Understanding these principles helps players make better decisions in similar situations.