AA vs 22: 100BB Preflop Strategy

Definition and Background

In Texas Hold'em, AA and 22 are two starting hands with vastly different preflop strength. AA is the strongest pocket pair, winning over 80% of the time against any single hand preflop (except against another AA). 22 is the smallest pocket pair, with generally low preflop equity, but devastating postflop when it flops a set. With an effective stack of 100 big blinds (100BB), this is a common deep-stack scenario where preflop decisions involve direct equity, implied odds, position, and opponent range.

This article discusses preflop strategy for holding AA and 22 at 100BB standard depth, including raising, calling, re-raising (3-bet), and decision logic when facing different actions.

Equity Principles

In terms of absolute equity, AA vs 22 preflop heads-up has approximately 80% equity (exact: AA wins 80.19%, 22 wins 19.81%, ignoring ties). This 80% comes from AA maintaining its pair dominance across five community cards, while 22 only has about a 1/8 chance of flopping a set (if it doesn't, equity drops dramatically).

However, preflop equity is not the only factor. Although 22 has low direct equity, it has extremely high implied odds: when it flops a set, it often wins AA's entire stack, especially when the AA holder is unwilling to fold. AA has high direct equity but may face being outdrawn on dangerous flops (e.g., straight or flush draws) and may struggle to extract maximum value.

Therefore, at 100BB depth, strategy is not simply based on preflop equity but integrates risk-reward expected value calculations.

Preflop Strategy

Strategy with AA

AA is an absolute premium hand and should usually be raised or re-raised preflop to build the pot and narrow the opponent's range. At 100BB depth, standard play is:

• Unraised pot: Typically raise 2.5-3BB from early or middle position to isolate weak hands and induce worse hands to call.
• Facing a raise: If someone raises before you, you should 3-bet, usually 3-4 times the original raise size (e.g., facing a 3BB raise, 3-bet to 9-12BB). This forces some speculative hands to fold while maintaining pressure on potential strong hands.
• Facing a 3-bet: If you raise and face a 3-bet, AA should 4-bet or go all-in. Typically 4-bet to 24-30BB, and consider all-in if re-raised. AA rarely folds because of its extremely high preflop equity.

Note: In rare cases, for range balancing, AA can slow-play (flat call), but this should not be overused to avoid losing value.

Strategy with 22

22 is a small pair whose main value comes from flopping a set. Preflop strategy should revolve around implied odds:

• Unraised pot: In position (e.g., button) you can call a standard raise, provided the raise size is small and the opponent has deep stacks. The goal is to see a cheap flop. If the raise is too large (e.g., over 4BB), 22's implied odds are insufficient and you should fold.
• Facing a raise: 22 should generally not raise (except as an occasional bluff) because raising forces weak hands to fold and exposes your range. The more common play is to call, hoping for a multi-way pot to increase the payoff for hitting a set.
• Facing a 3-bet: At 100BB depth, 22 should usually fold to a 3-bet. A 3-bet indicates a strong opponent range; 22's equity is very low, and it requires too many chips to see the flop, making implied odds insufficient. Unless you have a special read or extremely attractive pot odds (e.g., a very small 3-bet), folding is standard.

In summary, 22 is a "cheap flop" hand preflop and should not invest more than 5-8% of the effective stack.

Practical Example

Scenario: 9-handed full ring, effective stacks 100BB. You are on the button. Previous players fold. You hold AA in the hijack? Wait, the example says: "You are on the button, previous players fold, opponent in early position raises 3BB holding AA. Button player calls holding 22." Let's clarify: In the original Chinese, the scenario is: "你在庄位，前面玩家弃牌，你认为对手在枪口位加注 3BB，持有 AA。按钮位玩家跟注，持有 22." So it seems the reader is the button? Actually, the text says "你" (you) in two roles? Possibly a translation issue. We'll adapt: "You are on the button. The player in early position raises 3BB and you suspect they hold AA. You call with 22." Let's read the original carefully: "你在庄位，前面玩家弃牌，你认为对手在枪口位加注 3BB，持有 AA。按钮位玩家跟注，持有 22." That implies "你" is the button player? And the opponent is in early position. So the button player (you) calls with 22. That makes sense. So we'll translate accordingly. Then the analysis for AA is about the raiser's perspective? Actually the analysis gives both sides: "决策分析（AA）" and "决策分析（22）". So we'll present as two separate analyses.

• Decision Analysis (AA): Your raise to 3BB is reasonable. The button calls. Pot is 7.5BB preflop. Postflop, you have top pair. Be aware of the board texture. For example, flop K♠ 8♥ 2♦ gives you top pair top kicker, but the opponent may have flopped a set. You should continuation bet, around 5-6BB, to test the opponent. If the opponent raises, you need to evaluate their range.
• Decision Analysis (22): You call 3BB from the button, investing 3BB to see the flop. Flop K♠ 8♥ 2♦ gives you bottom set (trip 2s). This is the best scenario. The opponent (AA) continuation bets. You can call or raise. Usually raising reveals your strength, but since AA may pay off, a moderate raise (e.g., 15BB) is fine. If the opponent shoves, you should call because a set is very strong on the flop.

This example illustrates how 22 can exploit implied odds to beat AA.

Common Mistakes

Mistake 1: AA always wins

Many beginners think AA is a "sure win", but in fact AA only has about 80% preflop equity postflop and can still be outdrawn by sets, straights, or flushes. Therefore, AA needs to be careful on dangerous boards; don't blindly shove. Especially deep-stacked, a seemingly safe flop (e.g., 8♥ 6♣ 2♦) can still give opponents opportunities.

Mistake 2: 22 should always call AA

22 should only call AA if implied odds are good enough. If the raise is too large (e.g., opponent raises to 10BB), 22's chance of flopping a set is only 12%, and the reward isn't enough to cover the investment. Folding is better. Also, against multiple opponents, you could be beaten by a higher set.

Mistake 3: Preflop equity decides everything

Poker is a dynamic game. Sometimes AA can slow-play deep-stacked to induce bluffs; occasionally 22 can raise to balance range. But the general principle favors straightforward, simple play.

Summary

At 100BB depth, the preflop strategies for AA and 22 illustrate the contrast between direct equity and implied odds. AA should actively raise to build the pot and control odds, while 22 should be selective, only calling when implied odds are sufficient. Remember, poker is not about individual hands but about profiting through expected value over the long run. Correctly evaluating hand strength and scenario is key to profitability.