AA vs KK: What is the Win Rate?

Introduction

At a short stack depth of 20BB (20 big blinds), preflop decisions often determine the outcome of the entire hand. AA and KK, as the top two hands, generally tend to go all-in, but there are still differences in win rate, performance against different ranges, and preflop action details. This article provides clear strategic references for players through comparison tables and itemized analysis.

Comparison Table

Detailed Itemized Comparison

Win Rate

When AA and KK face off heads-up preflop, AA's win rate is about 82%, and KK's is about 18% (without considering suitedness or board structure). This means AA wins more than 4 out of every 5 confrontations. Against random cards or unknown ranges, AA's win rate is about 85%, and KK's is about 82%. Although the gap is small, it is enough to influence decisions.

Preflop Action Recommendation

• AA: At 20BB short stacks, AA is absolute power. In any position, with any action, AA should unconditionally go all-in or make a normal raise and then call the opponent's all-in. Slow-playing is pointless because the postflop SPR (stack-to-pot ratio) is extremely low, and AA's equity is ahead on any board.
• KK: KK is also very strong, but it has one nemesis: AA. When the opponent is a tight-passive player or clearly only willing to go all-in with AA+, KK's win rate drops sharply to about 18%. Generally, at 20BB, KK is still recommended to go all-in because the probability of the opponent holding AA is low (about 0.45%), and most players will go all-in with JJ+, AK, etc. However, if there is a very clear read (e.g., the opponent never folds to a short-stack 3bet and only goes all-in with AA), KK can consider folding.

Reaction to 3bet or 4bet

• AA: Any 3bet or 4bet from the opponent is good news. AA always goes all-in directly, or 4bets and then calls the all-in. No thinking required.
• KK: After the opponent 3bets, KK usually goes all-in directly. If the opponent 4bets, KK still tends to go all-in because the opponent's 4bet range usually includes QQ+, AK, and KK has an advantage. Exception: When the opponent is an extremely conservative player whose 4bet range is only KK+, then KK's win rate against AA+ is only about 23% (including suited combinations and size), which is still close to 1/4, but if the pot odds are unfavorable (e.g., needing to invest a large amount of chips), folding can be considered. However, at 20BB, after the opponent's 4bet, the pot already accounts for a large proportion, and KK almost always has sufficient pot odds to call or go all-in.

Opponent Range Assumptions

• AA: No assumptions needed; AA dominates all starting hands.
• KK: Need to assume the opponent's all-in or 3bet range. If the opponent's range includes AK, QQ, JJ, or even worse, KK's win rate is well above 50%. But if the opponent's range is limited to KK+, then KK is at a significant disadvantage. In actual 20BB play, most players have a wide range, so KK can dominate.

Raise Size Preference

• AA: The simplest approach is to go all-in directly for 22BB (including the big blind), avoiding complex raise sizes. Alternatively, a small raise size (e.g., min-raise) can be used to induce the opponent to re-raise, but all-in is more straightforward.
• KK: All-in is also recommended, but standard 3bet (2.5-3BB) or 4bet (6-8BB) can be used. Note: if all-in is called, KK's win rate is high enough; if the opponent folds, the pot is taken directly.

Respective Advantages

• Advantages of AA: Unmatched preflop win rate (against any opponent, any stack depth); no need to read people, no need to think, simple and brutal. At 20BB, AA's preflop equity is over 82%, and even against the strongest opponent KK, it holds an overwhelming edge.
• Advantages of KK: Second to AA, but stronger than all other starting hands. At 20BB short stacks, KK's preflop win rate is still around 82%, and players often overestimate the probability of AA appearing while underestimating KK's value. KK is the second safest hand to go all-in preflop, easily squeezing ranges like QQ and AK.

Recommended Scenarios

• AA: Applicable to all 20BB scenarios. Whether in early, middle, or late position, facing any number of opponents, AA should unconditionally commit all chips.
• KK: Applicable to most 20BB scenarios. It is recommended to go all-in in the following situations:
  • Opponent is aggressive or unknown.
  • Opponent's range is wide (common at low stakes).
  • You are in a favorable position and have information suggesting the opponent's range is weak. In rare cases where the opponent is extremely conservative and you have a clear read, folding can be considered. However, without solid evidence, going all-in with KK is positive expected value.

Conclusion

At 20BB short stack depth, both AA and KK tend to go all-in preflop. AA is the absolute preflop king, and any hesitation is a loss; KK is a slightly lesser powerhouse that should usually go all-in, but must be cautious against extremely tight players. Understanding the differences in win rate and range assumptions helps maximize long-term profits in short-stack situations. Remember, AA should never be folded, and KK should almost never be folded — unless you are willing to believe the opponent only goes all-in with AA.

What is AA vs KK

AA vs KK is a common search topic in Texas Hold'em preflop / starting hands. The following is organized by preflop win rate, stack depth, applicable scenarios, and FAQ, for direct reference at the table.

Applicable Scenarios

Cash Games — AA vs KK in deep-stack 6-max open, 3-bet, and postflop pot control lines.
MTT — Changes in open/jam frequency for AA vs KK under ante and blind structures.
Bubble — ICM raises fold equity, tightening marginal spots.
Final Table — Payout jumps alter the marginal for call/jam involving AA vs KK.

Common Mistakes

Overestimating AA's Actual Equity Realization
Being ahead preflop does not equal profit across the entire line; AA vs KK is often overestimated in postflop range, position, and equity realization.

Ignoring Position Advantage
In the same AA vs KK scenario, the continuation range and bet sizing differ completely between IP and OOP; do not use the same line blindly.

Looking Only at Preflop Equity, Not SPR
Under deep-stack pot control, short-stack commit, and bubble ICM situations, SPR and payout structure determine the jam/call boundary; you cannot rely solely on preflop equity%.

FAQ

What is AA vs KK preflop win rate?
Preflop equity varies with position, effective stack, and limp/iso lines; when referencing equity tables, always specify 20BB and whether the pot is heads-up.

At 20BB deep stacked, should AA shove against KK?
Default deep stack is not a shove; only consider jamming when SPR is already low, range is polarized, or the opponent over-folds in the spot. More often, use 3-bet/4-bet to build the pot.

In a tournament bubble, does the decision for AA vs KK differ?
Yes. ICM raises the cost of busting, increasing fold equity; the same hand is often more likely to fold in the bubble compared to a cash game, so do not apply deep-stack cash lines directly.

How does flop texture affect AA vs KK?
On dry flops, high-frequency c-bets for value are viable; on wet flops, control the pot and watch out for KK’s set/two pair. AA top pair is not an automatic stack off.

How do position and SPR change this matchup?
In the BB position, AA’s open/3-bet range and OOP defense lines should be evaluated separately. When SPR < 4, tend to commit; when SPR > 8, focus on pot control and equity realization.

Related Reading

Related Strategies:

• AA vs QQ win rate?
• AA vs K3s win rate?
• AA vs JTs win rate?
• AA vs KQs win rate?
• AA vs 88 win rate?
• AA vs A7s win rate?

Related Terms:

• gto
• pot-odds

Related Hands:

• AA
• KK