What is the win rate of AA vs K6o?

Context: STRATEGY article: aa-vs-k6o-preflop-ev (part 1/2)

Introduction

In Texas Hold'em, AA is widely recognized as the strongest starting hand, while K6o (off-suit K6) is a typical weak hand. The disparity in preflop win rates between the two is enormous, but in actual play, players need to make decisions based on position, stack depth, and opponent tendencies. This article will break down the preflop play of AA versus K6o from three angles: win rate calculation, EV (Expected Value) analysis, and GTO (Game Theory Optimal) strategy, providing actionable practical advice.

Win Rate Comparison: The Math

Assuming a preflop all-in heads-up situation with a standard 52-card deck, ignoring special cases like straight flushes:

• AA vs K6o win rate is approximately 88% vs 12%.
  • AA wins outright in about 88% of cases, with an additional ~2% chance of improving to a flush, straight, or stronger hand.
  • K6o can only overtake by hitting a pair of Kings, a pair of sixes, a straight, or a flush, with a win rate of about 12%.

Note: This assumes a heads-up all-in scenario. If other players are involved, AA's win rate decreases but remains significantly higher than any single high-card combination.

Preflop EV Analysis

EV (Expected Value) is a key metric for long-term profitability. Let's examine a typical 100BB deep stack preflop all-in scenario:

• Assume effective stacks of 100BB, with an initial pot of 1.5BB from blinds.
• If you hold AA and your opponent holds K6o and calls your all-in, your EV calculation is as follows:
  • When you win (88% of the time), you take down the pot (your 100BB + opponent's 100BB + 1.5BB blinds) ≈ 201.5BB.
  • When you lose (12% of the time), you lose 100BB.
  • EV = 0.88 × 201.5 - 0.12 × 100 ≈ 177.32 - 12 = 165.32 BB.
• This means each all-in yields an average long-term profit of about 165 BB, a highly positive EV decision.

Conversely, calling an AA all-in with K6o yields a negative EV (approximately -65.32 BB), leading to severe long-term losses. Therefore, K6o should almost never call an AA all-in.

GTO Perspective on Play

GTO strategy requires achieving Nash equilibrium at every decision point, making it impossible for opponents to exploit you through adjustments.

Playing AA in GTO

• Preflop Raise: AA is a strong hand and should be raised from any position. Standard raise sizes (3-5 big blinds) isolate weak hands while avoiding revealing strength.
• Facing a Raise: AA is one of the few hands worth 3-betting or even 4-betting. In GTO, you should value raise with AA, forcing opponents to commit more chips in unfavorable situations.
• Facing a 3-bet or 4-bet: Generally, you should 5-bet all-in (with deep stacks) or call the flop. Since AA has a massive equity advantage, all-in maximizes EV.

Note: GTO does not require going all-in with AA every time, but any strategy that fails to aggressively raise with AA will be exploited by opponents.

Playing K6o in GTO

K6o is a typical trash hand; under GTO strategy, it is almost always a fold. Reasons:

• Low equity: Against any reasonable raising range, K6o's win rate is below 30%, making calling a long-term negative EV play.
• Poor playability: Even if the flop hits a pair of Kings or sixes, the kicker is weak and often dominated. For example, on a flop of K♠9♦2♣, you have top pair, but opponents may hold AK, KQ, or a larger flush draw than K6.
• Positional disadvantage: The disadvantage is more pronounced when out of position (e.g., big blind vs. under-the-gun raise).

In GTO, K6o only enters the pot in very rare specific situations:

• Small Blind Steal: When effective stacks are very shallow (<15BB) and the big blind's fold rate is extremely high, K6o can be used as a steal raise. Even then, its value is lower than suited connectors or pocket pairs.
• Big Blind Facing a Tiny Raise: For instance, if the cutoff opens to 2BB with 100BB effective stacks, GTO solutions show the big blind can defend about 30% of hands, but K6o is typically not among them. Only against an extremely wide range (e.g., opponent raises more than 60% of the time) might K6o be considered a marginal defense hand.

Practical Advice

When Holding AA:

1. Always raise, regardless of position. Standard open to 4BB from early position, 3-4BB from late position.
2. Facing a 3-bet, 4-bet aggressively. Unless the opponent has an extremely tight 3-bet range (only QQ+, AK), 4-bet to 25-30BB.
3. Don't hesitate to go all-in preflop. AA has over 80% equity against any two cards, making it the best long-term profit play.

When Holding K6o:

1. Fold unless there's a special reason. Even when stealing from the small blind, prioritize hands with higher speculative value like A2o or K5o.
2. Do not call raises. Against any raise (above 2BB), folding is the only positive EV choice.
3. Only consider shoving with very shallow stacks (<10BB) and when in the big blind. For example, if the button shoves and you're in the big blind with favorable pot odds, K6o might be a marginal call, but still inferior to A-X or pocket pairs.

Summary

AA vs K6o is a classic strong vs. weak matchup. Mathematically, AA holds overwhelming dominance, and GTO strategy mandates aggressive use of AA, while K6o is almost always a fold. Remember: in standard preflop situations, do not gamble with K6o, and do not slow-play AA. Keep your play simple and straightforward for consistent long-term profits.

What is AA vs K6o

AA vs K6o is a common search topic in the Texas Hold'em starting hand matrix. The following sections are organized by preflop win rate, stack depth, applicable scenarios, and FAQ for easy reference during table decisions.

Applicable Scenarios

Cash Game — AA vs K6o in deep stack 6-max: open, 3-bet, and post-flop pot control lines.
MTT — Open/jam frequency changes for AA vs K6o under ante and blind structures.
Bubble — ICM inflates fold equity, marginal spots tighten.
Final Table — Payout jumps alter the marginal call/jam decisions for AA vs K6o.

Common Mistakes

Overestimating AA’s actual realization rate
Pre-flop advantage doesn’t guarantee printing across all streets; AA vs K6o is often overvalued post-flop in terms of range, position, and equity realization.

Ignoring positional advantage
With the same AA vs K6o hand, IP vs OOP continue ranges and bet sizing differ completely — do not apply a single line.

Looking only at pre-flop equity, ignoring SPR
Deep stack pot control vs short stack commit decisions, or ICM on the bubble, depend on SPR and payout structure. Jam/call boundaries cannot be based on pre-flop equity% alone.

FAQ

What is AA’s pre-flop win rate vs K6o?
Pre-flop equity varies by position, effective stack, and limp/iso lines. When consulting equity tables, always specify 100BB and whether the pot is heads-up.

At 100BB deep stacked, should I shove AA vs K6o?
Deep stacked default is not to shove. Only consider jamming when SPR is already very low, the range is polarized, or the opponent over-folds. Otherwise, use 3-bet/4-bet to build the pot.

Do decisions for AA vs K6o change on the tournament bubble?
Yes. ICM raises the cost of busting, increasing fold equity. The same hand on the bubble is often easier to fold than in a cash game — do not blindly apply deep stack cash lines.

How does the post-flop board texture affect AA vs K6o?
On dry boards, you can c-bet for value frequently. On wet boards, you need to pot control and watch for K6o’s sets/two pair. AA top pair is not an automatic stack-off.

How do position and SPR change this matchup?
Position alters AA’s continue range and bet sizing vs K6o. When SPR < 4, lean toward committing; when SPR > 8, prioritize pot control and equity realization.

Related Reading

Related Strategy:

• More AA vs K6o strategy

Related Terms:

• gto
• pot-odds

Related Hands:

• AA
• K6o