KK vs JJ Odds: Pocket Kings vs Pocket Jacks

KK Wins

79.3%

JJ Wins

20.7%

Tie

~0%

What are the odds of KK beating JJ?

KK wins 79.3% vs JJ, making it roughly a 4:1 favourite. The approximately 20% win rate for JJ comes primarily from flopping a jack — JJ has exactly 2 outs to make a set, giving it roughly a 10.8% chance on the flop itself. The remaining equity for JJ comes from runner-runner straights and flushes that occasionally materialize when the flop misses both hands but the runout connects for JJ.

How often does JJ flop a set against KK?

JJ has exactly 2 outs — the two remaining jacks in the deck, since JJ accounts for both jacks in the hand. The probability of flopping a jack (at least one of the three flop cards being a jack) is approximately 11.8%. This is identical to any other pocket pair's set-flop probability with 2 outs remaining. When JJ does flop a set, it becomes approximately a 92% favourite to win the hand vs KK.

Should you always get JJ all-in preflop vs a 4-bet?

In most cash game situations, yes — JJ is a top-5 hand and 4-bets typically include a range beyond just KK and AA. If a specific player's 4-bet range is extremely tight (KK-AA only), folding JJ preflop can be correct given the 20.7% equity. Against realistic 4-bet ranges that include AK, QQ, JJ, and occasional bluffs, folding JJ is usually a significant mistake that surrenders substantial expected value over the long run.

What hands does KK crush vs JJ?

All boards without a jack heavily favour KK. Especially dry low boards — K-5-2, Q-7-3 — where KK holds an overpair and JJ has no draw whatsoever. Boards where KK flops a set (K-x-x) make JJ essentially drawing dead: JJ would need runner-runner jacks for quads (impossible, only 2 jacks exist) or a specific backdoor straight or flush. The safest boards for KK vs JJ are low, dry, disconnected boards with no jack.

Is KK vs JJ considered a 'domination'?

No. Domination requires one hand sharing a card with another, severely limiting outs. KK vs JJ is simply pair-over-pair: no shared cards between the hands. JJ has legitimate equity (20.7%) through set-mining potential and straight or flush draws. True domination looks like AA vs AK (87:13) or AK vs AJ (75:25), where the dominated hand shares a key card that is blocked. KK vs JJ is a large favourite, not a domination scenario.

What percentage of hands does JJ win vs all pairs?

JJ's preflop equity vs all other pocket pairs: approximately 20% vs AA, 20.7% vs KK, 22% vs QQ, and 78-80% vs each pair from TT through 22. Against the entire range of all pocket pairs, JJ averages roughly 50% equity in aggregate — balanced by crushing the nine pairs below it and being crushed by the three pairs above it. This is why JJ is sometimes called the most 'balanced' premium pair.

How should you play KK when JJ flops a set on J-x-x?

You likely cannot fold KK on a J-high board in most situations — you hold an overpair and the check-raise range on J-x-x includes not only JJ but also AJ-suited, T9-suited, and potentially KJ. The tricky spots come when JJ check-raises large on J-high boards: KK should generally continue with pot odds but recognize the danger of the situation. In deep-stack cash games with significant stacks remaining, keeping the pot smaller by calling rather than re-raising is sometimes the safer line.