AA vs KK: who wins?

Kings can only win by making a set, a straight, a flush, or a very unlikely board that plays itself. A king flops or runs out often enough to keep the matchup from being a total wipeout, but four out of five times the aces hold. This is also the classic cooler: with aces against you, kings are almost never folding preflop, and they should not be. Losing with kings to aces is not a mistake, it is the price of a hand that is a monster against everything else.

Quick tip: If you have kings and run into aces, you lose a stack. That is normal. The mistake would be playing kings scared everywhere else.

All numbers are all-in preflop equity vs one opponent, computed by the Poker Shark equity engine from the full 169 by 169 hand matrix, weighted across suited and offsuit combos.