KK vs 54s

When KK and 54s get all in before the flop, KK wins 77.4% of the time and 54s takes 22.6%. Broken down, KK wins outright 77.2%, chops 0.5% and loses 22.3% — a margin of 54.9 points. Overpair against two undercards — about 80/20 for the pair.

The same matchup shifts depending on how the suits overlap. With no shared suit the number is 76.9% (for example Ks Kh against 5d 4d); with one shared suit it is 78.0% (Ks Kh against 5s 4s). That is a spread of 1.02 points across the 24 distinct card combinations, and it comes almost entirely from whether the two hands are fighting over the same flush.

Add a third player holding a random hand and the split becomes KK 64.9%, 54s 20.2%, random 14.9%. KK gives up 12.6 points and 54s gives up 2.3, so the favourite loses more than the underdog does. Extra players always eat into the leader's share faster than into anyone else's.

Taken on their own, KK is worth 82.5% against a random hand (rank 2 of 169) and 54s is worth 41.4% (rank 138). The gap between them in the ranking is only 41.1 points, yet head to head the gap is 54.9 points — a reminder that a ranking table and a direct matchup are two different questions.

Framed as a run of one hundred identical all-ins, KK scoops roughly 77 pots, splits about one, and loses the remaining 22. Against eight random opponents rather than this one specific hand, KK would be down to 29.6% and 54s to 12.6%, so the shape of this particular confrontation matters far more than either hand's standing in the overall ranking.

From 54s's side, 22.6% is the break-even point for calling an all-in at 3.42:1 pot odds. Put another way, the call is profitable as long as the amount you have to put in is less than 22.6% of the pot you are playing for. KK holds the other 77.4% of that same pot.

Two caveats keep this figure honest. First, it is showdown equity across all 24 card combinations with five board cards still to come — there is no fold equity in it, so the value of shoving in practice is usually higher than the raw percentage suggests. Second, it assumes 54s really does hold exactly 54s; against the wider range a player would actually get all in with, KK's 77.4% moves. Use the individual pages for KK and 54s to see how each of them fares against all 168 other holdings before treating this single pairing as the whole picture.