KK vs A5s

When KK and A5s get all in before the flop, KK wins 66.7% of the time and A5s takes 33.3%. Broken down, KK wins outright 66.5%, chops 0.4% and loses 33.1% — a margin of 33.4 points. Pair against one overcard — roughly 70/30 in the pair's favour.

The same matchup shifts depending on how the suits overlap. With no shared suit the number is 66.5% (for example Ks Kh against Ad 5d); with one shared suit it is 66.9% (Ks Kh against As 5s). That is a spread of 0.39 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 57.2%, A5s 29.0%, random 13.8%. KK gives up 9.5 points and A5s gives up 4.3, 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 A5s is worth 59.8% (rank 32). The gap between them in the ranking is only 22.7 points, yet head to head the gap is 33.4 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 66 pots, splits about one, and loses the remaining 33. Against eight random opponents rather than this one specific hand, KK would be down to 29.6% and A5s to 15.6%, so the shape of this particular confrontation matters far more than either hand's standing in the overall ranking.

From A5s's side, 33.3% is the break-even point for calling an all-in at 2:1 pot odds. Put another way, the call is profitable as long as the amount you have to put in is less than 33.3% of the pot you are playing for. KK holds the other 66.7% 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 A5s really does hold exactly A5s; against the wider range a player would actually get all in with, KK's 66.7% moves. Use the individual pages for KK and A5s to see how each of them fares against all 168 other holdings before treating this single pairing as the whole picture.

When the three flop cards are out, KK is ahead 81.7% of the time and A5s 18.3%, and the two hands are never level on the flop. "Ahead" means the better best-five-card hand from the cards showing plus the two hole cards; draws are not counted.

When KK leads on the flop, A5s comes back on the turn and river 20.7% of the time. When A5s leads on the flop, KK turns it around 11.3% of the time. The hand in front holds on to win 80.5% of the time from the flop and 88.6% from the turn (level spots left out).

With the turn out, KK leads 74.3% and A5s 25.7%. Counted exhaustively, KK finishes with 66.66% equity (the 66.7% at the top of the page is a 200,000-hand simulation).