JJ vs 87s

When JJ and 87s get all in before the flop, JJ wins 78.9% of the time and 87s takes 21.1%. Broken down, JJ wins outright 78.7%, chops 0.4% and loses 20.9% — a margin of 57.9 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 78.5% (for example Js Jh against 8d 7d); with one shared suit it is 79.4% (Js Jh against 8s 7s). That is a spread of 0.83 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 JJ 61.8%, 87s 19.3%, random 18.9%. JJ gives up 17.2 points and 87s gives up 1.8, 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, JJ is worth 77.5% against a random hand (rank 4 of 169) and 87s is worth 47.9% (rank 101). The gap between them in the ranking is only 29.6 points, yet head to head the gap is 57.9 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, JJ scoops roughly 79 pots, splits about one, and loses the remaining 21. Against eight random opponents rather than this one specific hand, JJ would be down to 21.7% and 87s to 14.0%, so the shape of this particular confrontation matters far more than either hand's standing in the overall ranking.

From 87s's side, 21.1% is the break-even point for calling an all-in at 3.74:1 pot odds. Put another way, the call is profitable as long as the amount you have to put in is less than 21.1% of the pot you are playing for. JJ holds the other 78.9% 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 87s really does hold exactly 87s; against the wider range a player would actually get all in with, JJ's 78.9% moves. Use the individual pages for JJ and 87s to see how each of them fares against all 168 other holdings before treating this single pairing as the whole picture.