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Seven2Offsuit

Preflop matchups

KK vs JJ: preflop equity

KK is a big favorite over JJ.

KK

vs

JJ

KK wins

81.3%

Tie

0.4%

JJ wins

18.2%

KK has 81.5% equity, which counts a tie as half a win. The numbers are exact: every one of the 1,712,304 possible boards is counted for each suit combination, not simulated. Suits are shown as examples; the result is averaged over every JJ combination that doesn't share a card with KK.

Try it on a board in the Odds Lab

Questions

Who wins more often, KK or JJ?
KK is a big favorite over JJ. All in before the flop, KK wins 81.3% of the time, JJ wins 18.2% and they tie 0.4%.
What is KK's equity against JJ?
81.5%. Equity counts a tie as half a win, so it is the share of the pot KK takes on average.
Are these odds exact?
Yes. Every one of the 1,712,304 possible five-card boards is counted for each suit combination, so there is no simulation error.