--- title: "JJ vs K9s: preflop equity" url: "https://georgelipoker.com/equity/jj-vs-k9s.md" canonical_url: "https://georgelipoker.com/equity/jj-vs-k9s" last_updated: "2026-10-23" type: "reference" summary: "JJ is a big favorite over K9s before the flop: 68.34% to 31.67% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/jj-vs-a5s.md", "https://georgelipoker.com/equity/jj-vs-a6s.md", "https://georgelipoker.com/equity/tt-vs-k9s.md"] --- # JJ vs K9s: preflop equity JJ is a big favorite over K9s before the flop: 68.34% to 31.67% equity, counted exactly over every board, with the split by flop type and suit. The exact count puts JJ at 68.34% and K9s at 31.66% when the two hands see all five board cards. ## JJ against K9s: the numbers **Exact preflop results for JJ against K9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | JJ | 68.135 | 0.399 | 31.466 | 68.335 | | K9s | 31.466 | 0.399 | 68.135 | 31.665 | One side is a pocket pair, the other is a suited hand. One of the other hand's cards outranks the pair and one is below it, which makes this a closer race than a pair against two small cards. JJ is the clear favorite, though K9s gets there on roughly one board in 3. The tie share is 0.40%: on those boards the pot is chopped and neither hand wins outright. By strength against a random hand, JJ holds place 4 of 169 and K9s holds place 29. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | JJ | 28,000,000 | 164,000 | 12,931,000 | | K9s | 12,931,000 | 164,000 | 28,000,000 | Exact total: 24 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **JJ against K9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | JJ | 2.158 | 1.468 | 3.178 | 0.463 | | K9s | 0.463 | 3.178 | 1.468 | 2.158 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops Across the five flop textures JJ's equity moves by 15.78 points, from 63.58% on monotone flops to 79.36% on low rainbow flops (nine high or lower). JJ stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **JJ against K9s by flop texture, in percent** | Flop | Share of flops | JJ wins | Ties | K9s wins | JJ equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 66.999 | 0.144 | 32.857 | 67.071 | | Rainbow, nine or lower | 7.042 | 78.871 | 0.973 | 20.156 | 79.357 | | Two-tone | 46.545 | 66.401 | 0.304 | 33.295 | 66.553 | | Monotone | 5.212 | 62.379 | 2.392 | 35.229 | 63.575 | | Paired | 17.334 | 71.725 | 0.172 | 28.103 | 71.811 | A rainbow flop shows three suits, a two-tone flop repeats one suit, a monotone flop is a single suit, and a paired flop repeats a rank. ## Compared with a random hand Against one random hand instead, JJ holds 77.47% and K9s holds 59.99%. Facing each other changes that by -9.13 points for JJ and -28.33 points for K9s. **JJ and K9s here compared with each against a random hand, in percent** | Case | Equity here | Against a random hand | Change in points | Times the random-hand equity | | --- | --- | --- | --- | --- | | JJ, all flops | 68.335 | 77.469 | -9.134 | 0.88209 | | JJ, rainbow, ten or higher | 67.071 | 77.469 | -10.398 | 0.86578 | | JJ, rainbow, nine or lower | 79.357 | 77.469 | +1.888 | 1.02437 | | JJ, two-tone | 66.553 | 77.469 | -10.916 | 0.85909 | | JJ, monotone | 63.575 | 77.469 | -13.894 | 0.82065 | | JJ, paired | 71.811 | 77.469 | -5.658 | 0.92696 | | K9s, all flops | 31.665 | 59.988 | -28.323 | 0.52786 | | K9s, rainbow, ten or higher | 32.929 | 59.988 | -27.059 | 0.54893 | | K9s, rainbow, nine or lower | 20.643 | 59.988 | -39.345 | 0.34412 | | K9s, two-tone | 33.447 | 59.988 | -26.541 | 0.55756 | | K9s, monotone | 36.425 | 59.988 | -23.563 | 0.60720 | | K9s, paired | 28.189 | 59.988 | -31.799 | 0.46991 | ## Does a shared suit matter? Does suit overlap move the numbers? JJ has 68.60% when the hands share a suit and 68.07% when they do not. JJ does better with a shared suit, by 0.53 points. **JJ against K9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | JJ wins | Ties | K9s wins | JJ equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 68.384 | 0.440 | 31.176 | 68.604 | | No shared suit | 12 | 50.00 | 67.887 | 0.358 | 31.755 | 68.066 | ## How often this matchup comes up The class pair covers 24 combinations of specific cards in a fixed seat order, 0.0015% of 1,624,350, and 48 (0.0030%) in either order. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says JJ gets $136.68 of it on average and K9s gets $63.32. In 1,000 deals of exactly this matchup, expect about 681 won outright by JJ, about 315 won outright by K9s and about 4 split. ## The same matchup from the other side If you came looking for K9s against JJ, the numbers are the same with the hands swapped: 31.66% and 68.34%. ## Keep exploring Open the calculator with JsJh against Kd9d already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking. - [Open JsJh against Kd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=JsJh&p2=Kd9d) - [JJ combos](https://georgelipoker.com/combos/jj.md) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [JJ vs A5s](https://georgelipoker.com/equity/jj-vs-a5s.md) - [JJ vs A6s](https://georgelipoker.com/equity/jj-vs-a6s.md) - [TT vs K9s](https://georgelipoker.com/equity/tt-vs-k9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 24 deals of JJ against K9s fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [JJ vs A5s: preflop equity](https://georgelipoker.com/equity/jj-vs-a5s.md) - [JJ vs A6s: preflop equity](https://georgelipoker.com/equity/jj-vs-a6s.md) - [TT vs K9s: preflop equity](https://georgelipoker.com/equity/tt-vs-k9s.md)