--- title: "JJ vs A9s: preflop equity" url: "https://georgelipoker.com/equity/jj-vs-a9s.md" canonical_url: "https://georgelipoker.com/equity/jj-vs-a9s" last_updated: "2026-10-23" type: "reference" summary: "JJ is a big favorite over A9s before the flop: 68.44% to 31.56% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/jj-vs-ato.md", "https://georgelipoker.com/equity/jj-vs-kjs.md", "https://georgelipoker.com/equity/tt-vs-a9s.md"] --- # JJ vs A9s: preflop equity JJ is a big favorite over A9s before the flop: 68.44% to 31.56% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, JJ takes 68.44% of the pot on average and A9s takes the other 31.56%. ## JJ against A9s: the numbers **Exact preflop results for JJ against A9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | JJ | 68.249 | 0.390 | 31.361 | 68.444 | | A9s | 31.361 | 0.390 | 68.249 | 31.556 | JJ, a pocket pair, plays A9s, a suited hand. The pair sits between the other hand's two cards: one is higher and one is lower, so the pair is exposed to the higher card. JJ is well ahead, and A9s needs a specific kind of board to catch up. 0.39% of boards are ties, so the equity of each hand is its win rate plus half of that. Among the 169 starting hands, JJ is number 4 and A9s is number 18 by strength against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | JJ | 28,047,000 | 160,000 | 12,888,000 | | A9s | 12,888,000 | 160,000 | 28,047,000 | The total is exact: 24 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **JJ against A9s 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 | 2.169 | 1.465 | 3.189 | 0.461 | | A9s | 0.461 | 3.189 | 1.465 | 2.169 | In the last column, a pot-to-call ratio at or above the figure makes a call break even or better at this equity. ## Who is ahead on which flops Low rainbow flops (nine high or lower) are the best for JJ (77.88%); monotone flops are the worst (63.76%). JJ stays ahead on all five textures. **JJ against A9s by flop texture, in percent** | Flop | Share of flops | JJ wins | Ties | A9s wins | JJ equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 67.659 | 0.140 | 32.201 | 67.729 | | Rainbow, nine or lower | 7.042 | 77.405 | 0.947 | 21.648 | 77.879 | | Two-tone | 46.545 | 66.563 | 0.297 | 33.140 | 66.712 | | Monotone | 5.212 | 62.566 | 2.389 | 35.045 | 63.760 | | Paired | 17.334 | 71.577 | 0.156 | 28.267 | 71.655 | Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank. ## Compared with a random hand Against one random hand instead, JJ holds 77.47% and A9s holds 62.78%. Facing each other changes that by -9.03 points for JJ and -31.22 points for A9s. **JJ and A9s 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 | 68.444 | 77.469 | -9.025 | 0.88350 | | JJ, rainbow, ten or higher | 67.729 | 77.469 | -9.740 | 0.87427 | | JJ, rainbow, nine or lower | 77.879 | 77.469 | +0.410 | 1.00529 | | JJ, two-tone | 66.712 | 77.469 | -10.757 | 0.86114 | | JJ, monotone | 63.760 | 77.469 | -13.709 | 0.82304 | | JJ, paired | 71.655 | 77.469 | -5.814 | 0.92495 | | A9s, all flops | 31.556 | 62.781 | -31.225 | 0.50264 | | A9s, rainbow, ten or higher | 32.271 | 62.781 | -30.510 | 0.51402 | | A9s, rainbow, nine or lower | 22.121 | 62.781 | -40.660 | 0.35235 | | A9s, two-tone | 33.288 | 62.781 | -29.493 | 0.53022 | | A9s, monotone | 36.240 | 62.781 | -26.541 | 0.57724 | | A9s, paired | 28.345 | 62.781 | -34.436 | 0.45149 | ## Does a shared suit matter? Of the deals of this matchup, 12 share a suit (JJ at 68.73%) and 12 do not (68.16%). JJ does better with a shared suit, by 0.57 points. **JJ against A9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | JJ wins | Ties | A9s wins | JJ equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 68.516 | 0.431 | 31.053 | 68.732 | | No shared suit | 12 | 50.00 | 67.982 | 0.348 | 31.670 | 68.156 | ## How often this matchup comes up You will meet this exact matchup 0.0030% of the time in a random heads-up deal: 48 of 1,624,350, counting either seat order. ## A worked example With $100 from each side, the $200 pot is split on average as $136.88 for JJ and $63.12 for A9s; the first side gains $36.88 per all-in and the second gives up $36.88. Over a long run, 1,000 deals split into about 682 for JJ, 314 for A9s and 4 tied. ## The same matchup from the other side One page covers both views. From A9s' side the equity is 31.56%, and from JJ's side it is 68.44%. ## Keep exploring Try JsJh against Ad9d in the calculator: the hands share no suit, and every card can be changed. The links after it are the closest matchups in the ranking. - [Open JsJh against Ad9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=JsJh&p2=Ad9d) - [JJ combos](https://georgelipoker.com/combos/jj.md) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [JJ vs ATo](https://georgelipoker.com/equity/jj-vs-ato.md) - [JJ vs KJs](https://georgelipoker.com/equity/jj-vs-kjs.md) - [TT vs A9s](https://georgelipoker.com/equity/tt-vs-a9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 24 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [JJ vs ATo: preflop equity](https://georgelipoker.com/equity/jj-vs-ato.md) - [JJ vs KJs: preflop equity](https://georgelipoker.com/equity/jj-vs-kjs.md) - [TT vs A9s: preflop equity](https://georgelipoker.com/equity/tt-vs-a9s.md)