--- title: "AJs vs A9s: preflop equity" url: "https://georgelipoker.com/equity/ajs-vs-a9s.md" canonical_url: "https://georgelipoker.com/equity/ajs-vs-a9s" last_updated: "2026-10-23" type: "reference" summary: "AJs is a big favorite over A9s before the flop: 70.06% to 29.94% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajs-vs-ato.md", "https://georgelipoker.com/equity/ajs-vs-kjs.md", "https://georgelipoker.com/equity/ako-vs-a9s.md"] --- # AJs vs A9s: preflop equity AJs is a big favorite over A9s before the flop: 70.06% to 29.94% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, AJs takes 70.06% of the pot on average and A9s takes the other 29.94%. ## AJs against A9s: the numbers **Exact preflop results for AJs against A9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJs | 66.506 | 7.113 | 26.381 | 70.063 | | A9s | 26.381 | 7.113 | 66.506 | 29.937 | The matchup is suited hands on both sides, AJs against A9s. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up. That is a clear edge, 70.06% to 29.94%, but A9s still wins often enough that one hand proves nothing. Ties are part of the picture: 7.11% of boards end in a split pot, and each side counts that as half a win. Place 11 of 169 belongs to AJs and place 18 belongs to A9s in the ranking against a random hand. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AJs | 13,665,000 | 1,462,000 | 5,421,000 | | A9s | 5,421,000 | 1,462,000 | 13,665,000 | 12 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand. **AJs 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) | | --- | --- | --- | --- | --- | | AJs | 2.340 | 1.504 | 3.791 | 0.427 | | A9s | 0.427 | 3.791 | 1.504 | 2.340 | The final column gives the least the pot must offer for each unit called for a call to break even at this equity. ## Who is ahead on which flops Break the boards down by their first three cards and AJs is strongest on rainbow flops topped by a ten or better (76.36%) and weakest on low rainbow flops (nine high or lower) (60.19%). AJs stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **AJs against A9s by flop texture, in percent** | Flop | Share of flops | AJs wins | Ties | A9s wins | AJs equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.867 | 73.665 | 5.387 | 20.948 | 76.358 | | Rainbow, nine or lower | 7.042 | 58.088 | 4.198 | 37.714 | 60.187 | | Two-tone | 46.543 | 67.396 | 4.638 | 27.966 | 69.715 | | Monotone | 5.215 | 60.856 | 6.254 | 32.890 | 63.983 | | Paired | 17.333 | 59.382 | 17.578 | 23.040 | 68.171 | 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 Compared with a random opponent, this matchup shifts AJs from 65.39% by +4.67 points and A9s from 62.78% by -32.84 points. **AJs 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 | | --- | --- | --- | --- | --- | | AJs, all flops | 70.063 | 65.393 | +4.670 | 1.07141 | | AJs, rainbow, ten or higher | 76.358 | 65.393 | +10.965 | 1.16768 | | AJs, rainbow, nine or lower | 60.187 | 65.393 | -5.206 | 0.92039 | | AJs, two-tone | 69.715 | 65.393 | +4.322 | 1.06609 | | AJs, monotone | 63.983 | 65.393 | -1.410 | 0.97844 | | AJs, paired | 68.171 | 65.393 | +2.778 | 1.04248 | | A9s, all flops | 29.937 | 62.781 | -32.844 | 0.47685 | | A9s, rainbow, ten or higher | 23.642 | 62.781 | -39.139 | 0.37658 | | A9s, rainbow, nine or lower | 39.813 | 62.781 | -22.968 | 0.63416 | | A9s, two-tone | 30.285 | 62.781 | -32.496 | 0.48239 | | A9s, monotone | 36.017 | 62.781 | -26.764 | 0.57369 | | A9s, paired | 31.829 | 62.781 | -30.952 | 0.50698 | ## Does a shared suit matter? These two classes cannot share a suit in any legal deal, so there is only one row to read: AJs holds 70.06% in every deal of this matchup. **AJs against A9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJs wins | Ties | A9s wins | AJs equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 66.506 | 7.113 | 26.381 | 70.063 | ## How often this matchup comes up Out of 1,624,350 ways to deal two seats two cards each, 12 are AJs in one seat and A9s in the other (0.0007%); with the seats swapped too, 24 (0.0015%). ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. AJs is worth $140.12 on average (+$40.12); A9s is worth $59.88 (-$40.12). Run 1,000 deals and the tally comes out near 665 for AJs, 264 for A9s and 71 ties. ## The same matchup from the other side The mirror image, A9s against AJs, is 29.94% to 70.06%, and its address redirects to this page. ## Keep exploring Try AsJs against Ah9h 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 AsJs against Ah9h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJs&p2=Ah9h) - [AJs combos](https://georgelipoker.com/combos/ajs.md) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [AJs vs ATo](https://georgelipoker.com/equity/ajs-vs-ato.md) - [AJs vs KJs](https://georgelipoker.com/equity/ajs-vs-kjs.md) - [AKo vs A9s](https://georgelipoker.com/equity/ako-vs-a9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed All 1,712,304 five-card boards are dealt for every suit pattern among the 12 specific deals of AJs against A9s, and both hands are scored on each. That is a full count, so the percentages are exact. Ties are half a win each, and each board appears once per flop it contains. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJs vs ATo: preflop equity](https://georgelipoker.com/equity/ajs-vs-ato.md) - [AJs vs KJs: preflop equity](https://georgelipoker.com/equity/ajs-vs-kjs.md) - [AKo vs A9s: preflop equity](https://georgelipoker.com/equity/ako-vs-a9s.md)