--- title: "AA vs A9s: preflop equity" url: "https://georgelipoker.com/equity/aa-vs-a9s.md" canonical_url: "https://georgelipoker.com/equity/aa-vs-a9s" last_updated: "2026-10-23" type: "reference" summary: "AA is a big favorite over A9s before the flop: 88.43% to 11.57% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/aa-vs-ato.md", "https://georgelipoker.com/equity/aa-vs-kjs.md", "https://georgelipoker.com/equity/kk-vs-a9s.md"] --- # AA vs A9s: preflop equity AA is a big favorite over A9s before the flop: 88.43% to 11.57% equity, counted exactly over every board, with the split by flop type and suit. Over all 1,712,304 boards that can follow this deal, AA finishes with 88.43% of the pot and A9s with 11.57%. ## AA against A9s: the numbers **Exact preflop results for AA against A9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AA | 87.776 | 1.313 | 10.911 | 88.432 | | A9s | 10.911 | 1.313 | 87.776 | 11.568 | We compare a pocket pair with a suited hand. The non-pair hand shares a rank with the pair, so two of its outs for pairing are blocked by the pair itself. AA is a big favorite here before anyone sees a flop. A split pot comes up on 1.31% of boards, so the wins and the equity differ by half of that. Place 1 of 169 belongs to AA 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 | | --- | --- | --- | --- | | AA | 18,036,000 | 270,000 | 2,242,000 | | A9s | 2,242,000 | 270,000 | 18,036,000 | Exact total: 12 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. **AA 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) | | --- | --- | --- | --- | --- | | AA | 7.645 | 1.139 | 9.165 | 0.131 | | A9s | 0.131 | 9.165 | 1.139 | 7.645 | 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 AA prefers rainbow flops topped by a ten or better, where it holds 92.70%, and likes monotone flops least, where it holds 78.04%. AA stays ahead on all five textures. **AA against A9s by flop texture, in percent** | Flop | Share of flops | AA wins | Ties | A9s wins | AA equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.740 | 92.088 | 1.221 | 6.691 | 92.698 | | Rainbow, nine or lower | 7.042 | 88.784 | 2.635 | 8.581 | 90.102 | | Two-tone | 46.236 | 86.318 | 1.384 | 12.298 | 87.010 | | Monotone | 5.151 | 76.863 | 2.357 | 20.780 | 78.042 | | Paired | 17.831 | 88.569 | 0.430 | 11.001 | 88.784 | 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, AA holds 85.20% and A9s holds 62.78%. Facing each other changes that by +3.23 points for AA and -51.21 points for A9s. **AA 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 | | --- | --- | --- | --- | --- | | AA, all flops | 88.432 | 85.204 | +3.228 | 1.03789 | | AA, rainbow, ten or higher | 92.698 | 85.204 | +7.494 | 1.08795 | | AA, rainbow, nine or lower | 90.102 | 85.204 | +4.898 | 1.05749 | | AA, two-tone | 87.010 | 85.204 | +1.806 | 1.02120 | | AA, monotone | 78.042 | 85.204 | -7.162 | 0.91594 | | AA, paired | 88.784 | 85.204 | +3.580 | 1.04202 | | A9s, all flops | 11.568 | 62.781 | -51.213 | 0.18426 | | A9s, rainbow, ten or higher | 7.302 | 62.781 | -55.479 | 0.11631 | | A9s, rainbow, nine or lower | 9.898 | 62.781 | -52.883 | 0.15766 | | A9s, two-tone | 12.990 | 62.781 | -49.791 | 0.20691 | | A9s, monotone | 21.958 | 62.781 | -40.823 | 0.34976 | | A9s, paired | 11.216 | 62.781 | -51.565 | 0.17865 | ## Does a shared suit matter? Suits do not split this matchup, because no legal deal has the hands holding the same suit. **AA against A9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | AA wins | Ties | A9s wins | AA equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 87.776 | 1.313 | 10.911 | 88.432 | ## How often this matchup comes up You will meet this exact matchup 0.0015% of the time in a random heads-up deal: 24 of 1,624,350, counting either seat order. ## A worked example Take a $200 pot built from $100 each. AA's equity of 88.43% is worth $176.86, a $76.86 edge, and A9s' 11.57% is worth $23.14, which is $76.86 under its stake. Run 1,000 deals and the tally comes out near 878 for AA, 109 for A9s and 13 ties. ## The same matchup from the other side The mirror image, A9s against AA, is 11.57% to 88.43%, and its address redirects to this page. ## Keep exploring AsAh against Ad9d is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open AsAh against Ad9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsAh&p2=Ad9d) - [AA combos](https://georgelipoker.com/combos/aa.md) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [AA vs ATo](https://georgelipoker.com/equity/aa-vs-ato.md) - [AA vs KJs](https://georgelipoker.com/equity/aa-vs-kjs.md) - [KK vs A9s](https://georgelipoker.com/equity/kk-vs-a9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 12 ways to deal one AA and one A9s without reusing a card, grouped by suit pattern, every one of the 1,712,304 possible boards is dealt and both seven-card hands are compared. A tie counts as half a win in the equity column, and each board is counted once under each of its ten three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AA vs ATo: preflop equity](https://georgelipoker.com/equity/aa-vs-ato.md) - [AA vs KJs: preflop equity](https://georgelipoker.com/equity/aa-vs-kjs.md) - [KK vs A9s: preflop equity](https://georgelipoker.com/equity/kk-vs-a9s.md)