--- title: "A9s vs T9o: preflop equity" url: "https://georgelipoker.com/equity/a9s-vs-t9o.md" canonical_url: "https://georgelipoker.com/equity/a9s-vs-t9o" last_updated: "2026-10-23" type: "reference" summary: "A9s is a big favorite over T9o before the flop: 70.81% to 29.19% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9s-vs-98s.md", "https://georgelipoker.com/equity/a9s-vs-22.md", "https://georgelipoker.com/equity/ato-vs-t9o.md"] --- # A9s vs T9o: preflop equity A9s is a big favorite over T9o before the flop: 70.81% to 29.19% equity, counted exactly over every board, with the split by flop type and suit. Counting every board, the equity split is 70.81% for A9s and 29.19% for T9o, so A9s leads by 41.62 points. ## A9s against T9o: the numbers **Exact preflop results for A9s against T9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9s | 69.936 | 1.741 | 28.323 | 70.806 | | T9o | 28.323 | 1.741 | 69.936 | 29.194 | We compare a suited hand with an offsuit hand. 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, 70.81% to 29.19%, but T9o still wins often enough that one hand proves nothing. A split pot comes up on 1.74% of boards, so the wins and the equity differ by half of that. The hand ranking puts A9s at 18 and T9o at 78 out of 169 starting hands. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A9s | 43,111,000 | 1,073,000 | 17,459,000 | | T9o | 17,459,000 | 1,073,000 | 43,111,000 | The board total is exact, 36 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **A9s against T9o read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | A9s | 2.425 | 1.430 | 3.531 | 0.412 | | T9o | 0.412 | 3.531 | 1.430 | 2.425 | 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 A9s prefers low rainbow flops (nine high or lower), where it holds 78.69%, and likes monotone flops least, where it holds 64.16%. A9s stays ahead on all five textures. **A9s against T9o by flop texture, in percent** | Flop | Share of flops | A9s wins | Ties | T9o wins | A9s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.634 | 66.681 | 1.600 | 31.719 | 67.481 | | Rainbow, nine or lower | 6.314 | 77.785 | 1.799 | 20.416 | 78.685 | | Two-tone | 46.527 | 69.674 | 1.500 | 28.826 | 70.424 | | Monotone | 5.192 | 62.648 | 3.022 | 34.330 | 64.159 | | Paired | 17.333 | 74.590 | 2.182 | 23.228 | 75.681 | 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, A9s holds 62.78% and T9o holds 51.53%. Facing each other changes that by +8.03 points for A9s and -22.34 points for T9o. **A9s and T9o 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 | | --- | --- | --- | --- | --- | | A9s, all flops | 70.806 | 62.781 | +8.025 | 1.12783 | | A9s, rainbow, ten or higher | 67.481 | 62.781 | +4.700 | 1.07486 | | A9s, rainbow, nine or lower | 78.685 | 62.781 | +15.904 | 1.25333 | | A9s, two-tone | 70.424 | 62.781 | +7.643 | 1.12174 | | A9s, monotone | 64.159 | 62.781 | +1.378 | 1.02195 | | A9s, paired | 75.681 | 62.781 | +12.900 | 1.20548 | | T9o, all flops | 29.194 | 51.532 | -22.338 | 0.56652 | | T9o, rainbow, ten or higher | 32.519 | 51.532 | -19.013 | 0.63104 | | T9o, rainbow, nine or lower | 21.315 | 51.532 | -30.217 | 0.41363 | | T9o, two-tone | 29.576 | 51.532 | -21.956 | 0.57393 | | T9o, monotone | 35.841 | 51.532 | -15.691 | 0.69551 | | T9o, paired | 24.319 | 51.532 | -27.213 | 0.47192 | ## Does a shared suit matter? When the hands share a suit, A9s holds 70.49%; when they do not, it holds 70.97%. A9s does better with no shared suit, by 0.48 points. **A9s against T9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9s wins | Ties | T9o wins | A9s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 33.33 | 69.563 | 1.848 | 28.589 | 70.487 | | No shared suit | 24 | 66.67 | 70.123 | 1.687 | 28.190 | 70.966 | ## How often this matchup comes up Out of 1,624,350 ways to deal two seats two cards each, 36 are A9s in one seat and T9o in the other (0.0022%); with the seats swapped too, 72 (0.0044%). ## A worked example With $100 from each side, the $200 pot is split on average as $141.62 for A9s and $58.38 for T9o; the first side gains $41.62 per all-in and the second gives up $41.62. Run 1,000 deals and the tally comes out near 699 for A9s, 283 for T9o and 18 ties. ## The same matchup from the other side Read it from the other side: T9o against A9s is the same matchup with the numbers swapped, so T9o holds 29.19% and A9s holds 70.81%. That address sends you back to this page. ## Keep exploring The calculator link fills in As9s against Th9d, a deal where the two hands share no suit. Change any card to test your own hand. The neighboring matchups below swap one of the two hands for one of similar strength. - [Open As9s against Th9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9s&p2=Th9d) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [T9o combos](https://georgelipoker.com/combos/t9o.md) - [A9s vs 98s](https://georgelipoker.com/equity/a9s-vs-98s.md) - [A9s vs 22](https://georgelipoker.com/equity/a9s-vs-22.md) - [ATo vs T9o](https://georgelipoker.com/equity/ato-vs-t9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 36 ways to deal one A9s and one T9o 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 - [A9s vs 98s: preflop equity](https://georgelipoker.com/equity/a9s-vs-98s.md) - [A9s vs 22: preflop equity](https://georgelipoker.com/equity/a9s-vs-22.md) - [ATo vs T9o: preflop equity](https://georgelipoker.com/equity/ato-vs-t9o.md)