--- title: "A9o vs T9s: preflop equity" url: "https://georgelipoker.com/equity/a9o-vs-t9s.md" canonical_url: "https://georgelipoker.com/equity/a9o-vs-t9s" last_updated: "2026-10-23" type: "reference" summary: "A9o is a big favorite over T9s before the flop: 65.57% to 34.43% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/a9o-vs-33.md", "https://georgelipoker.com/equity/a9o-vs-t8s.md", "https://georgelipoker.com/equity/kjo-vs-t9s.md"] --- # A9o vs T9s: preflop equity A9o is a big favorite over T9s before the flop: 65.57% to 34.43% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, A9o is ahead of T9s by 31.14 points of equity, 65.57% to 34.43%. ## A9o against T9s: the numbers **Exact preflop results for A9o against T9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A9o | 64.683 | 1.777 | 33.540 | 65.572 | | T9s | 33.540 | 1.777 | 64.683 | 34.428 | A9o and T9s are an offsuit hand and a suited hand, in that order. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up. A9o is well ahead, and T9s needs a specific kind of board to catch up. The tie share is 1.78%: on those boards the pot is chopped and neither hand wins outright. The hand ranking puts A9o at 25 and T9s at 64 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 | | --- | --- | --- | --- | | A9o | 39,873,000 | 1,095,000 | 20,675,000 | | T9s | 20,675,000 | 1,095,000 | 39,873,000 | 36 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. **A9o against T9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | A9o | 1.905 | 1.546 | 2.982 | 0.525 | | T9s | 0.525 | 2.982 | 1.546 | 1.905 | 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 Across the five flop textures A9o's equity moves by 13.29 points, from 61.90% on monotone flops to 75.19% on low rainbow flops (nine high or lower). A9o stays ahead on all five textures. **A9o against T9s by flop texture, in percent** | Flop | Share of flops | A9o wins | Ties | T9s wins | A9o equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.634 | 63.547 | 1.617 | 34.836 | 64.355 | | Rainbow, nine or lower | 6.314 | 74.280 | 1.825 | 23.895 | 75.193 | | Two-tone | 46.527 | 62.681 | 1.553 | 35.766 | 63.457 | | Monotone | 5.192 | 60.352 | 3.101 | 36.547 | 61.902 | | Paired | 17.333 | 69.472 | 2.196 | 28.332 | 70.570 | 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 Start from the random-hand figures, 60.77% for A9o and 54.03% for T9s. This opponent changes them by +4.80 and -19.60 points. **A9o and T9s 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 | | --- | --- | --- | --- | --- | | A9o, all flops | 65.572 | 60.773 | +4.799 | 1.07897 | | A9o, rainbow, ten or higher | 64.355 | 60.773 | +3.582 | 1.05894 | | A9o, rainbow, nine or lower | 75.193 | 60.773 | +14.420 | 1.23728 | | A9o, two-tone | 63.457 | 60.773 | +2.684 | 1.04416 | | A9o, monotone | 61.902 | 60.773 | +1.129 | 1.01858 | | A9o, paired | 70.570 | 60.773 | +9.797 | 1.16121 | | T9s, all flops | 34.428 | 54.028 | -19.600 | 0.63723 | | T9s, rainbow, ten or higher | 35.645 | 54.028 | -18.383 | 0.65975 | | T9s, rainbow, nine or lower | 24.807 | 54.028 | -29.221 | 0.45915 | | T9s, two-tone | 36.543 | 54.028 | -17.485 | 0.67637 | | T9s, monotone | 38.098 | 54.028 | -15.930 | 0.70515 | | T9s, paired | 29.430 | 54.028 | -24.598 | 0.54472 | ## Does a shared suit matter? The suit split reads 66.59% for A9o with a shared suit and 65.06% without one. A9o does better with a shared suit, by 1.53 points. **A9o against T9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | A9o wins | Ties | T9s wins | A9o equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 33.33 | 65.663 | 1.848 | 32.489 | 66.587 | | No shared suit | 24 | 66.67 | 64.192 | 1.743 | 34.065 | 65.064 | ## How often this matchup comes up This page stands for 36 specific-card matchups (0.0022% of 1,624,350 ordered deals), or 72 once you count the seats both ways (0.0044%). ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, A9o's average share is $131.14 (a gain of $31.14) and T9s' is $68.86 (a loss of $31.14). A thousand deals look like this: A9o takes 647, T9s takes 335, 18 are ties. ## The same matchup from the other side One page covers both views. From T9s' side the equity is 34.43%, and from A9o's side it is 65.57%. ## Keep exploring The calculator link fills in As9h against Td9d, 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 As9h against Td9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As9h&p2=Td9d) - [A9o combos](https://georgelipoker.com/combos/a9o.md) - [T9s combos](https://georgelipoker.com/combos/t9s.md) - [A9o vs 33](https://georgelipoker.com/equity/a9o-vs-33.md) - [A9o vs T8s](https://georgelipoker.com/equity/a9o-vs-t8s.md) - [KJo vs T9s](https://georgelipoker.com/equity/kjo-vs-t9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 36 specific A9o against T9s deals meets all 1,712,304 boards, and the better five-card hand wins; a split pot is half a win each. The flop table reads each board under all ten of its three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [A9o vs 33: preflop equity](https://georgelipoker.com/equity/a9o-vs-33.md) - [A9o vs T8s: preflop equity](https://georgelipoker.com/equity/a9o-vs-t8s.md) - [KJo vs T9s: preflop equity](https://georgelipoker.com/equity/kjo-vs-t9s.md)