--- title: "ATo vs T9o: preflop equity" url: "https://georgelipoker.com/equity/ato-vs-t9o.md" canonical_url: "https://georgelipoker.com/equity/ato-vs-t9o" last_updated: "2026-10-23" type: "reference" summary: "ATo is a big favorite over T9o before the flop: 72.08% to 27.92% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ato-vs-98s.md", "https://georgelipoker.com/equity/ato-vs-22.md", "https://georgelipoker.com/equity/kjs-vs-t9o.md"] --- # ATo vs T9o: preflop equity ATo is a big favorite over T9o before the flop: 72.08% to 27.92% 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, ATo finishes with 72.08% of the pot and T9o with 27.92%. ## ATo against T9o: the numbers **Exact preflop results for ATo against T9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATo | 70.980 | 2.201 | 26.819 | 72.081 | | T9o | 26.819 | 2.201 | 70.980 | 27.919 | This is a contest between two offsuit hands, ATo and T9o. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up. ATo is the clear favorite, though T9o gets there on roughly one board in 4. Ties are part of the picture: 2.20% of boards end in a split pot, and each side counts that as half a win. For context, ATo sits at number 19 of 169 starting hands and T9o at number 78 when each is run against a random hand. **Boards behind the percentages: 184,928,832 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATo | 131,262,000 | 4,070,000 | 49,596,000 | | T9o | 49,596,000 | 4,070,000 | 131,262,000 | 108 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. **ATo 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) | | --- | --- | --- | --- | --- | | ATo | 2.582 | 1.409 | 3.729 | 0.387 | | T9o | 0.387 | 3.729 | 1.409 | 2.582 | 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 The flop changes the picture. ATo does best on paired flops, at 76.45%, and worst on low rainbow flops (nine high or lower), at 57.47%. ATo stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **ATo against T9o by flop texture, in percent** | Flop | Share of flops | ATo wins | Ties | T9o wins | ATo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.003 | 74.660 | 1.934 | 23.406 | 75.627 | | Rainbow, nine or lower | 7.042 | 55.987 | 2.960 | 41.053 | 57.467 | | Two-tone | 46.477 | 70.173 | 2.084 | 27.743 | 71.215 | | Monotone | 5.144 | 67.230 | 2.843 | 29.927 | 68.651 | | Paired | 17.334 | 75.253 | 2.389 | 22.358 | 76.448 | Read the flop types this way: rainbow has three suits, two-tone has two cards of one suit, monotone has three, and paired repeats a rank. ## Compared with a random hand A random hand would give ATo 62.72% and T9o 51.53%. Against each other the change is +9.36 points for ATo and -23.61 for T9o. **ATo 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 | | --- | --- | --- | --- | --- | | ATo, all flops | 72.081 | 62.722 | +9.359 | 1.14921 | | ATo, rainbow, ten or higher | 75.627 | 62.722 | +12.905 | 1.20575 | | ATo, rainbow, nine or lower | 57.467 | 62.722 | -5.255 | 0.91622 | | ATo, two-tone | 71.215 | 62.722 | +8.493 | 1.13541 | | ATo, monotone | 68.651 | 62.722 | +5.929 | 1.09453 | | ATo, paired | 76.448 | 62.722 | +13.726 | 1.21884 | | T9o, all flops | 27.919 | 51.532 | -23.613 | 0.54178 | | T9o, rainbow, ten or higher | 24.373 | 51.532 | -27.159 | 0.47297 | | T9o, rainbow, nine or lower | 42.533 | 51.532 | -8.999 | 0.82537 | | T9o, two-tone | 28.785 | 51.532 | -22.747 | 0.55858 | | T9o, monotone | 31.349 | 51.532 | -20.183 | 0.60834 | | T9o, paired | 23.552 | 51.532 | -27.980 | 0.45704 | ## Does a shared suit matter? The suit split reads 72.24% for ATo with a shared suit and 71.51% without one. ATo does better with a shared suit, by 0.73 points. **ATo against T9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATo wins | Ties | T9o wins | ATo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 84 | 77.78 | 71.129 | 2.228 | 26.643 | 72.243 | | No shared suit | 24 | 22.22 | 70.458 | 2.108 | 27.434 | 71.512 | ## How often this matchup comes up The class pair covers 108 combinations of specific cards in a fixed seat order, 0.0066% of 1,624,350, and 216 (0.0133%) in either order. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, ATo's average share is $144.16 (a gain of $44.16) and T9o's is $55.84 (a loss of $44.16). Think in thousands: about 710 of 1,000 go to ATo, about 268 go to T9o, and about 22 are chopped. ## The same matchup from the other side Read it from the other side: T9o against ATo is the same matchup with the numbers swapped, so T9o holds 27.92% and ATo holds 72.08%. That address sends you back to this page. ## Keep exploring Try AsTh against Td9c 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 AsTh against Td9c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTh&p2=Td9c) - [ATo combos](https://georgelipoker.com/combos/ato.md) - [T9o combos](https://georgelipoker.com/combos/t9o.md) - [ATo vs 98s](https://georgelipoker.com/equity/ato-vs-98s.md) - [ATo vs 22](https://georgelipoker.com/equity/ato-vs-22.md) - [KJs vs T9o](https://georgelipoker.com/equity/kjs-vs-t9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Each figure is a complete count over boards. Take the 108 specific deals, group them by suit pattern, deal all 1,712,304 boards against each, and compare the two seven-card hands. Equity counts a tie as half a win; the flop rows use every one of a board's ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATo vs 98s: preflop equity](https://georgelipoker.com/equity/ato-vs-98s.md) - [ATo vs 22: preflop equity](https://georgelipoker.com/equity/ato-vs-22.md) - [KJs vs T9o: preflop equity](https://georgelipoker.com/equity/kjs-vs-t9o.md)