--- title: "ATo vs T9s: preflop equity" url: "https://georgelipoker.com/equity/ato-vs-t9s.md" canonical_url: "https://georgelipoker.com/equity/ato-vs-t9s" last_updated: "2026-10-23" type: "reference" summary: "ATo is a big favorite over T9s before the flop: 67.90% to 32.10% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ato-vs-33.md", "https://georgelipoker.com/equity/ato-vs-t8s.md", "https://georgelipoker.com/equity/kjs-vs-t9s.md"] --- # ATo vs T9s: preflop equity ATo is a big favorite over T9s before the flop: 67.90% to 32.10% equity, counted exactly over every board, with the split by flop type and suit. The exact count puts ATo at 67.90% and T9s at 32.10% when the two hands see all five board cards. ## ATo against T9s: the numbers **Exact preflop results for ATo against T9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | ATo | 66.828 | 2.152 | 31.020 | 67.904 | | T9s | 31.020 | 2.152 | 66.828 | 32.096 | One side is an offsuit hand, the other is a suited hand. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing. That is a clear edge, 67.90% to 32.10%, but T9s still wins often enough that one hand proves nothing. Ties are part of the picture: 2.15% of boards end in a split pot, and each side counts that as half a win. In the ranking of all 169 starting hands, ATo is number 19 and T9s is number 64. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | ATo | 41,195,000 | 1,327,000 | 19,122,000 | | T9s | 19,122,000 | 1,327,000 | 41,195,000 | Exact total: 36 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. **ATo 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) | | --- | --- | --- | --- | --- | | ATo | 2.116 | 1.496 | 3.224 | 0.473 | | T9s | 0.473 | 3.224 | 1.496 | 2.116 | The last column is the smallest pot odds, written as a pot-to-call ratio, at which a call breaks even with this equity. ## Who is ahead on which flops Across the five flop textures ATo's equity moves by 17.83 points, from 55.46% on low rainbow flops (nine high or lower) to 73.29% on rainbow flops topped by a ten or better. 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 T9s by flop texture, in percent** | Flop | Share of flops | ATo wins | Ties | T9s wins | ATo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 23.905 | 72.349 | 1.884 | 25.767 | 73.291 | | Rainbow, nine or lower | 7.042 | 54.021 | 2.868 | 43.111 | 55.455 | | Two-tone | 46.527 | 64.913 | 1.960 | 33.127 | 65.893 | | Monotone | 5.192 | 61.923 | 3.389 | 34.688 | 63.617 | | Paired | 17.334 | 71.027 | 2.374 | 26.599 | 72.214 | 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 Start from the random-hand figures, 62.72% for ATo and 54.03% for T9s. This opponent changes them by +5.18 and -21.93 points. **ATo 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 | | --- | --- | --- | --- | --- | | ATo, all flops | 67.904 | 62.722 | +5.182 | 1.08262 | | ATo, rainbow, ten or higher | 73.291 | 62.722 | +10.569 | 1.16851 | | ATo, rainbow, nine or lower | 55.455 | 62.722 | -7.267 | 0.88414 | | ATo, two-tone | 65.893 | 62.722 | +3.171 | 1.05056 | | ATo, monotone | 63.617 | 62.722 | +0.895 | 1.01427 | | ATo, paired | 72.214 | 62.722 | +9.492 | 1.15133 | | T9s, all flops | 32.096 | 54.028 | -21.932 | 0.59406 | | T9s, rainbow, ten or higher | 26.709 | 54.028 | -27.319 | 0.49435 | | T9s, rainbow, nine or lower | 44.545 | 54.028 | -9.483 | 0.82448 | | T9s, two-tone | 34.107 | 54.028 | -19.921 | 0.63128 | | T9s, monotone | 36.383 | 54.028 | -17.645 | 0.67341 | | T9s, paired | 27.786 | 54.028 | -26.242 | 0.51429 | ## Does a shared suit matter? When the hands share a suit, ATo holds 68.95%; when they do not, it holds 67.38%. ATo does better with a shared suit, by 1.57 points. **ATo against T9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | ATo wins | Ties | T9s wins | ATo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 33.33 | 67.832 | 2.241 | 29.927 | 68.952 | | No shared suit | 24 | 66.67 | 66.326 | 2.107 | 31.567 | 67.380 | ## How often this matchup comes up Exactly 36 specific deals fit this matchup in one seat order, which is 0.0022% of 1,624,350; both orders together give 72, or 0.0044%. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, ATo's average share is $135.80 (a gain of $35.80) and T9s' is $64.20 (a loss of $35.80). Run 1,000 deals and the tally comes out near 668 for ATo, 310 for T9s and 22 ties. ## The same matchup from the other side If you came looking for T9s against ATo, the numbers are the same with the hands swapped: 32.10% and 67.90%. ## Keep exploring The calculator link fills in AsTh 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 AsTh against Td9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsTh&p2=Td9d) - [ATo combos](https://georgelipoker.com/combos/ato.md) - [T9s combos](https://georgelipoker.com/combos/t9s.md) - [ATo vs 33](https://georgelipoker.com/equity/ato-vs-33.md) - [ATo vs T8s](https://georgelipoker.com/equity/ato-vs-t8s.md) - [KJs vs T9s](https://georgelipoker.com/equity/kjs-vs-t9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 36 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [ATo vs 33: preflop equity](https://georgelipoker.com/equity/ato-vs-33.md) - [ATo vs T8s: preflop equity](https://georgelipoker.com/equity/ato-vs-t8s.md) - [KJs vs T9s: preflop equity](https://georgelipoker.com/equity/kjs-vs-t9s.md)