--- title: "AJo vs A9o: preflop equity" url: "https://georgelipoker.com/equity/ajo-vs-a9o.md" canonical_url: "https://georgelipoker.com/equity/ajo-vs-a9o" last_updated: "2026-10-23" type: "reference" summary: "AJo is a big favorite over A9o before the flop: 73.04% to 26.96% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/ajo-vs-kjo.md", "https://georgelipoker.com/equity/ajo-vs-55.md", "https://georgelipoker.com/equity/kqs-vs-a9o.md"] --- # AJo vs A9o: preflop equity AJo is a big favorite over A9o before the flop: 73.04% to 26.96% 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, AJo finishes with 73.04% of the pot and A9o with 26.96%. ## AJo against A9o: the numbers **Exact preflop results for AJo against A9o, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | AJo | 69.128 | 7.823 | 23.049 | 73.040 | | A9o | 23.049 | 7.823 | 69.128 | 26.960 | Both hands are offsuit hands: AJo and A9o. The two hands share a rank, and the one with the better other card dominates: it wins most kicker battles when that shared rank hits. AJo is the clear favorite, though A9o gets there on roughly one board in 4. The tie share is 7.82%: on those boards the pot is chopped and neither hand wins outright. AJo ranks number 15 of 169 starting hands, and A9o ranks number 25, by equity against a random hand. **Boards behind the percentages: 184,928,832 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | AJo | 127,838,000 | 14,467,000 | 42,624,000 | | A9o | 42,624,000 | 14,467,000 | 127,838,000 | The board total is exact, 108 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **AJo against A9o read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | AJo | 2.709 | 1.447 | 4.339 | 0.369 | | A9o | 0.369 | 4.339 | 1.447 | 2.709 | 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 By flop texture, AJo's equity runs from 60.89% on low rainbow flops (nine high or lower) up to 78.21% on rainbow flops topped by a ten or better. AJo stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **AJo against A9o by flop texture, in percent** | Flop | Share of flops | AJo wins | Ties | A9o wins | AJo equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.003 | 75.384 | 5.654 | 18.962 | 78.211 | | Rainbow, nine or lower | 7.042 | 58.631 | 4.526 | 36.843 | 60.894 | | Two-tone | 46.477 | 70.925 | 5.311 | 23.764 | 73.580 | | Monotone | 5.144 | 65.291 | 5.890 | 28.819 | 68.236 | | Paired | 17.334 | 61.052 | 19.475 | 19.473 | 70.789 | A rainbow flop shows three suits, a two-tone flop repeats one suit, a monotone flop is a single suit, and a paired flop repeats a rank. ## Compared with a random hand Each hand has a baseline against a random hand: 63.56% for AJo, 60.77% for A9o. Here the change is +9.48 and -33.81 points. **AJo and A9o 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 | | --- | --- | --- | --- | --- | | AJo, all flops | 73.040 | 63.563 | +9.477 | 1.14910 | | AJo, rainbow, ten or higher | 78.211 | 63.563 | +14.648 | 1.23045 | | AJo, rainbow, nine or lower | 60.894 | 63.563 | -2.669 | 0.95801 | | AJo, two-tone | 73.580 | 63.563 | +10.017 | 1.15759 | | AJo, monotone | 68.236 | 63.563 | +4.673 | 1.07352 | | AJo, paired | 70.789 | 63.563 | +7.226 | 1.11368 | | A9o, all flops | 26.960 | 60.773 | -33.813 | 0.44362 | | A9o, rainbow, ten or higher | 21.789 | 60.773 | -38.984 | 0.35853 | | A9o, rainbow, nine or lower | 39.106 | 60.773 | -21.667 | 0.64348 | | A9o, two-tone | 26.420 | 60.773 | -34.353 | 0.43473 | | A9o, monotone | 31.764 | 60.773 | -29.009 | 0.52267 | | A9o, paired | 29.211 | 60.773 | -31.562 | 0.48066 | ## Does a shared suit matter? The suit split reads 73.14% for AJo with a shared suit and 72.67% without one. AJo does better with a shared suit, by 0.47 points. **AJo against A9o by suit overlap, in percent** | Deals | Specific deals | Share of deals | AJo wins | Ties | A9o wins | AJo equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 84 | 77.78 | 69.217 | 7.855 | 22.928 | 73.144 | | No shared suit | 24 | 22.22 | 68.819 | 7.710 | 23.471 | 72.674 | ## How often this matchup comes up Exactly 108 specific deals fit this matchup in one seat order, which is 0.0066% of 1,624,350; both orders together give 216, or 0.0133%. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says AJo gets $146.08 of it on average and A9o gets $53.92. Run 1,000 deals and the tally comes out near 691 for AJo, 231 for A9o and 78 ties. ## The same matchup from the other side The reversed view, A9o against AJo, shows 26.96% for A9o and 73.04% for AJo. It is the same count, so it redirects here. ## Keep exploring Try AsJh against Ad9c 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 AsJh against Ad9c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=AsJh&p2=Ad9c) - [AJo combos](https://georgelipoker.com/combos/ajo.md) - [A9o combos](https://georgelipoker.com/combos/a9o.md) - [AJo vs KJo](https://georgelipoker.com/equity/ajo-vs-kjo.md) - [AJo vs 55](https://georgelipoker.com/equity/ajo-vs-55.md) - [KQs vs A9o](https://georgelipoker.com/equity/kqs-vs-a9o.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 108 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [AJo vs KJo: preflop equity](https://georgelipoker.com/equity/ajo-vs-kjo.md) - [AJo vs 55: preflop equity](https://georgelipoker.com/equity/ajo-vs-55.md) - [KQs vs A9o: preflop equity](https://georgelipoker.com/equity/kqs-vs-a9o.md)