--- title: "66 vs A9s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-a9s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-a9s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, 66 or A9s? 66 leads 53.24% to 46.76% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-ato.md", "https://georgelipoker.com/equity/66-vs-kjs.md", "https://georgelipoker.com/equity/kqs-vs-a9s.md"] --- # 66 vs A9s: preflop equity Who is ahead, 66 or A9s? 66 leads 53.24% to 46.76% before the flop, counted exactly over every board, with the split by flop type and suit. In equity, 66 against A9s stands at 53.24% to 46.76%, a gap of 6.48 points. ## 66 against A9s: the numbers **Exact preflop results for 66 against A9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 53.030 | 0.416 | 46.554 | 53.238 | | A9s | 46.554 | 0.416 | 53.030 | 46.762 | One side is a pocket pair, the other is a suited hand. One hand holds a pair and the other holds two cards that both outrank it, which keeps the equity closer than most people expect. This is close to even money, with 66 a little ahead. Ties are 0.42% of the outcomes here; each tied board gives both hands half the pot. In the ranking of all 169 starting hands, 66 is number 17 and A9s is number 18. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 21,793,000 | 171,000 | 19,132,000 | | A9s | 19,132,000 | 171,000 | 21,793,000 | The total is exact: 24 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **66 against A9s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | 66 | 1.138 | 1.886 | 2.148 | 0.878 | | A9s | 0.878 | 2.148 | 1.886 | 1.138 | 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 If you know the kind of flop that came, the numbers shift: 66 holds 62.53% on low rainbow flops (nine high or lower) and 51.66% on two-tone flops. 66 stays ahead on all five textures. **66 against A9s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | A9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 52.031 | 0.208 | 47.761 | 52.135 | | Rainbow, nine or lower | 5.689 | 62.228 | 0.605 | 37.167 | 62.530 | | Two-tone | 46.545 | 51.526 | 0.261 | 48.213 | 51.657 | | Monotone | 5.212 | 51.059 | 2.450 | 46.491 | 52.284 | | Paired | 17.334 | 56.095 | 0.463 | 43.442 | 56.327 | 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 Relative to a random opponent, 66 changes by -10.05 points (baseline 63.29%) and A9s by -16.02 points (baseline 62.78%). **66 and A9s 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 | | --- | --- | --- | --- | --- | | 66, all flops | 53.238 | 63.285 | -10.047 | 0.84124 | | 66, rainbow, ten or higher | 52.135 | 63.285 | -11.150 | 0.82381 | | 66, rainbow, nine or lower | 62.530 | 63.285 | -0.755 | 0.98807 | | 66, two-tone | 51.657 | 63.285 | -11.628 | 0.81626 | | 66, monotone | 52.284 | 63.285 | -11.001 | 0.82617 | | 66, paired | 56.327 | 63.285 | -6.958 | 0.89005 | | A9s, all flops | 46.762 | 62.781 | -16.019 | 0.74484 | | A9s, rainbow, ten or higher | 47.865 | 62.781 | -14.916 | 0.76241 | | A9s, rainbow, nine or lower | 37.470 | 62.781 | -25.311 | 0.59684 | | A9s, two-tone | 48.343 | 62.781 | -14.438 | 0.77003 | | A9s, monotone | 47.716 | 62.781 | -15.065 | 0.76004 | | A9s, paired | 43.673 | 62.781 | -19.108 | 0.69564 | ## Does a shared suit matter? The suit split reads 53.43% for 66 with a shared suit and 53.05% without one. 66 does better with a shared suit, by 0.38 points. **66 against A9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | A9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 53.198 | 0.458 | 46.344 | 53.427 | | No shared suit | 12 | 50.00 | 52.862 | 0.374 | 46.764 | 53.049 | ## How often this matchup comes up Exactly 24 specific deals fit this matchup in one seat order, which is 0.0015% of 1,624,350; both orders together give 48, or 0.0030%. ## A worked example Put $100 each into a $200 pot and deal every board once: 66 averages $106.48 back, ahead of its $100 by $6.48, while A9s averages $93.52, short of its $100 by $6.48. Out of 1,000 deals you should see around 530 outright wins for 66, 466 for A9s, and 4 split pots. ## The same matchup from the other side Read it from the other side: A9s against 66 is the same matchup with the numbers swapped, so A9s holds 46.76% and 66 holds 53.24%. That address sends you back to this page. ## Keep exploring Try 6s6h against Ad9d 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 6s6h against Ad9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Ad9d) - [66 combos](https://georgelipoker.com/combos/66.md) - [A9s combos](https://georgelipoker.com/combos/a9s.md) - [66 vs ATo](https://georgelipoker.com/equity/66-vs-ato.md) - [66 vs KJs](https://georgelipoker.com/equity/66-vs-kjs.md) - [KQs vs A9s](https://georgelipoker.com/equity/kqs-vs-a9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed This is an exact count with no sampling. For the 24 ways to deal one 66 and one A9s 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 - [66 vs ATo: preflop equity](https://georgelipoker.com/equity/66-vs-ato.md) - [66 vs KJs: preflop equity](https://georgelipoker.com/equity/66-vs-kjs.md) - [KQs vs A9s: preflop equity](https://georgelipoker.com/equity/kqs-vs-a9s.md)