--- title: "66 vs A8s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-a8s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-a8s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, 66 or A8s? 66 leads 53.32% to 46.69% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-kts.md", "https://georgelipoker.com/equity/66-vs-kqo.md", "https://georgelipoker.com/equity/a9s-vs-a8s.md"] --- # 66 vs A8s: preflop equity Who is ahead, 66 or A8s? 66 leads 53.32% to 46.69% before the flop, counted exactly over every board, with the split by flop type and suit. Counting every board, the equity split is 53.32% for 66 and 46.68% for A8s, so 66 leads by 6.64 points. ## 66 against A8s: the numbers **Exact preflop results for 66 against A8s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 53.109 | 0.412 | 46.479 | 53.315 | | A8s | 46.479 | 0.412 | 53.109 | 46.685 | The matchup pits a pocket pair against a suited hand. A pair against two higher cards is the classic race: the pair is usually a small favorite or close to even, and each overcard that pairs is a way to take the lead. This is close to even money, with 66 a little ahead. 0.41% of boards are ties, so the equity of each hand is its win rate plus half of that. For context, 66 sits at number 17 of 169 starting hands and A8s at number 21 when each is run against a random hand. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 21,825,000 | 169,000 | 19,101,000 | | A8s | 19,101,000 | 169,000 | 21,825,000 | The board total is exact, 24 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **66 against A8s 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 | 1.142 | 1.883 | 2.152 | 0.876 | | A8s | 0.876 | 2.152 | 1.883 | 1.142 | 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 66's equity moves by 11.08 points, from 51.73% on two-tone flops to 62.81% on low rainbow flops (nine high or lower). 66 stays ahead on all five textures. **66 against A8s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | A8s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 52.057 | 0.208 | 47.735 | 52.161 | | Rainbow, nine or lower | 5.689 | 62.533 | 0.562 | 36.905 | 62.814 | | Two-tone | 46.545 | 51.603 | 0.255 | 48.142 | 51.731 | | Monotone | 5.212 | 51.098 | 2.447 | 46.455 | 52.322 | | Paired | 17.334 | 56.196 | 0.467 | 43.337 | 56.430 | Rainbow flops have three suits, two-tone flops repeat one suit, monotone flops are all one suit, and paired flops repeat a rank. ## Compared with a random hand Each hand has a baseline against a random hand: 63.29% for 66, 61.94% for A8s. Here the change is -9.97 and -15.26 points. **66 and A8s 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 | 53.315 | 63.285 | -9.970 | 0.84246 | | 66, rainbow, ten or higher | 52.161 | 63.285 | -11.124 | 0.82422 | | 66, rainbow, nine or lower | 62.814 | 63.285 | -0.471 | 0.99256 | | 66, two-tone | 51.731 | 63.285 | -11.554 | 0.81743 | | 66, monotone | 52.322 | 63.285 | -10.963 | 0.82677 | | 66, paired | 56.430 | 63.285 | -6.855 | 0.89168 | | A8s, all flops | 46.685 | 61.944 | -15.259 | 0.75366 | | A8s, rainbow, ten or higher | 47.839 | 61.944 | -14.105 | 0.77229 | | A8s, rainbow, nine or lower | 37.186 | 61.944 | -24.758 | 0.60032 | | A8s, two-tone | 48.269 | 61.944 | -13.675 | 0.77924 | | A8s, monotone | 47.678 | 61.944 | -14.266 | 0.76970 | | A8s, paired | 43.570 | 61.944 | -18.374 | 0.70338 | ## Does a shared suit matter? When the hands share a suit, 66 holds 53.50%; when they do not, it holds 53.14%. 66 does better with a shared suit, by 0.36 points. **66 against A8s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | A8s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 53.269 | 0.453 | 46.278 | 53.495 | | No shared suit | 12 | 50.00 | 52.950 | 0.370 | 46.680 | 53.135 | ## 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 Worked example: both players commit $100, so $200 sits in the middle. Over every board, 66's average share is $106.64 (a gain of $6.64) and A8s' is $93.36 (a loss of $6.64). Out of 1,000 deals you should see around 531 outright wins for 66, 465 for A8s, and 4 split pots. ## The same matchup from the other side If you came looking for A8s against 66, the numbers are the same with the hands swapped: 46.68% and 53.32%. ## Keep exploring The calculator link fills in 6s6h against Ad8d, 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 6s6h against Ad8d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Ad8d) - [66 combos](https://georgelipoker.com/combos/66.md) - [A8s combos](https://georgelipoker.com/combos/a8s.md) - [66 vs KTs](https://georgelipoker.com/equity/66-vs-kts.md) - [66 vs KQo](https://georgelipoker.com/equity/66-vs-kqo.md) - [A9s vs A8s](https://georgelipoker.com/equity/a9s-vs-a8s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 24 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 - [66 vs KTs: preflop equity](https://georgelipoker.com/equity/66-vs-kts.md) - [66 vs KQo: preflop equity](https://georgelipoker.com/equity/66-vs-kqo.md) - [A9s vs A8s: preflop equity](https://georgelipoker.com/equity/a9s-vs-a8s.md)