--- title: "66 vs A6s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-a6s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-a6s" last_updated: "2026-10-23" type: "reference" summary: "66 is a big favorite over A6s before the flop: 65.50% to 34.50% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-kto.md", "https://georgelipoker.com/equity/66-vs-qts.md", "https://georgelipoker.com/equity/a9s-vs-a6s.md"] --- # 66 vs A6s: preflop equity 66 is a big favorite over A6s before the flop: 65.50% to 34.50% equity, counted exactly over every board, with the split by flop type and suit. Dealt all in against each other, 66 takes 65.50% of the pot on average and A6s takes the other 34.50%. ## 66 against A6s: the numbers **Exact preflop results for 66 against A6s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 64.188 | 2.619 | 33.193 | 65.498 | | A6s | 33.193 | 2.619 | 64.188 | 34.502 | 66 and A6s are a pocket pair and a suited hand, in that order. The non-pair hand shares a rank with the pair, so two of its outs for pairing are blocked by the pair itself. That is a clear edge, 65.50% to 34.50%, but A6s still wins often enough that one hand proves nothing. A split pot comes up on 2.62% of boards, so the wins and the equity differ by half of that. Among the 169 starting hands, 66 is number 17 and A6s is number 31 by strength against a random hand. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 13,189,000 | 538,000 | 6,820,000 | | A6s | 6,820,000 | 538,000 | 13,189,000 | The board total is exact, 12 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 A6s 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 | 1.898 | 1.558 | 3.013 | 0.527 | | A6s | 0.527 | 3.013 | 1.558 | 1.898 | 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 19.72 points, from 61.49% on monotone flops to 81.21% on low rainbow flops (nine high or lower). 66 stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **66 against A6s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | A6s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.197 | 63.517 | 1.660 | 34.823 | 64.347 | | Rainbow, nine or lower | 5.585 | 76.623 | 9.172 | 14.205 | 81.209 | | Two-tone | 46.236 | 62.545 | 2.706 | 34.749 | 63.898 | | Monotone | 5.151 | 59.840 | 3.302 | 36.858 | 61.491 | | Paired | 17.831 | 66.758 | 1.496 | 31.746 | 67.506 | 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 +2.21 points (baseline 63.29%) and A6s by -25.41 points (baseline 59.91%). **66 and A6s 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 | 65.498 | 63.285 | +2.213 | 1.03497 | | 66, rainbow, ten or higher | 64.347 | 63.285 | +1.062 | 1.01678 | | 66, rainbow, nine or lower | 81.209 | 63.285 | +17.924 | 1.28323 | | 66, two-tone | 63.898 | 63.285 | +0.613 | 1.00969 | | 66, monotone | 61.491 | 63.285 | -1.794 | 0.97165 | | 66, paired | 67.506 | 63.285 | +4.221 | 1.06670 | | A6s, all flops | 34.502 | 59.906 | -25.404 | 0.57594 | | A6s, rainbow, ten or higher | 35.653 | 59.906 | -24.253 | 0.59515 | | A6s, rainbow, nine or lower | 18.791 | 59.906 | -41.115 | 0.31367 | | A6s, two-tone | 36.102 | 59.906 | -23.804 | 0.60264 | | A6s, monotone | 38.509 | 59.906 | -21.397 | 0.64282 | | A6s, paired | 32.494 | 59.906 | -27.412 | 0.54242 | ## Does a shared suit matter? Every legal deal of 66 against A6s leaves the hands with no suit in common, so the suit split does not apply here. **66 against A6s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | A6s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 64.188 | 2.619 | 33.193 | 65.498 | ## How often this matchup comes up Counting specific cards, 66 against A6s appears in 12 of the 1,624,350 ordered heads-up deals (0.0007%), and in 24 when the seats are swapped too (0.0015%). ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. 66 is worth $131.00 on average (+$31.00); A6s is worth $69.00 (-$31.00). A thousand deals look like this: 66 takes 642, A6s takes 332, 26 are ties. ## The same matchup from the other side Swap the hands and you get A6s with 34.50% against 66 with 65.50%. We keep one page per matchup, with the better-ranked hand first. ## Keep exploring Try 6s6h against Ad6d 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 Ad6d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Ad6d) - [66 combos](https://georgelipoker.com/combos/66.md) - [A6s combos](https://georgelipoker.com/combos/a6s.md) - [66 vs KTo](https://georgelipoker.com/equity/66-vs-kto.md) - [66 vs QTs](https://georgelipoker.com/equity/66-vs-qts.md) - [A9s vs A6s](https://georgelipoker.com/equity/a9s-vs-a6s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 12 specific 66 against A6s deals meets all 1,712,304 boards, and the better five-card hand wins; a split pot is half a win each. The flop table reads each board under all ten of its three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [66 vs KTo: preflop equity](https://georgelipoker.com/equity/66-vs-kto.md) - [66 vs QTs: preflop equity](https://georgelipoker.com/equity/66-vs-qts.md) - [A9s vs A6s: preflop equity](https://georgelipoker.com/equity/a9s-vs-a6s.md)