--- title: "66 vs A3s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-a3s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-a3s" last_updated: "2026-10-23" type: "reference" summary: "66 is a big favorite over A3s before the flop: 66.03% to 33.97% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-qjo.md", "https://georgelipoker.com/equity/66-vs-k9o.md", "https://georgelipoker.com/equity/a9s-vs-a3s.md"] --- # 66 vs A3s: preflop equity 66 is a big favorite over A3s before the flop: 66.03% to 33.97% equity, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, 66 holds 66.03% equity against A3s, which leaves A3s with 33.97%. ## 66 against A3s: the numbers **Exact preflop results for 66 against A3s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 65.794 | 0.475 | 33.731 | 66.031 | | A3s | 33.731 | 0.475 | 65.794 | 33.969 | One side is a pocket pair, the other is a suited hand. The pair sits between the other hand's two cards: one is higher and one is lower, so the pair is exposed to the higher card. A lead of 32.06 points is large but not decisive: A3s still takes about 337 of every 1,000 deals. Of every 100 boards, about 0.48 are split pots, and the equity figures already include them. By strength against a random hand, 66 holds place 17 of 169 and A3s holds place 38. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 27,038,000 | 195,000 | 13,862,000 | | A3s | 13,862,000 | 195,000 | 27,038,000 | 24 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand. **66 against A3s 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 | 1.944 | 1.520 | 2.965 | 0.514 | | A3s | 0.514 | 2.965 | 1.520 | 1.944 | The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call. ## Who is ahead on which flops The flop changes the picture. 66 does best on low rainbow flops (nine high or lower), at 79.44%, and worst on monotone flops, at 62.54%. 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 A3s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | A3s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 65.600 | 0.251 | 34.149 | 65.726 | | Rainbow, nine or lower | 5.689 | 79.054 | 0.777 | 20.169 | 79.442 | | Two-tone | 46.545 | 64.892 | 0.317 | 34.791 | 65.050 | | Monotone | 5.212 | 61.292 | 2.486 | 36.222 | 62.535 | | Paired | 17.334 | 65.502 | 0.519 | 33.979 | 65.762 | 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 Against one random hand instead, 66 holds 63.29% and A3s holds 58.22%. Facing each other changes that by +2.74 points for 66 and -24.25 points for A3s. **66 and A3s 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 | 66.031 | 63.285 | +2.746 | 1.04339 | | 66, rainbow, ten or higher | 65.726 | 63.285 | +2.441 | 1.03857 | | 66, rainbow, nine or lower | 79.442 | 63.285 | +16.157 | 1.25531 | | 66, two-tone | 65.050 | 63.285 | +1.765 | 1.02789 | | 66, monotone | 62.535 | 63.285 | -0.750 | 0.98815 | | 66, paired | 65.762 | 63.285 | +2.477 | 1.03914 | | A3s, all flops | 33.969 | 58.220 | -24.251 | 0.58346 | | A3s, rainbow, ten or higher | 34.274 | 58.220 | -23.946 | 0.58870 | | A3s, rainbow, nine or lower | 20.558 | 58.220 | -37.662 | 0.35311 | | A3s, two-tone | 34.950 | 58.220 | -23.270 | 0.60031 | | A3s, monotone | 37.465 | 58.220 | -20.755 | 0.64351 | | A3s, paired | 34.238 | 58.220 | -23.982 | 0.58808 | ## Does a shared suit matter? Two kinds of deal exist here. In 12 of them the hands share a suit and 66 holds 66.33%. In 12 they do not, and it holds 65.74%. 66 does better with a shared suit, by 0.59 points. **66 against A3s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | A3s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 66.067 | 0.518 | 33.415 | 66.326 | | No shared suit | 12 | 50.00 | 65.521 | 0.431 | 34.048 | 65.737 | ## How often this matchup comes up How often does it happen? 24 of the 1,624,350 ordered deals (0.0015%) are 66 against A3s, and 48 (0.0030%) if either hand may sit in either seat. ## A worked example To see what the equity is worth, imagine $100 each in a $200 pot. 66 is worth $132.06 on average (+$32.06); A3s is worth $67.94 (-$32.06). Out of 1,000 deals you should see around 658 outright wins for 66, 337 for A3s, and 5 split pots. ## The same matchup from the other side One page covers both views. From A3s' side the equity is 33.97%, and from 66's side it is 66.03%. ## Keep exploring Try 6s6h against Ad3d 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 Ad3d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Ad3d) - [66 combos](https://georgelipoker.com/combos/66.md) - [A3s combos](https://georgelipoker.com/combos/a3s.md) - [66 vs QJo](https://georgelipoker.com/equity/66-vs-qjo.md) - [66 vs K9o](https://georgelipoker.com/equity/66-vs-k9o.md) - [A9s vs A3s](https://georgelipoker.com/equity/a9s-vs-a3s.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 A3s 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 QJo: preflop equity](https://georgelipoker.com/equity/66-vs-qjo.md) - [66 vs K9o: preflop equity](https://georgelipoker.com/equity/66-vs-k9o.md) - [A9s vs A3s: preflop equity](https://georgelipoker.com/equity/a9s-vs-a3s.md)