--- title: "JJ vs 66: preflop equity" url: "https://georgelipoker.com/equity/jj-vs-66.md" canonical_url: "https://georgelipoker.com/equity/jj-vs-66" last_updated: "2026-10-23" type: "reference" summary: "JJ is a big favorite over 66 before the flop: 80.97% to 19.03% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/jj-vs-a9s.md", "https://georgelipoker.com/equity/jj-vs-ato.md", "https://georgelipoker.com/equity/tt-vs-66.md"] --- # JJ vs 66: preflop equity JJ is a big favorite over 66 before the flop: 80.97% to 19.03% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, JJ is ahead of 66 by 61.94 points of equity, 80.97% to 19.03%. ## JJ against 66: the numbers **Exact preflop results for JJ against 66, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | JJ | 80.775 | 0.384 | 18.841 | 80.967 | | 66 | 18.841 | 0.384 | 80.775 | 19.033 | Both hands are pocket pairs: JJ and 66. Two pairs against each other is a one-way street: the lower pair needs one of its two remaining cards. This is one of the lopsided matchups: 66 wins only 18.84% of the boards outright. Ties are 0.38% of the outcomes here; each tied board gives both hands half the pot. For context, JJ sits at number 4 of 169 starting hands and 66 at number 17 when each is run against a random hand. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | JJ | 49,792,000 | 237,000 | 11,614,000 | | 66 | 11,614,000 | 237,000 | 49,792,000 | Exact total: 36 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **JJ against 66 read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | JJ | 4.254 | 1.238 | 5.308 | 0.235 | | 66 | 0.235 | 5.308 | 1.238 | 4.254 | In the last column, a pot-to-call ratio at or above the figure makes a call break even or better at this equity. ## Who is ahead on which flops Break the boards down by their first three cards and JJ is strongest on paired flops (86.46%) and weakest on low rainbow flops (nine high or lower) (65.85%). JJ stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **JJ against 66 by flop texture, in percent** | Flop | Share of flops | JJ wins | Ties | 66 wins | JJ equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 84.081 | 0.193 | 15.726 | 84.178 | | Rainbow, nine or lower | 6.314 | 65.482 | 0.728 | 33.790 | 65.846 | | Two-tone | 46.363 | 79.717 | 0.292 | 19.991 | 79.863 | | Monotone | 5.152 | 74.489 | 1.747 | 23.764 | 75.362 | | Paired | 17.576 | 86.274 | 0.372 | 13.354 | 86.460 | 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 How much does the opponent matter? Compared with its random-hand 77.47%, JJ changes by +3.50 points, and 66, from 63.29%, by -44.26. **JJ and 66 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 | | --- | --- | --- | --- | --- | | JJ, all flops | 80.967 | 77.469 | +3.498 | 1.04515 | | JJ, rainbow, ten or higher | 84.178 | 77.469 | +6.709 | 1.08660 | | JJ, rainbow, nine or lower | 65.846 | 77.469 | -11.623 | 0.84997 | | JJ, two-tone | 79.863 | 77.469 | +2.394 | 1.03090 | | JJ, monotone | 75.362 | 77.469 | -2.107 | 0.97280 | | JJ, paired | 86.460 | 77.469 | +8.991 | 1.11606 | | 66, all flops | 19.033 | 63.285 | -44.252 | 0.30075 | | 66, rainbow, ten or higher | 15.822 | 63.285 | -47.463 | 0.25001 | | 66, rainbow, nine or lower | 34.154 | 63.285 | -29.131 | 0.53969 | | 66, two-tone | 20.137 | 63.285 | -43.148 | 0.31820 | | 66, monotone | 24.638 | 63.285 | -38.647 | 0.38932 | | 66, paired | 13.540 | 63.285 | -49.745 | 0.21395 | ## Does a shared suit matter? Of the deals of this matchup, 30 share a suit (JJ at 81.10%) and 6 do not (80.30%). JJ does better with a shared suit, by 0.80 points. **JJ against 66 by suit overlap, in percent** | Deals | Specific deals | Share of deals | JJ wins | Ties | 66 wins | JJ equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 30 | 83.33 | 80.900 | 0.400 | 18.700 | 81.100 | | No shared suit | 6 | 16.67 | 80.146 | 0.307 | 19.547 | 80.300 | ## How often this matchup comes up You will meet this exact matchup 0.0044% of the time in a random heads-up deal: 72 of 1,624,350, counting either seat order. ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says JJ gets $161.94 of it on average and 66 gets $38.06. Scaled to 1,000 deals, that is roughly 808 wins for JJ, 188 for 66 and 4 chopped pots. ## The same matchup from the other side Read it from the other side: 66 against JJ is the same matchup with the numbers swapped, so 66 holds 19.03% and JJ holds 80.97%. That address sends you back to this page. ## Keep exploring JsJh against 6d6c is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open JsJh against 6d6c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=JsJh&p2=6d6c) - [JJ combos](https://georgelipoker.com/combos/jj.md) - [66 combos](https://georgelipoker.com/combos/66.md) - [JJ vs A9s](https://georgelipoker.com/equity/jj-vs-a9s.md) - [JJ vs ATo](https://georgelipoker.com/equity/jj-vs-ato.md) - [TT vs 66](https://georgelipoker.com/equity/tt-vs-66.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Nothing here is simulated. The 36 deals of JJ against 66 fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [JJ vs A9s: preflop equity](https://georgelipoker.com/equity/jj-vs-a9s.md) - [JJ vs ATo: preflop equity](https://georgelipoker.com/equity/jj-vs-ato.md) - [TT vs 66: preflop equity](https://georgelipoker.com/equity/tt-vs-66.md)