--- title: "77 vs 66: preflop equity" url: "https://georgelipoker.com/equity/77-vs-66.md" canonical_url: "https://georgelipoker.com/equity/77-vs-66" last_updated: "2026-10-23" type: "reference" summary: "77 is a big favorite over 66 before the flop: 81.64% to 18.36% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/77-vs-a9s.md", "https://georgelipoker.com/equity/77-vs-ato.md", "https://georgelipoker.com/equity/aqs-vs-66.md"] --- # 77 vs 66: preflop equity 77 is a big favorite over 66 before the flop: 81.64% to 18.36% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, 77 is ahead of 66 by 63.28 points of equity, 81.64% to 18.36%. ## 77 against 66: the numbers **Exact preflop results for 77 against 66, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 77 | 80.973 | 1.338 | 17.689 | 81.642 | | 66 | 17.689 | 1.338 | 80.973 | 18.358 | Two pocket pairs meet here: 77 against 66. A pair against a smaller pair is the classic crush: the smaller pair needs one of its two remaining cards to make a set. This is one of the lopsided matchups: 66 wins only 17.69% of the boards outright. A split pot comes up on 1.34% of boards, so the wins and the equity differ by half of that. By strength against a random hand, 77 holds place 9 of 169 and 66 holds place 17. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 77 | 49,914,000 | 825,000 | 10,904,000 | | 66 | 10,904,000 | 825,000 | 49,914,000 | The board total is exact, 36 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages. **77 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) | | --- | --- | --- | --- | --- | | 77 | 4.447 | 1.235 | 5.653 | 0.225 | | 66 | 0.225 | 5.653 | 1.235 | 4.447 | 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 77 prefers paired flops, where it holds 85.26%, and likes low rainbow flops (nine high or lower) least, where it holds 74.05%. 77 stays ahead on all five textures. **77 against 66 by flop texture, in percent** | Flop | Share of flops | 77 wins | Ties | 66 wins | 77 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.844 | 82.619 | 0.825 | 16.556 | 83.032 | | Rainbow, nine or lower | 5.065 | 73.852 | 0.399 | 25.749 | 74.051 | | Two-tone | 46.363 | 80.569 | 0.742 | 18.689 | 80.940 | | Monotone | 5.152 | 74.994 | 2.222 | 22.784 | 76.105 | | Paired | 17.576 | 83.425 | 3.673 | 12.902 | 85.262 | 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: 66.24% for 77, 63.29% for 66. Here the change is +15.40 and -44.93 points. **77 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 | | --- | --- | --- | --- | --- | | 77, all flops | 81.642 | 66.236 | +15.406 | 1.23259 | | 77, rainbow, ten or higher | 83.032 | 66.236 | +16.796 | 1.25358 | | 77, rainbow, nine or lower | 74.051 | 66.236 | +7.815 | 1.11799 | | 77, two-tone | 80.940 | 66.236 | +14.704 | 1.22199 | | 77, monotone | 76.105 | 66.236 | +9.869 | 1.14900 | | 77, paired | 85.262 | 66.236 | +19.026 | 1.28725 | | 66, all flops | 18.358 | 63.285 | -44.927 | 0.29008 | | 66, rainbow, ten or higher | 16.968 | 63.285 | -46.317 | 0.26812 | | 66, rainbow, nine or lower | 25.949 | 63.285 | -37.336 | 0.41003 | | 66, two-tone | 19.060 | 63.285 | -44.225 | 0.30118 | | 66, monotone | 23.895 | 63.285 | -39.390 | 0.37758 | | 66, paired | 14.738 | 63.285 | -48.547 | 0.23288 | ## Does a shared suit matter? When the hands share a suit, 77 holds 81.78%; when they do not, it holds 80.95%. 77 does better with a shared suit, by 0.83 points. **77 against 66 by suit overlap, in percent** | Deals | Specific deals | Share of deals | 77 wins | Ties | 66 wins | 77 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 30 | 83.33 | 81.104 | 1.353 | 17.543 | 81.780 | | No shared suit | 6 | 16.67 | 80.321 | 1.262 | 18.417 | 80.952 | ## How often this matchup comes up The class pair covers 36 combinations of specific cards in a fixed seat order, 0.0022% of 1,624,350, and 72 (0.0044%) in either order. ## A worked example Worked example: both players commit $100, so $200 sits in the middle. Over every board, 77's average share is $163.28 (a gain of $63.28) and 66's is $36.72 (a loss of $63.28). Per 1,000 deals: 77 wins about 810, 66 wins about 177, and about 13 end in a split pot. ## The same matchup from the other side If you came looking for 66 against 77, the numbers are the same with the hands swapped: 18.36% and 81.64%. ## Keep exploring 7s7h 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 7s7h against 6d6c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=7s7h&p2=6d6c) - [77 combos](https://georgelipoker.com/combos/77.md) - [66 combos](https://georgelipoker.com/combos/66.md) - [77 vs A9s](https://georgelipoker.com/equity/77-vs-a9s.md) - [77 vs ATo](https://georgelipoker.com/equity/77-vs-ato.md) - [AQs vs 66](https://georgelipoker.com/equity/aqs-vs-66.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 36 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [77 vs A9s: preflop equity](https://georgelipoker.com/equity/77-vs-a9s.md) - [77 vs ATo: preflop equity](https://georgelipoker.com/equity/77-vs-ato.md) - [AQs vs 66: preflop equity](https://georgelipoker.com/equity/aqs-vs-66.md)