--- title: "KK vs 66: preflop equity" url: "https://georgelipoker.com/equity/kk-vs-66.md" canonical_url: "https://georgelipoker.com/equity/kk-vs-66" last_updated: "2026-10-23" type: "reference" summary: "KK is a big favorite over 66 before the flop: 80.49% to 19.51% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/kk-vs-a9s.md", "https://georgelipoker.com/equity/kk-vs-ato.md", "https://georgelipoker.com/equity/qq-vs-66.md"] --- # KK vs 66: preflop equity KK is a big favorite over 66 before the flop: 80.49% to 19.51% equity, counted exactly over every board, with the split by flop type and suit. Over all 1,712,304 boards that can follow this deal, KK finishes with 80.49% of the pot and 66 with 19.51%. ## KK against 66: the numbers **Exact preflop results for KK against 66, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | KK | 80.315 | 0.355 | 19.330 | 80.492 | | 66 | 19.330 | 0.355 | 80.315 | 19.508 | KK and 66 are both pocket pairs. Two pairs against each other is a one-way street: the lower pair needs one of its two remaining cards. A gap this wide means 66 is in trouble before the flop and has few good runouts. 0.36% of boards are ties, so the equity of each hand is its win rate plus half of that. Place 2 of 169 belongs to KK and place 17 belongs to 66 in the ranking against a random hand. **Boards behind the percentages: 61,642,944 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | KK | 49,509,000 | 219,000 | 11,916,000 | | 66 | 11,916,000 | 219,000 | 49,509,000 | 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. **KK 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) | | --- | --- | --- | --- | --- | | KK | 4.126 | 1.245 | 5.173 | 0.242 | | 66 | 0.242 | 5.173 | 1.245 | 4.126 | The last column is the smallest pot odds, written as a pot-to-call ratio, at which a call breaks even with this equity. ## Who is ahead on which flops Split by what the flop looks like, KK peaks at 86.45% on paired flops and bottoms out at 65.03% on low rainbow flops (nine high or lower). KK stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **KK against 66 by flop texture, in percent** | Flop | Share of flops | KK wins | Ties | 66 wins | KK equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.595 | 83.537 | 0.201 | 16.262 | 83.637 | | Rainbow, nine or lower | 6.314 | 64.625 | 0.817 | 34.558 | 65.034 | | Two-tone | 46.363 | 79.133 | 0.314 | 20.553 | 79.290 | | Monotone | 5.152 | 74.054 | 1.760 | 24.186 | 74.934 | | Paired | 17.576 | 86.395 | 0.100 | 13.505 | 86.445 | 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 Each hand has a baseline against a random hand: 82.40% for KK, 63.29% for 66. Here the change is -1.91 and -43.78 points. **KK 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 | | --- | --- | --- | --- | --- | | KK, all flops | 80.492 | 82.396 | -1.904 | 0.97689 | | KK, rainbow, ten or higher | 83.637 | 82.396 | +1.241 | 1.01506 | | KK, rainbow, nine or lower | 65.034 | 82.396 | -17.362 | 0.78929 | | KK, two-tone | 79.290 | 82.396 | -3.106 | 0.96230 | | KK, monotone | 74.934 | 82.396 | -7.462 | 0.90944 | | KK, paired | 86.445 | 82.396 | +4.049 | 1.04914 | | 66, all flops | 19.508 | 63.285 | -43.777 | 0.30826 | | 66, rainbow, ten or higher | 16.363 | 63.285 | -46.922 | 0.25856 | | 66, rainbow, nine or lower | 34.966 | 63.285 | -28.319 | 0.55252 | | 66, two-tone | 20.710 | 63.285 | -42.575 | 0.32725 | | 66, monotone | 25.066 | 63.285 | -38.219 | 0.39608 | | 66, paired | 13.555 | 63.285 | -49.730 | 0.21419 | ## Does a shared suit matter? Suit overlap shows up in the numbers. With a suit in common KK has 80.62% equity, and with none in common it has 79.84%. KK does better with a shared suit, by 0.78 points. **KK against 66 by suit overlap, in percent** | Deals | Specific deals | Share of deals | KK wins | Ties | 66 wins | KK equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 30 | 83.33 | 80.439 | 0.370 | 19.191 | 80.624 | | No shared suit | 6 | 16.67 | 79.697 | 0.277 | 20.026 | 79.835 | ## How often this matchup comes up This page stands for 36 specific-card matchups (0.0022% of 1,624,350 ordered deals), or 72 once you count the seats both ways (0.0044%). ## A worked example With $100 from each side, the $200 pot is split on average as $160.98 for KK and $39.02 for 66; the first side gains $60.98 per all-in and the second gives up $60.98. A thousand deals look like this: KK takes 803, 66 takes 193, 4 are ties. ## The same matchup from the other side If you came looking for 66 against KK, the numbers are the same with the hands swapped: 19.51% and 80.49%. ## Keep exploring Open the calculator with KsKh against 6d6c already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking. - [Open KsKh against 6d6c in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=KsKh&p2=6d6c) - [KK combos](https://georgelipoker.com/combos/kk.md) - [66 combos](https://georgelipoker.com/combos/66.md) - [KK vs A9s](https://georgelipoker.com/equity/kk-vs-a9s.md) - [KK vs ATo](https://georgelipoker.com/equity/kk-vs-ato.md) - [QQ vs 66](https://georgelipoker.com/equity/qq-vs-66.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 36 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [KK vs A9s: preflop equity](https://georgelipoker.com/equity/kk-vs-a9s.md) - [KK vs ATo: preflop equity](https://georgelipoker.com/equity/kk-vs-ato.md) - [QQ vs 66: preflop equity](https://georgelipoker.com/equity/qq-vs-66.md)