--- title: "66 vs K9s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-k9s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-k9s" last_updated: "2026-10-23" type: "reference" summary: "66 vs K9s is close to a coin flip before the flop: 52.17% to 47.83% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-a5s.md", "https://georgelipoker.com/equity/66-vs-a6s.md", "https://georgelipoker.com/equity/a9s-vs-k9s.md"] --- # 66 vs K9s: preflop equity 66 vs K9s is close to a coin flip before the flop: 52.17% to 47.83% equity, counted exactly over every board, with the split by flop type and suit. Averaged over every possible board, 66 is ahead of K9s by 4.34 points of equity, 52.17% to 47.83%. ## 66 against K9s: the numbers **Exact preflop results for 66 against K9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 51.928 | 0.489 | 47.583 | 52.172 | | K9s | 47.583 | 0.489 | 51.928 | 47.828 | The matchup pits a pocket pair against a suited hand. One hand holds a pair and the other holds two cards that both outrank it, which keeps the equity closer than most people expect. This is close to even money, with 66 a little ahead. Ties are 0.49% of the outcomes here; each tied board gives both hands half the pot. By strength against a random hand, 66 holds place 17 of 169 and K9s holds place 29. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 21,340,000 | 201,000 | 19,554,000 | | K9s | 19,554,000 | 201,000 | 21,340,000 | 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 K9s 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 | 1.091 | 1.926 | 2.102 | 0.917 | | K9s | 0.917 | 2.102 | 1.926 | 1.091 | 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 Low rainbow flops (nine high or lower) are the best for 66 (62.53%); two-tone flops are the worst (50.51%). 66 stays ahead on all five textures. **66 against K9s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | K9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 50.456 | 0.240 | 49.304 | 50.576 | | Rainbow, nine or lower | 5.689 | 62.228 | 0.605 | 37.167 | 62.530 | | Two-tone | 46.545 | 50.365 | 0.288 | 49.347 | 50.509 | | Monotone | 5.212 | 50.247 | 2.477 | 47.276 | 51.485 | | Paired | 17.334 | 55.391 | 0.752 | 43.857 | 55.767 | 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: 63.29% for 66, 59.99% for K9s. Here the change is -11.12 and -12.16 points. **66 and K9s 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 | 52.172 | 63.285 | -11.113 | 0.82440 | | 66, rainbow, ten or higher | 50.576 | 63.285 | -12.709 | 0.79918 | | 66, rainbow, nine or lower | 62.530 | 63.285 | -0.755 | 0.98807 | | 66, two-tone | 50.509 | 63.285 | -12.776 | 0.79812 | | 66, monotone | 51.485 | 63.285 | -11.800 | 0.81354 | | 66, paired | 55.767 | 63.285 | -7.518 | 0.88120 | | K9s, all flops | 47.828 | 59.988 | -12.160 | 0.79729 | | K9s, rainbow, ten or higher | 49.424 | 59.988 | -10.564 | 0.82390 | | K9s, rainbow, nine or lower | 37.470 | 59.988 | -22.518 | 0.62462 | | K9s, two-tone | 49.491 | 59.988 | -10.497 | 0.82502 | | K9s, monotone | 48.515 | 59.988 | -11.473 | 0.80875 | | K9s, paired | 44.233 | 59.988 | -15.755 | 0.73736 | ## Does a shared suit matter? The suit split reads 52.35% for 66 with a shared suit and 52.00% without one. 66 does better with a shared suit, by 0.35 points. **66 against K9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | K9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 52.080 | 0.531 | 47.389 | 52.345 | | No shared suit | 12 | 50.00 | 51.775 | 0.447 | 47.778 | 51.999 | ## How often this matchup comes up Counting specific cards, 66 against K9s appears in 24 of the 1,624,350 ordered heads-up deals (0.0015%), and in 48 when the seats are swapped too (0.0030%). ## A worked example A $100 all-in from each player makes a $200 pot, and the exact equity says 66 gets $104.34 of it on average and K9s gets $95.66. In 1,000 deals of exactly this matchup, expect about 519 won outright by 66, about 476 won outright by K9s and about 5 split. ## The same matchup from the other side K9s against 66 adds nothing new: it is 47.83% for K9s and 52.17% for 66, the same figures reversed. ## Keep exploring Open the calculator with 6s6h against Kd9d 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 6s6h against Kd9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Kd9d) - [66 combos](https://georgelipoker.com/combos/66.md) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [66 vs A5s](https://georgelipoker.com/equity/66-vs-a5s.md) - [66 vs A6s](https://georgelipoker.com/equity/66-vs-a6s.md) - [A9s vs K9s](https://georgelipoker.com/equity/a9s-vs-k9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Each figure is a complete count over boards. Take the 24 specific deals, group them by suit pattern, deal all 1,712,304 boards against each, and compare the two seven-card hands. Equity counts a tie as half a win; the flop rows use every one of a board's ten flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [66 vs A5s: preflop equity](https://georgelipoker.com/equity/66-vs-a5s.md) - [66 vs A6s: preflop equity](https://georgelipoker.com/equity/66-vs-a6s.md) - [A9s vs K9s: preflop equity](https://georgelipoker.com/equity/a9s-vs-k9s.md)