--- title: "K9s vs A2s: preflop equity" url: "https://georgelipoker.com/equity/k9s-vs-a2s.md" canonical_url: "https://georgelipoker.com/equity/k9s-vs-a2s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, K9s or A2s? A2s leads 58.01% to 41.99% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/k9s-vs-qto.md", "https://georgelipoker.com/equity/k9s-vs-44.md", "https://georgelipoker.com/equity/a5s-vs-a2s.md"] --- # K9s vs A2s: preflop equity Who is ahead, K9s or A2s? A2s leads 58.01% to 41.99% before the flop, counted exactly over every board, with the split by flop type and suit. The exact count puts A2s at 58.01% and K9s at 41.99% when the two hands see all five board cards. ## K9s against A2s: the numbers **Exact preflop results for K9s against A2s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | K9s | 41.719 | 0.542 | 57.739 | 41.990 | | A2s | 57.739 | 0.542 | 41.719 | 58.010 | Here suited hands face each other, K9s on one side and A2s on the other. With no overlap in ranks, every card that pairs one hand is a card that does not pair the other. A 16.02 point lead is real, and K9s still takes about 417 of every 1,000 deals outright. Ties are part of the picture: 0.54% of boards end in a split pot, and each side counts that as half a win. K9s ranks number 29 of 169 starting hands, and A2s ranks number 46, by equity against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | K9s | 11,430,000 | 148,000 | 15,819,000 | | A2s | 15,819,000 | 148,000 | 11,430,000 | 16 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. **K9s against A2s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | K9s | 0.724 | 2.397 | 1.732 | 1.382 | | A2s | 1.382 | 1.732 | 2.397 | 0.724 | 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 Split by what the flop looks like, A2s peaks at 62.95% on paired flops and bottoms out at 55.35% on monotone flops. A2s stays ahead on all five textures. **K9s against A2s by flop texture, in percent** | Flop | Share of flops | K9s wins | Ties | A2s wins | K9s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 24.543 | 42.127 | 0.173 | 57.700 | 42.213 | | Rainbow, nine or lower | 6.366 | 43.368 | 1.015 | 55.617 | 43.875 | | Two-tone | 46.727 | 42.970 | 0.306 | 56.724 | 43.123 | | Monotone | 5.273 | 42.926 | 3.445 | 53.629 | 44.649 | | Paired | 17.091 | 36.725 | 0.649 | 62.626 | 37.050 | 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 Relative to a random opponent, K9s changes by -18.00 points (baseline 59.99%) and A2s by +0.63 points (baseline 57.38%). **K9s and A2s 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 | | --- | --- | --- | --- | --- | | K9s, all flops | 41.990 | 59.988 | -17.998 | 0.69997 | | K9s, rainbow, ten or higher | 42.213 | 59.988 | -17.775 | 0.70369 | | K9s, rainbow, nine or lower | 43.875 | 59.988 | -16.113 | 0.73140 | | K9s, two-tone | 43.123 | 59.988 | -16.865 | 0.71886 | | K9s, monotone | 44.649 | 59.988 | -15.339 | 0.74430 | | K9s, paired | 37.050 | 59.988 | -22.938 | 0.61762 | | A2s, all flops | 58.010 | 57.379 | +0.631 | 1.01100 | | A2s, rainbow, ten or higher | 57.787 | 57.379 | +0.408 | 1.00711 | | A2s, rainbow, nine or lower | 56.125 | 57.379 | -1.254 | 0.97815 | | A2s, two-tone | 56.877 | 57.379 | -0.502 | 0.99125 | | A2s, monotone | 55.351 | 57.379 | -2.028 | 0.96466 | | A2s, paired | 62.950 | 57.379 | +5.571 | 1.09709 | ## Does a shared suit matter? Two kinds of deal exist here. In 4 of them the hands share a suit and A2s holds 60.00%. In 12 they do not, and it holds 57.35%. A2s does better with a shared suit, by 2.65 points. **K9s against A2s by suit overlap, in percent** | Deals | Specific deals | Share of deals | K9s wins | Ties | A2s wins | K9s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 39.690 | 0.625 | 59.685 | 40.003 | | No shared suit | 12 | 75.00 | 42.395 | 0.515 | 57.090 | 42.653 | ## How often this matchup comes up Exactly 16 specific deals fit this matchup in one seat order, which is 0.0010% of 1,624,350; both orders together give 32, or 0.0020%. ## A worked example With $100 from each side, the $200 pot is split on average as $116.02 for A2s and $83.98 for K9s; the first side gains $16.02 per all-in and the second gives up $16.02. Think in thousands: about 577 of 1,000 go to A2s, about 417 go to K9s, and about 6 are chopped. ## The same matchup from the other side The mirror image, A2s against K9s, is 58.01% to 41.99%, and its address redirects to this page. ## Keep exploring Try Ks9s against Ah2h 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 Ks9s against Ah2h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=Ks9s&p2=Ah2h) - [K9s combos](https://georgelipoker.com/combos/k9s.md) - [A2s combos](https://georgelipoker.com/combos/a2s.md) - [K9s vs QTo](https://georgelipoker.com/equity/k9s-vs-qto.md) - [K9s vs 44](https://georgelipoker.com/equity/k9s-vs-44.md) - [A5s vs A2s](https://georgelipoker.com/equity/a5s-vs-a2s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed Method: exact enumeration. The 16 specific deals are grouped by suit pattern, each is run against all 1,712,304 boards, and both seven-card hands are scored. Equity adds half of every tie, and flop textures are tallied over the ten flops inside each board. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [K9s vs QTo: preflop equity](https://georgelipoker.com/equity/k9s-vs-qto.md) - [K9s vs 44: preflop equity](https://georgelipoker.com/equity/k9s-vs-44.md) - [A5s vs A2s: preflop equity](https://georgelipoker.com/equity/a5s-vs-a2s.md)