--- title: "66 vs T9s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-t9s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-t9s" last_updated: "2026-10-23" type: "reference" summary: "66 vs T9s is close to a coin flip before the flop: 49.12% to 50.88% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-33.md", "https://georgelipoker.com/equity/66-vs-t8s.md", "https://georgelipoker.com/equity/a9s-vs-t9s.md"] --- # 66 vs T9s: preflop equity 66 vs T9s is close to a coin flip before the flop: 49.12% to 50.88% equity, counted exactly over every board, with the split by flop type and suit. Before any board card is dealt, T9s holds 50.88% equity against 66, which leaves 66 with 49.12%. ## 66 against T9s: the numbers **Exact preflop results for 66 against T9s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 48.758 | 0.721 | 50.521 | 49.119 | | T9s | 50.521 | 0.721 | 48.758 | 50.881 | One side is a pocket pair, the other is a suited hand. A pair against two higher cards is the classic race: the pair is usually a small favorite or close to even, and each overcard that pairs is a way to take the lead. That is a slim edge: neither hand is far ahead. A split pot comes up on 0.72% of boards, so the wins and the equity differ by half of that. Ranked by equity against a random hand, 66 is number 17 of the 169 starting hands and T9s is number 64. **Boards behind the percentages: 41,095,296 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 20,037,000 | 296,000 | 20,762,000 | | T9s | 20,762,000 | 296,000 | 20,037,000 | The total is exact: 24 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **66 against T9s 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 | 0.965 | 2.051 | 1.979 | 1.036 | | T9s | 1.036 | 1.979 | 2.051 | 0.965 | 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 Across the five flop textures T9s' equity moves by 11.11 points, from 41.88% on low rainbow flops (nine high or lower) to 52.99% on rainbow flops topped by a ten or better. 66 is ahead on low rainbow flops (nine high or lower) and paired flops, even though it trails T9s when every flop is counted. **66 against T9s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | T9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 46.804 | 0.406 | 52.790 | 47.007 | | Rainbow, nine or lower | 5.689 | 57.896 | 0.442 | 41.662 | 58.117 | | Two-tone | 46.545 | 46.943 | 0.396 | 52.661 | 47.141 | | Monotone | 5.212 | 47.802 | 2.571 | 49.627 | 49.087 | | Paired | 17.334 | 53.766 | 1.586 | 44.648 | 54.559 | 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 Start from the random-hand figures, 63.29% for 66 and 54.03% for T9s. This opponent changes them by -14.17 and -3.15 points. **66 and T9s 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 | 49.119 | 63.285 | -14.166 | 0.77616 | | 66, rainbow, ten or higher | 47.007 | 63.285 | -16.278 | 0.74278 | | 66, rainbow, nine or lower | 58.117 | 63.285 | -5.168 | 0.91834 | | 66, two-tone | 47.141 | 63.285 | -16.144 | 0.74490 | | 66, monotone | 49.087 | 63.285 | -14.198 | 0.77565 | | 66, paired | 54.559 | 63.285 | -8.726 | 0.86212 | | T9s, all flops | 50.881 | 54.028 | -3.147 | 0.94175 | | T9s, rainbow, ten or higher | 52.993 | 54.028 | -1.035 | 0.98084 | | T9s, rainbow, nine or lower | 41.883 | 54.028 | -12.145 | 0.77521 | | T9s, two-tone | 52.859 | 54.028 | -1.169 | 0.97836 | | T9s, monotone | 50.913 | 54.028 | -3.115 | 0.94234 | | T9s, paired | 45.441 | 54.028 | -8.587 | 0.84106 | ## Does a shared suit matter? The suit split reads 50.76% for T9s with a shared suit and 51.00% without one. The two rows differ by only 0.24 points, so suits barely change this matchup. **66 against T9s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | T9s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 12 | 50.00 | 48.860 | 0.762 | 50.378 | 49.241 | | No shared suit | 12 | 50.00 | 48.657 | 0.680 | 50.663 | 48.997 | ## How often this matchup comes up Counting specific cards, 66 against T9s 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 Take a $200 pot built from $100 each. T9s' equity of 50.88% is worth $101.76, a $1.76 edge, and 66's 49.12% is worth $98.24, which is $1.76 under its stake. In 1,000 deals of exactly this matchup, expect about 505 won outright by T9s, about 488 won outright by 66 and about 7 split. ## The same matchup from the other side T9s against 66 adds nothing new: it is 50.88% for T9s and 49.12% for 66, the same figures reversed. ## Keep exploring Try 6s6h against Td9d 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 6s6h against Td9d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=Td9d) - [66 combos](https://georgelipoker.com/combos/66.md) - [T9s combos](https://georgelipoker.com/combos/t9s.md) - [66 vs 33](https://georgelipoker.com/equity/66-vs-33.md) - [66 vs T8s](https://georgelipoker.com/equity/66-vs-t8s.md) - [A9s vs T9s](https://georgelipoker.com/equity/a9s-vs-t9s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed All 1,712,304 five-card boards are dealt for every suit pattern among the 24 specific deals of 66 against T9s, and both hands are scored on each. That is a full count, so the percentages are exact. Ties are half a win each, and each board appears once per flop it contains. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [66 vs 33: preflop equity](https://georgelipoker.com/equity/66-vs-33.md) - [66 vs T8s: preflop equity](https://georgelipoker.com/equity/66-vs-t8s.md) - [A9s vs T9s: preflop equity](https://georgelipoker.com/equity/a9s-vs-t9s.md)