--- title: "66 vs 65s: preflop equity" url: "https://georgelipoker.com/equity/66-vs-65s.md" canonical_url: "https://georgelipoker.com/equity/66-vs-65s" last_updated: "2026-10-23" type: "reference" summary: "66 is a big favorite over 65s before the flop: 81.41% to 18.59% equity, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/66-vs-54s.md", "https://georgelipoker.com/equity/66-vs-64s.md", "https://georgelipoker.com/equity/a9s-vs-65s.md"] --- # 66 vs 65s: preflop equity 66 is a big favorite over 65s before the flop: 81.41% to 18.59% equity, counted exactly over every board, with the split by flop type and suit. If 66 and 65s get all the chips in before the flop, 66 owns 81.41% of the pot in the long run and 65s owns 18.59%. ## 66 against 65s: the numbers **Exact preflop results for 66 against 65s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | 66 | 79.159 | 4.508 | 16.333 | 81.413 | | 65s | 16.333 | 4.508 | 79.159 | 18.587 | 66 is a pocket pair and 65s is a suited hand. The non-pair hand shares a rank with the pair, so two of its outs for pairing are blocked by the pair itself. 66 is a big favorite here before anyone sees a flop. Ties are part of the picture: 4.51% of boards end in a split pot, and each side counts that as half a win. By strength against a random hand, 66 holds place 17 of 169 and 65s holds place 128. **Boards behind the percentages: 20,547,648 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | 66 | 16,265,000 | 926,000 | 3,356,000 | | 65s | 3,356,000 | 926,000 | 16,265,000 | Exact total: 12 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate. **66 against 65s 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 | 4.380 | 1.263 | 6.123 | 0.228 | | 65s | 0.228 | 6.123 | 1.263 | 4.380 | 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 Rainbow flops topped by a ten or better are the best for 66 (87.41%); low rainbow flops (nine high or lower) are the worst (70.42%). 66 stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal. **66 against 65s by flop texture, in percent** | Flop | Share of flops | 66 wins | Ties | 65s wins | 66 equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.786 | 86.013 | 2.802 | 11.185 | 87.414 | | Rainbow, nine or lower | 4.995 | 66.270 | 8.297 | 25.433 | 70.419 | | Two-tone | 46.236 | 78.537 | 3.438 | 18.025 | 80.256 | | Monotone | 5.152 | 71.456 | 4.102 | 24.442 | 73.507 | | Paired | 17.831 | 76.696 | 8.807 | 14.497 | 81.099 | A rainbow flop shows three suits, a two-tone flop repeats one suit, a monotone flop is a single suit, and a paired flop repeats a rank. ## Compared with a random hand Compared with a random opponent, this matchup shifts 66 from 63.29% by +18.12 points and 65s from 43.13% by -24.54 points. **66 and 65s 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 | 81.413 | 63.285 | +18.128 | 1.28645 | | 66, rainbow, ten or higher | 87.414 | 63.285 | +24.129 | 1.38128 | | 66, rainbow, nine or lower | 70.419 | 63.285 | +7.134 | 1.11273 | | 66, two-tone | 80.256 | 63.285 | +16.971 | 1.26817 | | 66, monotone | 73.507 | 63.285 | +10.222 | 1.16152 | | 66, paired | 81.099 | 63.285 | +17.814 | 1.28149 | | 65s, all flops | 18.587 | 43.133 | -24.546 | 0.43092 | | 65s, rainbow, ten or higher | 12.586 | 43.133 | -30.547 | 0.29180 | | 65s, rainbow, nine or lower | 29.581 | 43.133 | -13.552 | 0.68581 | | 65s, two-tone | 19.744 | 43.133 | -23.389 | 0.45775 | | 65s, monotone | 26.493 | 43.133 | -16.640 | 0.61422 | | 65s, paired | 18.901 | 43.133 | -24.232 | 0.43820 | ## Does a shared suit matter? 66 and 65s never overlap in suit in a legal deal, so the whole matchup sits in the no-shared-suit row. **66 against 65s by suit overlap, in percent** | Deals | Specific deals | Share of deals | 66 wins | Ties | 65s wins | 66 equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 0 | 0.00 | not possible | not possible | not possible | not possible | | No shared suit | 12 | 100.00 | 79.159 | 4.508 | 16.333 | 81.413 | ## How often this matchup comes up How often does it happen? 12 of the 1,624,350 ordered deals (0.0007%) are 66 against 65s, and 24 (0.0015%) if either hand may sit in either seat. ## A worked example Take a $200 pot built from $100 each. 66's equity of 81.41% is worth $162.82, a $62.82 edge, and 65s' 18.59% is worth $37.18, which is $62.82 under its stake. Over a long run, 1,000 deals split into about 792 for 66, 163 for 65s and 45 tied. ## The same matchup from the other side 65s against 66 adds nothing new: it is 18.59% for 65s and 81.41% for 66, the same figures reversed. ## Keep exploring Open the calculator with 6s6h against 6d5d 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 6d5d in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=6s6h&p2=6d5d) - [66 combos](https://georgelipoker.com/combos/66.md) - [65s combos](https://georgelipoker.com/combos/65s.md) - [66 vs 54s](https://georgelipoker.com/equity/66-vs-54s.md) - [66 vs 64s](https://georgelipoker.com/equity/66-vs-64s.md) - [A9s vs 65s](https://georgelipoker.com/equity/a9s-vs-65s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed We counted every case. Each suit pattern of the 12 specific 66 against 65s deals meets all 1,712,304 boards, and the better five-card hand wins; a split pot is half a win each. The flop table reads each board under all ten of its three-card flops. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [66 vs 54s: preflop equity](https://georgelipoker.com/equity/66-vs-54s.md) - [66 vs 64s: preflop equity](https://georgelipoker.com/equity/66-vs-64s.md) - [A9s vs 65s: preflop equity](https://georgelipoker.com/equity/a9s-vs-65s.md)