66
81.36%
Wins 80.39%, ties 1.95%
55
18.64%
Wins 17.66%, ties 1.95%
66 against 55: the numbers
| Hand | Wins | Ties | Loses | Equity |
|---|---|---|---|---|
| 66 | 80.385 | 1.949 | 17.666 | 81.359 |
| 55 | 17.666 | 1.949 | 80.385 | 18.641 |
Here pocket pairs face each other, 66 on one side and 55 on the other. Two pairs against each other is a one-way street: the lower pair needs one of its two remaining cards.
66 is a big favorite here before anyone sees a flop. A split pot comes up on 1.95% of boards, so the wins and the equity differ by half of that.
Place 17 of 169 belongs to 66 and place 27 belongs to 55 in the ranking against a random hand.
| Hand | Boards won, about | Boards tied, about | Boards lost, about |
|---|---|---|---|
| 66 | 49,552,000 | 1,201,000 | 10,890,000 |
| 55 | 10,890,000 | 1,201,000 | 49,552,000 |
36 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.
| Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) |
|---|---|---|---|---|
| 66 | 4.365 | 1.244 | 5.661 | 0.229 |
| 55 | 0.229 | 5.661 | 1.244 | 4.365 |
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
If you know the kind of flop that came, the numbers shift: 66 holds 84.39% on paired flops and 75.42% on low rainbow flops (nine high or lower). 66 stays ahead on all five textures.
| Flop | Share of flops | 66 wins | Ties | 55 wins | 66 equity |
|---|---|---|---|---|---|
| Rainbow, ten or higher | 25.844 | 81.989 | 1.170 | 16.841 | 82.574 |
| Rainbow, nine or lower | 5.065 | 75.099 | 0.650 | 24.251 | 75.424 |
| Two-tone | 46.363 | 80.249 | 1.069 | 18.682 | 80.783 |
| Monotone | 5.152 | 74.620 | 2.681 | 22.699 | 75.961 |
| Paired | 17.576 | 81.598 | 5.575 | 12.827 | 84.385 |
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
How much does the opponent matter? Compared with its random-hand 63.29%, 66 changes by +18.07 points, and 55, from 60.33%, by -41.69.
| Case | Equity here | Against a random hand | Change in points | Times the random-hand equity |
|---|---|---|---|---|
| 66, all flops | 81.359 | 63.285 | +18.074 | 1.28560 |
| 66, rainbow, ten or higher | 82.574 | 63.285 | +19.289 | 1.30480 |
| 66, rainbow, nine or lower | 75.424 | 63.285 | +12.139 | 1.19181 |
| 66, two-tone | 80.783 | 63.285 | +17.498 | 1.27650 |
| 66, monotone | 75.961 | 63.285 | +12.676 | 1.20030 |
| 66, paired | 84.385 | 63.285 | +21.100 | 1.33341 |
| 55, all flops | 18.641 | 60.325 | -41.684 | 0.30901 |
| 55, rainbow, ten or higher | 17.426 | 60.325 | -42.899 | 0.28887 |
| 55, rainbow, nine or lower | 24.576 | 60.325 | -35.749 | 0.40739 |
| 55, two-tone | 19.217 | 60.325 | -41.108 | 0.31856 |
| 55, monotone | 24.039 | 60.325 | -36.286 | 0.39849 |
| 55, paired | 15.615 | 60.325 | -44.710 | 0.25885 |
Does a shared suit matter?
Looking only at deals where the hands share a suit, 66 has 81.50%; looking only at deals where they do not, 80.67%. 66 does better with a shared suit, by 0.83 points.
| Deals | Specific deals | Share of deals | 66 wins | Ties | 55 wins | 66 equity |
|---|---|---|---|---|---|---|
| Share a suit | 30 | 83.33 | 80.515 | 1.963 | 17.522 | 81.497 |
| No shared suit | 6 | 16.67 | 79.734 | 1.875 | 18.391 | 80.672 |
How often this matchup comes up
Counting specific cards, 66 against 55 appears in 36 of the 1,624,350 ordered heads-up deals (0.0022%), and in 72 when the seats are swapped too (0.0044%).
A worked example
With $100 from each side, the $200 pot is split on average as $162.72 for 66 and $37.28 for 55; the first side gains $62.72 per all-in and the second gives up $62.72.
Over a long run, 1,000 deals split into about 804 for 66, 177 for 55 and 19 tied.
The same matchup from the other side
If you came looking for 55 against 66, the numbers are the same with the hands swapped: 18.64% and 81.36%.
Keep exploring
6s6h against 5d5c is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength.
How this was computed
Method: exact enumeration. The 36 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.
Bring your own hands to a session
Review the spots you actually play against these numbers in a Game Assessment, and leave with a one-page written plan.
Book a session