99
81.18%
Wins 80.86%, ties 0.64%
66
18.82%
Wins 18.50%, ties 0.64%
99 against 66: the numbers
| Hand | Wins | Ties | Loses | Equity |
|---|---|---|---|---|
| 99 | 80.861 | 0.644 | 18.495 | 81.183 |
| 66 | 18.495 | 0.644 | 80.861 | 18.817 |
Each side holds one of the pocket pairs: 99 and 66. Both hands are pairs, so the bigger pair is ahead on every board that does not pair a card below it.
A gap this wide means 66 is in trouble before the flop and has few good runouts. Ties are part of the picture: 0.64% of boards end in a split pot, and each side counts that as half a win.
Among the 169 starting hands, 99 is number 6 and 66 is number 17 by strength against a random hand.
| Hand | Boards won, about | Boards tied, about | Boards lost, about |
|---|---|---|---|
| 99 | 49,845,000 | 397,000 | 11,401,000 |
| 66 | 11,401,000 | 397,000 | 49,845,000 |
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) |
|---|---|---|---|---|
| 99 | 4.314 | 1.237 | 5.407 | 0.232 |
| 66 | 0.232 | 5.407 | 1.237 | 4.314 |
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
Across the five flop textures 99's equity moves by 15.78 points, from 70.35% on low rainbow flops (nine high or lower) to 86.13% on paired flops. 99 stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal.
| Flop | Share of flops | 99 wins | Ties | 66 wins | 99 equity |
|---|---|---|---|---|---|
| Rainbow, ten or higher | 25.844 | 82.638 | 0.372 | 16.990 | 82.824 |
| Rainbow, nine or lower | 5.065 | 70.044 | 0.620 | 29.336 | 70.354 |
| Two-tone | 46.363 | 79.995 | 0.402 | 19.603 | 80.196 |
| Monotone | 5.152 | 74.673 | 1.857 | 23.470 | 75.602 |
| Paired | 17.576 | 85.463 | 1.334 | 13.203 | 86.130 |
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
How much does the opponent matter? Compared with its random-hand 72.06%, 99 changes by +9.12 points, and 66, from 63.29%, by -44.47.
| Case | Equity here | Against a random hand | Change in points | Times the random-hand equity |
|---|---|---|---|---|
| 99, all flops | 81.183 | 72.057 | +9.126 | 1.12665 |
| 99, rainbow, ten or higher | 82.824 | 72.057 | +10.767 | 1.14942 |
| 99, rainbow, nine or lower | 70.354 | 72.057 | -1.703 | 0.97637 |
| 99, two-tone | 80.196 | 72.057 | +8.139 | 1.11295 |
| 99, monotone | 75.602 | 72.057 | +3.545 | 1.04920 |
| 99, paired | 86.130 | 72.057 | +14.073 | 1.19530 |
| 66, all flops | 18.817 | 63.285 | -44.468 | 0.29734 |
| 66, rainbow, ten or higher | 17.176 | 63.285 | -46.109 | 0.27141 |
| 66, rainbow, nine or lower | 29.646 | 63.285 | -33.639 | 0.46845 |
| 66, two-tone | 19.804 | 63.285 | -43.481 | 0.31293 |
| 66, monotone | 24.398 | 63.285 | -38.887 | 0.38553 |
| 66, paired | 13.870 | 63.285 | -49.415 | 0.21917 |
Does a shared suit matter?
Of the deals of this matchup, 30 share a suit (99 at 81.32%) and 6 do not (80.51%). 99 does better with a shared suit, by 0.81 points.
| Deals | Specific deals | Share of deals | 99 wins | Ties | 66 wins | 99 equity |
|---|---|---|---|---|---|---|
| Share a suit | 30 | 83.33 | 80.988 | 0.660 | 18.352 | 81.318 |
| No shared suit | 6 | 16.67 | 80.225 | 0.567 | 19.208 | 80.508 |
How often this matchup comes up
The class pair covers 36 combinations of specific cards in a fixed seat order, 0.0022% of 1,624,350, and 72 (0.0044%) in either order.
A worked example
To see what the equity is worth, imagine $100 each in a $200 pot. 99 is worth $162.36 on average (+$62.36); 66 is worth $37.64 (-$62.36).
Over a long run, 1,000 deals split into about 809 for 99, 185 for 66 and 6 tied.
The same matchup from the other side
66 against 99 adds nothing new: it is 18.82% for 66 and 81.18% for 99, the same figures reversed.
Keep exploring
9s9h against 6d6c 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
Each figure is a complete count over boards. Take the 36 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.
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