66
65.80%
Wins 65.57%, ties 0.47%
A4s
34.20%
Wins 33.96%, ties 0.47%
66 against A4s: the numbers
| Hand | Wins | Ties | Loses | Equity |
|---|---|---|---|---|
| 66 | 65.567 | 0.469 | 33.964 | 65.801 |
| A4s | 33.964 | 0.469 | 65.567 | 34.199 |
66 is a pocket pair and A4s is a suited hand. One of the other hand's cards outranks the pair and one is below it, which makes this a closer race than a pair against two small cards.
A lead of 31.60 points is large but not decisive: A4s still takes about 339 of every 1,000 deals. Ties are 0.47% of the outcomes here; each tied board gives both hands half the pot.
For context, 66 sits at number 17 of 169 starting hands and A4s at number 35 when each is run against a random hand.
| Hand | Boards won, about | Boards tied, about | Boards lost, about |
|---|---|---|---|
| 66 | 26,945,000 | 193,000 | 13,958,000 |
| A4s | 13,958,000 | 193,000 | 26,945,000 |
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.
| Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) |
|---|---|---|---|---|
| 66 | 1.924 | 1.525 | 2.944 | 0.520 |
| A4s | 0.520 | 2.944 | 1.525 | 1.924 |
The last column is the smallest pot odds, written as a pot-to-call ratio, at which a call breaks even with this equity.
Who is ahead on which flops
66 prefers low rainbow flops (nine high or lower), where it holds 78.38%, and likes monotone flops least, where it holds 62.32%. 66 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 | 66 wins | Ties | A4s wins | 66 equity |
|---|---|---|---|---|---|
| Rainbow, ten or higher | 25.220 | 65.469 | 0.251 | 34.280 | 65.594 |
| Rainbow, nine or lower | 5.689 | 78.009 | 0.733 | 21.258 | 78.375 |
| Two-tone | 46.545 | 64.620 | 0.311 | 35.069 | 64.775 |
| Monotone | 5.212 | 61.080 | 2.483 | 36.437 | 62.321 |
| Paired | 17.334 | 65.516 | 0.519 | 33.965 | 65.775 |
Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank.
Compared with a random hand
A random hand would give 66 63.29% and A4s 59.03%. Against each other the change is +2.51 points for 66 and -24.83 for A4s.
| Case | Equity here | Against a random hand | Change in points | Times the random-hand equity |
|---|---|---|---|---|
| 66, all flops | 65.801 | 63.285 | +2.516 | 1.03976 |
| 66, rainbow, ten or higher | 65.594 | 63.285 | +2.309 | 1.03649 |
| 66, rainbow, nine or lower | 78.375 | 63.285 | +15.090 | 1.23845 |
| 66, two-tone | 64.775 | 63.285 | +1.490 | 1.02354 |
| 66, monotone | 62.321 | 63.285 | -0.964 | 0.98477 |
| 66, paired | 65.775 | 63.285 | +2.490 | 1.03935 |
| A4s, all flops | 34.199 | 59.034 | -24.835 | 0.57931 |
| A4s, rainbow, ten or higher | 34.406 | 59.034 | -24.628 | 0.58282 |
| A4s, rainbow, nine or lower | 21.625 | 59.034 | -37.409 | 0.36631 |
| A4s, two-tone | 35.225 | 59.034 | -23.809 | 0.59669 |
| A4s, monotone | 37.679 | 59.034 | -21.355 | 0.63826 |
| A4s, paired | 34.225 | 59.034 | -24.809 | 0.57975 |
Does a shared suit matter?
Split by suits, the deals give 66 66.08% when the hands overlap in a suit and 65.52% when they do not. 66 does better with a shared suit, by 0.56 points.
| Deals | Specific deals | Share of deals | 66 wins | Ties | A4s wins | 66 equity |
|---|---|---|---|---|---|---|
| Share a suit | 12 | 50.00 | 65.828 | 0.512 | 33.660 | 66.084 |
| No shared suit | 12 | 50.00 | 65.305 | 0.426 | 34.269 | 65.518 |
How often this matchup comes up
Out of 1,624,350 ways to deal two seats two cards each, 24 are 66 in one seat and A4s in the other (0.0015%); with the seats swapped too, 48 (0.0030%).
A worked example
Take a $200 pot built from $100 each. 66's equity of 65.80% is worth $131.60, a $31.60 edge, and A4s' 34.20% is worth $68.40, which is $31.60 under its stake.
Scaled to 1,000 deals, that is roughly 656 wins for 66, 339 for A4s and 5 chopped pots.
The same matchup from the other side
Swap the hands and you get A4s with 34.20% against 66 with 65.80%. We keep one page per matchup, with the better-ranked hand first.
Keep exploring
6s6h against Ad4d 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
We counted every case. Each suit pattern of the 24 specific 66 against A4s 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.
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