A8s vs A3s: preflop equity

Over all 1,712,304 boards that can follow this deal, A8s finishes with 63.60% of the pot and A3s with 36.40%.

A8s

63.60%

Wins 54.08%, ties 19.03%

A3s

36.40%

Wins 26.89%, ties 19.03%

Equity counts a tie as half a win. Exact over every board.

A8s against A3s: the numbers

Exact preflop results for A8s against A3s, in percent
HandWinsTiesLosesEquity
A8s54.08319.02726.89063.596
A3s26.89019.02754.08336.404

A8s meets A3s, and both are suited hands. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing.

A 27.20 point lead is real, and A3s still takes about 269 of every 1,000 deals outright. About 19.03% of boards chop the pot, which is why equity sits slightly above the win figure for both hands.

For context, A8s sits at number 21 of 169 starting hands and A3s at number 38 when each is run against a random hand.

Boards behind the percentages: 20,547,648 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
A8s11,113,0003,910,0005,525,000
A3s5,525,0003,910,00011,113,000

12 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.

A8s against A3s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
A8s1.7471.8493.7190.572
A3s0.5723.7191.8491.747

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: A8s holds 66.30% on rainbow flops topped by a ten or better and 59.38% on paired flops. A8s stays ahead on all five textures.

A8s against A3s by flop texture, in percent
FlopShare of flopsA8s winsTiesA3s winsA8s equity
Rainbow, ten or higher24.52656.57919.44923.97266.304
Rainbow, nine or lower6.38362.1275.78232.09165.018
Two-tone46.54356.53714.81628.64763.945
Monotone5.21553.22113.58933.19060.015
Paired17.33341.25836.24822.49459.382

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

The table below sets each hand against its own random-hand baseline: a change of +1.66 points for A8s, from 61.94%, and -21.82 for A3s, from 58.22%.

A8s and A3s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
A8s, all flops63.59661.944+1.6521.02667
A8s, rainbow, ten or higher66.30461.944+4.3601.07039
A8s, rainbow, nine or lower65.01861.944+3.0741.04963
A8s, two-tone63.94561.944+2.0011.03230
A8s, monotone60.01561.944-1.9290.96886
A8s, paired59.38261.944-2.5620.95864
A3s, all flops36.40458.220-21.8160.62528
A3s, rainbow, ten or higher33.69658.220-24.5240.57877
A3s, rainbow, nine or lower34.98258.220-23.2380.60086
A3s, two-tone36.05558.220-22.1650.61929
A3s, monotone39.98558.220-18.2350.68679
A3s, paired40.61858.220-17.6020.69766

Does a shared suit matter?

Every legal deal of A8s against A3s leaves the hands with no suit in common, so the suit split does not apply here.

A8s against A3s by suit overlap, in percent
DealsSpecific dealsShare of dealsA8s winsTiesA3s winsA8s equity
Share a suit00.00not possiblenot possiblenot possiblenot possible
No shared suit12100.0054.08319.02726.89063.596

How often this matchup comes up

Out of 1,624,350 ways to deal two seats two cards each, 12 are A8s in one seat and A3s in the other (0.0007%); with the seats swapped too, 24 (0.0015%).

A worked example

Put $100 each into a $200 pot and deal every board once: A8s averages $127.20 back, ahead of its $100 by $27.20, while A3s averages $72.80, short of its $100 by $27.20.

Over a long run, 1,000 deals split into about 541 for A8s, 269 for A3s and 190 tied.

The same matchup from the other side

If you came looking for A3s against A8s, the numbers are the same with the hands swapped: 36.40% and 63.60%.

Try As8s against Ah3h 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.

How this was computed

Each figure is a complete count over boards. Take the 12 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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