AKs vs ATs: preflop equity

In equity, AKs against ATs stands at 70.74% to 29.26%, a gap of 41.48 points.

AKs

70.74%

Wins 68.64%, ties 4.21%

ATs

29.26%

Wins 27.15%, ties 4.21%

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

AKs against ATs: the numbers

Exact preflop results for AKs against ATs, in percent
HandWinsTiesLosesEquity
AKs68.6374.21227.15170.743
ATs27.1514.21268.63729.257

Each side holds one of the suited hands: AKs and ATs. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up.

That is a clear edge, 70.74% to 29.26%, but ATs still wins often enough that one hand proves nothing. Ties are part of the picture: 4.21% of boards end in a split pot, and each side counts that as half a win.

The hand ranking puts AKs at 8 and ATs at 13 out of 169 starting hands.

Boards behind the percentages: 20,547,648 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
AKs14,103,000865,0005,579,000
ATs5,579,000865,00014,103,000

The total is exact: 12 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.

AKs against ATs read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
AKs2.4181.4573.6830.414
ATs0.4143.6831.4572.418

In the last column, a pot-to-call ratio at or above the figure makes a call break even or better at this equity.

Who is ahead on which flops

If you know the kind of flop that came, the numbers shift: AKs holds 80.50% on low rainbow flops (nine high or lower) and 64.29% on monotone flops. AKs stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal.

AKs against ATs by flop texture, in percent
FlopShare of flopsAKs winsTiesATs winsAKs equity
Rainbow, ten or higher23.13869.4101.97228.61870.396
Rainbow, nine or lower7.77178.0214.95717.02280.499
Two-tone46.54368.7852.43828.77770.004
Monotone5.21562.0544.47733.46964.292
Paired17.33364.98111.55023.46970.756

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

Relative to a random opponent, AKs changes by +3.69 points (baseline 67.05%) and ATs by -35.34 points (baseline 64.60%).

AKs and ATs here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
AKs, all flops70.74367.045+3.6981.05516
AKs, rainbow, ten or higher70.39667.045+3.3511.04998
AKs, rainbow, nine or lower80.49967.045+13.4541.20067
AKs, two-tone70.00467.045+2.9591.04413
AKs, monotone64.29267.045-2.7530.95894
AKs, paired70.75667.045+3.7111.05535
ATs, all flops29.25764.602-35.3450.45288
ATs, rainbow, ten or higher29.60464.602-34.9980.45825
ATs, rainbow, nine or lower19.50164.602-45.1010.30186
ATs, two-tone29.99664.602-34.6060.46432
ATs, monotone35.70864.602-28.8940.55274
ATs, paired29.24464.602-35.3580.45268

Does a shared suit matter?

These two classes cannot share a suit in any legal deal, so there is only one row to read: AKs holds 70.74% in every deal of this matchup.

AKs against ATs by suit overlap, in percent
DealsSpecific dealsShare of dealsAKs winsTiesATs winsAKs equity
Share a suit00.00not possiblenot possiblenot possiblenot possible
No shared suit12100.0068.6374.21227.15170.743

How often this matchup comes up

You will meet this exact matchup 0.0015% of the time in a random heads-up deal: 24 of 1,624,350, counting either seat order.

A worked example

Put $100 each into a $200 pot and deal every board once: AKs averages $141.48 back, ahead of its $100 by $41.48, while ATs averages $58.52, short of its $100 by $41.48.

Over a long run, 1,000 deals split into about 686 for AKs, 272 for ATs and 42 tied.

The same matchup from the other side

ATs against AKs adds nothing new: it is 29.26% for ATs and 70.74% for AKs, the same figures reversed.

The calculator link fills in AsKs against AhTh, a deal where the two hands share no suit. Change any card to test your own hand. The neighboring matchups below swap one of the two hands for one of similar strength.

How this was computed

Nothing here is simulated. The 12 deals of AKs against ATs fall into a few suit patterns, each dealt against all 1,712,304 boards, with both best five-card hands compared on every board. Ties give each hand half a win, and the flop rows count a board under each of its ten flops.

Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used.

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