ATs vs 54s: preflop equity

The exact count puts ATs at 61.89% and 54s at 38.11% when the two hands see all five board cards.

ATs

61.89%

Wins 61.62%, ties 0.55%

54s

38.11%

Wins 37.83%, ties 0.55%

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

ATs against 54s: the numbers

Exact preflop results for ATs against 54s, in percent
HandWinsTiesLosesEquity
ATs61.6160.54537.83961.888
54s37.8390.54561.61638.112

Two suited hands meet here: ATs against 54s. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits.

A 23.78 point lead is real, and 54s still takes about 378 of every 1,000 deals outright. Ties are 0.55% of the outcomes here; each tied board gives both hands half the pot.

Ranked by equity against a random hand, ATs is number 13 of the 169 starting hands and 54s is number 136.

Boards behind the percentages: 27,396,864 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
ATs16,881,000149,00010,367,000
54s10,367,000149,00016,881,000

The total is exact: 16 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.

ATs against 54s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
ATs1.6241.6232.6430.616
54s0.6162.6431.6231.624

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

If you know the kind of flop that came, the numbers shift: ATs holds 68.26% on rainbow flops topped by a ten or better and 37.01% on low rainbow flops (nine high or lower). On low rainbow flops (nine high or lower) the numbers flip and 54s is the one ahead.

ATs against 54s by flop texture, in percent
FlopShare of flopsATs winsTies54s winsATs equity
Rainbow, ten or higher24.59568.1460.22731.62768.259
Rainbow, nine or lower6.31436.6490.73062.62137.014
Two-tone46.72760.9210.30238.77761.072
Monotone5.27357.4183.54839.03459.192
Paired17.09164.6380.67034.69264.973

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

Compared with a random opponent, this matchup shifts ATs from 64.60% by -2.71 points and 54s from 41.45% by -3.34 points.

ATs and 54s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
ATs, all flops61.88864.602-2.7140.95799
ATs, rainbow, ten or higher68.25964.602+3.6571.05661
ATs, rainbow, nine or lower37.01464.602-27.5880.57295
ATs, two-tone61.07264.602-3.5300.94536
ATs, monotone59.19264.602-5.4100.91626
ATs, paired64.97364.602+0.3711.00574
54s, all flops38.11241.453-3.3410.91940
54s, rainbow, ten or higher31.74141.453-9.7120.76571
54s, rainbow, nine or lower62.98641.453+21.5331.51946
54s, two-tone38.92841.453-2.5250.93909
54s, monotone40.80841.453-0.6450.98444
54s, paired35.02741.453-6.4260.84498

Does a shared suit matter?

Looking only at deals where the hands share a suit, ATs has 64.09%; looking only at deals where they do not, 61.16%. ATs does better with a shared suit, by 2.93 points.

ATs against 54s by suit overlap, in percent
DealsSpecific dealsShare of dealsATs winsTies54s winsATs equity
Share a suit425.0063.7750.62435.60164.087
No shared suit1275.0060.8970.51838.58561.156

How often this matchup comes up

Counting specific cards, ATs against 54s appears in 16 of the 1,624,350 ordered heads-up deals (0.0010%), and in 32 when the seats are swapped too (0.0020%).

A worked example

A $100 all-in from each player makes a $200 pot, and the exact equity says ATs gets $123.78 of it on average and 54s gets $76.22.

Run 1,000 deals and the tally comes out near 616 for ATs, 378 for 54s and 6 ties.

The same matchup from the other side

54s versus ATs is this same page seen from the other hand: 38.11% for 54s, 61.89% for ATs.

The calculator link fills in AsTs against 5h4h, 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

All 1,712,304 five-card boards are dealt for every suit pattern among the 16 specific deals of ATs against 54s, and both hands are scored on each. That is a full count, so the percentages are exact. Ties are half a win each, and each board appears once per flop it contains.

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

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