ATo vs 97s: preflop equity

Before any board card is dealt, ATo holds 60.42% equity against 97s, which leaves 97s with 39.58%.

ATo

60.42%

Wins 60.22%, ties 0.41%

97s

39.58%

Wins 39.37%, ties 0.41%

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

ATo against 97s: the numbers

Exact preflop results for ATo against 97s, in percent
HandWinsTiesLosesEquity
ATo60.2180.41239.37060.424
97s39.3700.41260.21839.576

ATo is an offsuit hand and 97s is a suited hand. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits.

That is a modest edge, the kind that shows up over many hands and is easy to miss in one. Split pots make up 0.41% of the boards, and both equity figures count them as half a win each.

In the ranking of all 169 starting hands, ATo is number 19 and 97s is number 94.

Boards behind the percentages: 82,190,592 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
ATo49,494,000339,00032,358,000
97s32,358,000339,00049,494,000

Exact total: 48 deals times 1,712,304 boards. The other three counts come from the five-decimal percentages and are rounded to the nearest thousand, so read them as approximate.

ATo against 97s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
ATo1.5271.6612.5400.655
97s0.6552.5401.6611.527

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: ATo holds 67.64% on rainbow flops topped by a ten or better and 38.11% on low rainbow flops (nine high or lower). 97s takes over on low rainbow flops (nine high or lower), so the favorite before the flop is the underdog on those boards.

ATo against 97s by flop texture, in percent
FlopShare of flopsATo winsTies97s winsATo equity
Rainbow, ten or higher24.71767.5450.19432.26167.642
Rainbow, nine or lower6.31337.8920.43061.67838.107
Two-tone46.66758.6920.22641.08258.805
Monotone5.21257.3852.34540.27058.557
Paired17.09162.8990.64136.46063.219

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

Each hand has a baseline against a random hand: 62.72% for ATo, 49.12% for 97s. Here the change is -2.30 and -9.54 points.

ATo and 97s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
ATo, all flops60.42462.722-2.2980.96336
ATo, rainbow, ten or higher67.64262.722+4.9201.07844
ATo, rainbow, nine or lower38.10762.722-24.6150.60755
ATo, two-tone58.80562.722-3.9170.93755
ATo, monotone58.55762.722-4.1650.93360
ATo, paired63.21962.722+0.4971.00792
97s, all flops39.57649.118-9.5420.80573
97s, rainbow, ten or higher32.35849.118-16.7600.65878
97s, rainbow, nine or lower61.89349.118+12.7751.26009
97s, two-tone41.19549.118-7.9230.83869
97s, monotone41.44349.118-7.6750.84374
97s, paired36.78149.118-12.3370.74883

Does a shared suit matter?

Two kinds of deal exist here. In 24 of them the hands share a suit and ATo holds 61.11%. In 24 they do not, and it holds 59.74%. ATo does better with a shared suit, by 1.37 points.

ATo against 97s by suit overlap, in percent
DealsSpecific dealsShare of dealsATo winsTies97s winsATo equity
Share a suit2450.0060.8830.45438.66361.110
No shared suit2450.0059.5530.37140.07659.738

How often this matchup comes up

Exactly 48 specific deals fit this matchup in one seat order, which is 0.0030% of 1,624,350; both orders together give 96, or 0.0059%.

A worked example

To see what the equity is worth, imagine $100 each in a $200 pot. ATo is worth $120.84 on average (+$20.84); 97s is worth $79.16 (-$20.84).

Over a long run, 1,000 deals split into about 602 for ATo, 394 for 97s and 4 tied.

The same matchup from the other side

Read it from the other side: 97s against ATo is the same matchup with the numbers swapped, so 97s holds 39.58% and ATo holds 60.42%. That address sends you back to this page.

Open the calculator with AsTh against 9d7d already entered, a deal with no shared suit, and change any card to try your own hand. The matchups after it each swap one hand for a nearby one in the ranking.

How this was computed

All 1,712,304 five-card boards are dealt for every suit pattern among the 48 specific deals of ATo against 97s, 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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