AJo vs A9s: preflop equity

Dealt all in against each other, AJo takes 68.81% of the pot on average and A9s takes the other 31.19%.

AJo

68.81%

Wins 65.09%, ties 7.45%

A9s

31.19%

Wins 27.46%, ties 7.45%

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

AJo against A9s: the numbers

Exact preflop results for AJo against A9s, in percent
HandWinsTiesLosesEquity
AJo65.0877.45427.45968.814
A9s27.4597.45465.08731.186

AJo and A9s are an offsuit hand and a suited hand, in that order. Sharing a rank is the signature of a dominated hand, since the weaker hand is usually out-kicked when the shared rank shows up.

A lead of 37.62 points is large but not decisive: A9s still takes about 275 of every 1,000 deals. The tie share is 7.45%: on those boards the pot is chopped and neither hand wins outright.

The hand ranking puts AJo at 15 and A9s at 18 out of 169 starting hands.

Boards behind the percentages: 61,642,944 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
AJo40,122,0004,595,00016,927,000
A9s16,927,0004,595,00040,122,000

Exact total: 36 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.

AJo against A9s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
AJo2.2071.5363.6420.453
A9s0.4533.6421.5362.207

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

By flop texture, AJo's equity runs from 58.73% on low rainbow flops (nine high or lower) up to 75.75% on rainbow flops topped by a ten or better. AJo stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal.

AJo against A9s by flop texture, in percent
FlopShare of flopsAJo winsTiesA9s winsAJo equity
Rainbow, ten or higher23.90572.9875.52921.48475.752
Rainbow, nine or lower7.04256.5424.36839.09058.726
Two-tone46.52765.5744.96729.45968.057
Monotone5.19260.9375.85033.21363.862
Paired17.33457.59918.52223.87966.860

Read the flop types this way: rainbow has three suits, two-tone has two cards of one suit, monotone has three, and paired repeats a rank.

Compared with a random hand

Relative to a random opponent, AJo changes by +5.25 points (baseline 63.56%) and A9s by -31.59 points (baseline 62.78%).

AJo and A9s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
AJo, all flops68.81463.563+5.2511.08261
AJo, rainbow, ten or higher75.75263.563+12.1891.19176
AJo, rainbow, nine or lower58.72663.563-4.8370.92390
AJo, two-tone68.05763.563+4.4941.07070
AJo, monotone63.86263.563+0.2991.00470
AJo, paired66.86063.563+3.2971.05187
A9s, all flops31.18662.781-31.5950.49674
A9s, rainbow, ten or higher24.24862.781-38.5330.38623
A9s, rainbow, nine or lower41.27462.781-21.5070.65743
A9s, two-tone31.94362.781-30.8380.50880
A9s, monotone36.13862.781-26.6430.57562
A9s, paired33.14062.781-29.6410.52787

Does a shared suit matter?

When the hands share a suit, AJo holds 69.62%; when they do not, it holds 68.41%. AJo does better with a shared suit, by 1.21 points.

AJo against A9s by suit overlap, in percent
DealsSpecific dealsShare of dealsAJo winsTiesA9s winsAJo equity
Share a suit1233.3365.8407.56126.59969.621
No shared suit2466.6764.7107.40127.88968.411

How often this matchup comes up

AJo against A9s is made up of 36 specific-card matchups in one seat order, 0.0022% of the 1,624,350 ordered deals, and 72 counting both seat orders, 0.0044%.

A worked example

A $100 all-in from each player makes a $200 pot, and the exact equity says AJo gets $137.62 of it on average and A9s gets $62.38.

Run 1,000 deals and the tally comes out near 651 for AJo, 275 for A9s and 74 ties.

The same matchup from the other side

Swap the hands and you get A9s with 31.19% against AJo with 68.81%. We keep one page per matchup, with the better-ranked hand first.

The calculator link fills in AsJh against Ad9d, 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

Each figure is a complete count over boards. Take the 36 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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