A5s vs 87s: preflop equity

Dealt all in against each other, A5s takes 55.81% of the pot on average and 87s takes the other 44.19%.

A5s

55.81%

Wins 55.56%, ties 0.50%

87s

44.19%

Wins 43.94%, ties 0.50%

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

A5s against 87s: the numbers

Exact preflop results for A5s against 87s, in percent
HandWinsTiesLosesEquity
A5s55.5600.49543.94555.808
87s43.9450.49555.56044.192

Two suited hands meet here: A5s against 87s. 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. 0.50% of boards are ties, so the equity of each hand is its win rate plus half of that.

Place 30 of 169 belongs to A5s and place 100 belongs to 87s in the ranking against a random hand.

Boards behind the percentages: 27,396,864 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
A5s15,222,000136,00012,040,000
87s12,040,000136,00015,222,000

The board total is exact, 16 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages.

A5s against 87s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
A5s1.2631.8002.2760.792
87s0.7922.2761.8001.263

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

Across the five flop textures A5s' equity moves by 22.19 points, from 39.28% on low rainbow flops (nine high or lower) to 61.47% on paired flops. On low rainbow flops (nine high or lower) the numbers flip and 87s is the one ahead.

A5s against 87s by flop texture, in percent
FlopShare of flopsA5s winsTies87s winsA5s equity
Rainbow, ten or higher25.22058.3110.22141.46858.422
Rainbow, nine or lower5.68939.0370.49160.47239.282
Two-tone46.72754.4670.25045.28354.592
Monotone5.27351.8603.42244.71853.571
Paired17.09161.1350.66538.20061.467

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

How much does the opponent matter? Compared with its random-hand 59.92%, A5s changes by -4.11 points, and 87s, from 47.94%, by -3.75.

A5s and 87s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
A5s, all flops55.80859.923-4.1150.93133
A5s, rainbow, ten or higher58.42259.923-1.5010.97495
A5s, rainbow, nine or lower39.28259.923-20.6410.65554
A5s, two-tone54.59259.923-5.3310.91104
A5s, monotone53.57159.923-6.3520.89400
A5s, paired61.46759.923+1.5441.02577
87s, all flops44.19247.936-3.7440.92190
87s, rainbow, ten or higher41.57847.936-6.3580.86736
87s, rainbow, nine or lower60.71847.936+12.7821.26665
87s, two-tone45.40847.936-2.5280.94726
87s, monotone46.42947.936-1.5070.96856
87s, paired38.53347.936-9.4030.80384

Does a shared suit matter?

Does suit overlap move the numbers? A5s has 57.55% when the hands share a suit and 55.23% when they do not. A5s does better with a shared suit, by 2.32 points.

A5s against 87s by suit overlap, in percent
DealsSpecific dealsShare of dealsA5s winsTies87s winsA5s equity
Share a suit425.0057.2630.57342.16457.549
No shared suit1275.0054.9930.46944.53855.228

How often this matchup comes up

You will meet this exact matchup 0.0020% of the time in a random heads-up deal: 32 of 1,624,350, counting either seat order.

A worked example

Take a $200 pot built from $100 each. A5s' equity of 55.81% is worth $111.62, a $11.62 edge, and 87s' 44.19% is worth $88.38, which is $11.62 under its stake.

Out of 1,000 deals you should see around 556 outright wins for A5s, 439 for 87s, and 5 split pots.

The same matchup from the other side

Read it from the other side: 87s against A5s is the same matchup with the numbers swapped, so 87s holds 44.19% and A5s holds 55.81%. That address sends you back to this page.

As5s against 8h7h is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength.

How this was computed

Nothing here is simulated. The 16 deals of A5s against 87s 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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