A5s vs Q9s: preflop equity

The exact count puts A5s at 57.32% and Q9s at 42.68% when the two hands see all five board cards.

A5s

57.32%

Wins 57.07%, ties 0.51%

Q9s

42.68%

Wins 42.42%, ties 0.51%

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

A5s against Q9s: the numbers

Exact preflop results for A5s against Q9s, in percent
HandWinsTiesLosesEquity
A5s57.0650.51342.42257.321
Q9s42.4220.51357.06542.679

This is a contest between two suited hands, A5s and Q9s. The two hands share no rank, which makes this a pure matchup of card strength, straight chances and flush chances.

A5s is ahead, but Q9s is far from dead: it takes 424 of every 1,000 deals outright. 0.51% of boards are ties, so the equity of each hand is its win rate plus half of that.

By strength against a random hand, A5s holds place 30 of 169 and Q9s holds place 43.

Boards behind the percentages: 27,396,864 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
A5s15,634,000141,00011,622,000
Q9s11,622,000141,00015,634,000

16 specific deals times 1,712,304 boards gives the exact total. The won, tied and lost counts are approximations from the five-decimal percentages, rounded to the nearest thousand.

A5s against Q9s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
A5s1.3431.7522.3570.745
Q9s0.7452.3571.7521.343

The last column is the break-even price: the pot odds a call needs to offer, as a ratio of pot to call.

Who is ahead on which flops

Across the five flop textures A5s' equity moves by 7.38 points, from 54.85% on monotone flops to 62.23% on paired flops. A5s stays ahead on all five textures.

A5s against Q9s by flop texture, in percent
FlopShare of flopsA5s winsTiesQ9s winsA5s equity
Rainbow, ten or higher24.54356.3180.16243.52056.399
Rainbow, nine or lower6.36657.4470.85641.69757.875
Two-tone46.72756.0750.27643.64956.213
Monotone5.27353.1313.43143.43854.847
Paired17.09161.9120.64137.44762.232

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 -2.60 points, and Q9s, from 57.66%, by -14.98.

A5s and Q9s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
A5s, all flops57.32159.923-2.6020.95658
A5s, rainbow, ten or higher56.39959.923-3.5240.94119
A5s, rainbow, nine or lower57.87559.923-2.0480.96582
A5s, two-tone56.21359.923-3.7100.93809
A5s, monotone54.84759.923-5.0760.91529
A5s, paired62.23259.923+2.3091.03853
Q9s, all flops42.67957.664-14.9850.74013
Q9s, rainbow, ten or higher43.60157.664-14.0630.75612
Q9s, rainbow, nine or lower42.12557.664-15.5390.73053
Q9s, two-tone43.78757.664-13.8770.75935
Q9s, monotone45.15357.664-12.5110.78304
Q9s, paired37.76857.664-19.8960.65497

Does a shared suit matter?

When the hands share a suit, A5s holds 59.21%; when they do not, it holds 56.69%. A5s does better with a shared suit, by 2.52 points.

A5s against Q9s by suit overlap, in percent
DealsSpecific dealsShare of dealsA5s winsTiesQ9s winsA5s equity
Share a suit425.0058.9150.59440.49159.212
No shared suit1275.0056.4480.48643.06656.691

How often this matchup comes up

Exactly 16 specific deals fit this matchup in one seat order, which is 0.0010% of 1,624,350; both orders together give 32, or 0.0020%.

A worked example

To see what the equity is worth, imagine $100 each in a $200 pot. A5s is worth $114.64 on average (+$14.64); Q9s is worth $85.36 (-$14.64).

Out of 1,000 deals you should see around 571 outright wins for A5s, 424 for Q9s, and 5 split pots.

The same matchup from the other side

If you came looking for Q9s against A5s, the numbers are the same with the hands swapped: 42.68% and 57.32%.

The calculator link fills in As5s against Qh9h, 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

The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 16 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it.

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

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