99 vs J9s: preflop equity

In equity, 99 against J9s stands at 62.56% to 37.44%, a gap of 25.12 points.

99

62.56%

Wins 61.58%, ties 1.96%

J9s

37.44%

Wins 36.46%, ties 1.96%

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

99 against J9s: the numbers

Exact preflop results for 99 against J9s, in percent
HandWinsTiesLosesEquity
9961.5801.96036.46062.560
J9s36.4601.96061.58037.440

One side is a pocket pair, the other is a suited hand. The non-pair hand shares a rank with the pair, so two of its outs for pairing are blocked by the pair itself.

99 is ahead, but J9s is far from dead: it takes 364 of every 1,000 deals outright. About 1.96% of boards chop the pot, which is why equity sits slightly above the win figure for both hands.

For context, 99 sits at number 6 of 169 starting hands and J9s at number 55 when each is run against a random hand.

Boards behind the percentages: 20,547,648 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
9912,653,000403,0007,492,000
J9s7,492,000403,00012,653,000

The board total is exact, 12 deals at 1,712,304 boards each. Won, tied and lost counts are rounded to the nearest thousand from the five-decimal percentages.

99 against J9s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
991.6711.6242.7430.598
J9s0.5982.7431.6241.671

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 99's equity moves by 21.76 points, from 59.20% on rainbow flops topped by a ten or better to 80.96% on low rainbow flops (nine high or lower). 99 stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal.

99 against J9s by flop texture, in percent
FlopShare of flops99 winsTiesJ9s wins99 equity
Rainbow, ten or higher25.19758.2261.93939.83559.195
Rainbow, nine or lower5.58579.3073.30917.38480.962
Two-tone46.23659.1172.00438.87960.119
Monotone5.15157.7902.82439.38659.202
Paired17.83168.2481.20430.54868.850

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

The table below sets each hand against its own random-hand baseline: a change of -9.50 points for 99, from 72.06%, and -18.22 for J9s, from 55.66%.

99 and J9s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
99, all flops62.56072.057-9.4970.86820
99, rainbow, ten or higher59.19572.057-12.8620.82150
99, rainbow, nine or lower80.96272.057+8.9051.12358
99, two-tone60.11972.057-11.9380.83433
99, monotone59.20272.057-12.8550.82160
99, paired68.85072.057-3.2070.95549
J9s, all flops37.44055.662-18.2220.67263
J9s, rainbow, ten or higher40.80555.662-14.8570.73309
J9s, rainbow, nine or lower19.03855.662-36.6240.34203
J9s, two-tone39.88155.662-15.7810.71649
J9s, monotone40.79855.662-14.8640.73296
J9s, paired31.15055.662-24.5120.55963

Does a shared suit matter?

These two classes cannot share a suit in any legal deal, so there is only one row to read: 99 holds 62.56% in every deal of this matchup.

99 against J9s by suit overlap, in percent
DealsSpecific dealsShare of deals99 winsTiesJ9s wins99 equity
Share a suit00.00not possiblenot possiblenot possiblenot possible
No shared suit12100.0061.5801.96036.46062.560

How often this matchup comes up

Counting specific cards, 99 against J9s appears in 12 of the 1,624,350 ordered heads-up deals (0.0007%), and in 24 when the seats are swapped too (0.0015%).

A worked example

Put $100 each into a $200 pot and deal every board once: 99 averages $125.12 back, ahead of its $100 by $25.12, while J9s averages $74.88, short of its $100 by $25.12.

Over a long run, 1,000 deals split into about 616 for 99, 364 for J9s and 20 tied.

The same matchup from the other side

The reversed view, J9s against 99, shows 37.44% for J9s and 62.56% for 99. It is the same count, so it redirects here.

Try 9s9h against Jd9d in the calculator: the hands share no suit, and every card can be changed. The links after it are the closest matchups in the ranking.

How this was computed

The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 12 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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