K9s vs 97s: preflop equity

Over all 1,712,304 boards that can follow this deal, K9s finishes with 68.46% of the pot and 97s with 31.54%.

K9s

68.46%

Wins 66.92%, ties 3.09%

97s

31.54%

Wins 29.99%, ties 3.09%

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

K9s against 97s: the numbers

Exact preflop results for K9s against 97s, in percent
HandWinsTiesLosesEquity
K9s66.9213.08629.99368.464
97s29.9933.08666.92131.536

The matchup is suited hands on both sides, K9s against 97s. Because the hands share one rank, the one with the higher kicker is ahead when that rank pairs and the other hand is mostly drawing.

K9s is the clear favorite, though 97s gets there on roughly one board in 3. 3.09% of boards are ties, so the equity of each hand is its win rate plus half of that.

By strength against a random hand, K9s holds place 29 of 169 and 97s holds place 94.

Boards behind the percentages: 20,547,648 counted in all
HandBoards won, aboutBoards tied, aboutBoards lost, about
K9s13,751,000634,0006,163,000
97s6,163,000634,00013,751,000

The total is exact: 12 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand.

K9s against 97s read as odds
HandEquity as odds (to 1)Wins one deal inLoses one deal inPot odds needed to call (to 1)
K9s2.1711.4943.3340.461
97s0.4613.3341.4942.171

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

The flop changes the picture. K9s does best on rainbow flops topped by a ten or better, at 72.88%, and worst on low rainbow flops (nine high or lower), at 54.06%. K9s stays ahead on all five textures, but the swing between them is large, so how the flop looks matters a great deal.

K9s against 97s by flop texture, in percent
FlopShare of flopsK9s winsTies97s winsK9s equity
Rainbow, ten or higher25.25471.5722.62025.80872.882
Rainbow, nine or lower5.65452.2983.52044.18254.058
Two-tone46.54365.8212.50331.67667.072
Monotone5.21559.8744.85035.27662.299
Paired17.33469.9874.65925.35472.316

A rainbow flop shows three suits, a two-tone flop repeats one suit, a monotone flop is a single suit, and a paired flop repeats a rank.

Compared with a random hand

The table below sets each hand against its own random-hand baseline: a change of +8.47 points for K9s, from 59.99%, and -17.58 for 97s, from 49.12%.

K9s and 97s here compared with each against a random hand, in percent
CaseEquity hereAgainst a random handChange in pointsTimes the random-hand equity
K9s, all flops68.46459.988+8.4761.14129
K9s, rainbow, ten or higher72.88259.988+12.8941.21494
K9s, rainbow, nine or lower54.05859.988-5.9300.90115
K9s, two-tone67.07259.988+7.0841.11809
K9s, monotone62.29959.988+2.3111.03852
K9s, paired72.31659.988+12.3281.20551
97s, all flops31.53649.118-17.5820.64205
97s, rainbow, ten or higher27.11849.118-22.0000.55210
97s, rainbow, nine or lower45.94249.118-3.1760.93534
97s, two-tone32.92849.118-16.1900.67039
97s, monotone37.70149.118-11.4170.76756
97s, paired27.68449.118-21.4340.56362

Does a shared suit matter?

Suits do not split this matchup, because no legal deal has the hands holding the same suit.

K9s against 97s by suit overlap, in percent
DealsSpecific dealsShare of dealsK9s winsTies97s winsK9s equity
Share a suit00.00not possiblenot possiblenot possiblenot possible
No shared suit12100.0066.9213.08629.99368.464

How often this matchup comes up

Out of 1,624,350 ways to deal two seats two cards each, 12 are K9s in one seat and 97s in the other (0.0007%); with the seats swapped too, 24 (0.0015%).

A worked example

Worked example: both players commit $100, so $200 sits in the middle. Over every board, K9s' average share is $136.92 (a gain of $36.92) and 97s' is $63.08 (a loss of $36.92).

Scaled to 1,000 deals, that is roughly 669 wins for K9s, 300 for 97s and 31 chopped pots.

The same matchup from the other side

97s versus K9s is this same page seen from the other hand: 31.54% for 97s, 68.46% for K9s.

Open the calculator with Ks9s against 9h7h 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

The page is built from a full enumeration: 1,712,304 boards, every suit pattern of the 12 specific deals, both seven-card hands evaluated. A tie is worth half a win to each hand, and a board is tallied under each of its ten possible flops for the texture rows.

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

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