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In a head-to-head situation, you're ahead after the flop, but are still an underdog if the hand shows down.
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AA vs. 15 out draw. The draw alone is 54%.
AA vs. flush draw + str8 draw 56.26%
13 outs is 48%, but an extra pair make this 58.59%:
AA vs. flush draw + gutshot + pair 58.59%
This draw is almost a 2-1 favorite:
AA vs. str8 flush draw + pair 64.65%
This one wouldn't be > 50% without the 3-str8:
AA vs. flush draw + 3-str8 + pair 52.53%
Here are some more with small pair vs. 1 or 2 bigger cards:
33 vs JTo + str8 draw 50.61% (33 has backdoor flush draw)
33 vs. JTs + flush draw 53.84% (33 has gut shot)
88 vs. A5s + flush draw + gut shot (1 over card) 54.74%