99 vs 66
Preflop odds, heads-up Texas Hold'em
99
9♠9♥
80.5%
66
6♦6♣
19.5%
99 is the favorite: it wins about 80.5% of the time against 66 when both hands go to showdown, with ties 0.6% of runouts.
Computed from 400k simulated deals with the hands shown above.
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