66 vs 55
Preflop odds, heads-up Texas Hold'em
66
6♠6♥
80.7%
55
5♦5♣
19.3%
66 is the favorite: it wins about 80.7% of the time against 55 when both hands go to showdown, with ties 1.9% of runouts.
Computed from 400k simulated deals with the hands shown above.
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