Roughly 1% Chance of Two Players Flopping a Set
Q: What Are The Odds Of a Set-Over-Set In Hold'em?
A: It's the setup in Hold'em that every player dreams of.
You are holding a pair in your hand and flop a set, which is a very strong hand in Hold'em.

Of course, the flip side of this is hitting a set yourself, only to find that your opponent has flopped a better set. This is an absolute gut punch and happens to every poker player.
The question is: what are the odds of a set-over-set situation occurring at a Hold'em table?
The odds of flopping a set when holding a pocket pair is approximately 12%.
The odds of flopping a set when holding a pocket pair AND somebody else flopping a set while holding a pocket pair is roughly 1% (the actual number is a bit over 1%).
So if you feel are though you took a really bad beat after losing in a set-over-set situation, you most certainly did, as you had a 1% chance of losing in that fashion when you were dealt your pocket pair.
Note: the 1% likelihood of a set-over-set situation only applies when you are dealt a pocket pair.
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