Set mining

Calling with a small pair to flop a set

Definition

Set mining means calling a preflop raise with a small or medium pair (22-88) for the sole purpose of flopping three of a kind — a set — and winning a very big pot against a strong opposing hand. The pair itself is rarely playable after the flop: the plan rests entirely on the ~12% chance of flopping the set (or better). Profitability follows implied-odds arithmetic: hitting your set happens about one time in 8.5, and you still need to get paid. The usual rule requires the effective stack to be at least ~15 times the call amount (the cautious say 20). At 100bb, calling 3bb with 4♠4♦ is standard; at 30bb effective the same call is burned money in advance — there isn't enough to win to finance all the times the flop misses. Two conditions sharply improve the yield: a strong opposing range (a tight UTG open will pay off with its overpair far more willingly than a wide BTN open) and closing the action (no risk of a re-raise behind). Beware the set trap on coordinated boards: set over set is vanishingly rare, but set against flush or straight is a reality that demands fastplaying.