JJ is a mandatory UTG open; flop check is standard, and the turn pot bet on the paired board is a solid mix between value and protection.
Flop 8d 2d Tc, pot 14.5BB, SPR ~8. BU has position and a slight range advantage, and JJ is an overpair but not a nutted one. Solver prefers a lot of checking here with JJ, mixing in some small bets. Checking keeps our range protected and avoids getting blown off our equity by a check-raise. BU’s range is still wide and contains plenty of Tx/8x and diamond draws, so checking and letting them act is a solid, low-variance choice.
Turn pairs the 2, which is generally good for our overpair and bad for BU’s Tx/8x and diamond draws. Solver likes a polarized strategy here: a lot of checking, some small bets, and a chunk of overbets. Our 100% pot bet lands in the middle of that strategy and works well as a value/protection bet versus Tx/8x and diamond draws, while still allowing some checking to keep our range balanced. BU folds, which is a reasonable outcome given the strength of our hand relative to their range.