Open Q8o pre, check flop, call the tiny turn lead, and comfortably fold river versus a big bet on a straight-completing board.
Flop 3s4c6c is very connected and favors BB’s defend range. Solver mixes between betting and checking here; with Q-high and a backdoor flush draw, checking is a solid, low-variance option that avoids getting blown off our equity by a check-raise.
Turn 2h is a low card that doesn’t really change our hand; BB now leads 1BB into 6.5BB. We’re getting about 7.5:1 and need only ~12% equity, so calling with Q-high and a backdoor flush draw is the standard play. Raising mostly isolates us against made hands and strong draws and doesn’t meaningfully fold out better hands.
Note: Raising the tiny turn lead with Q-high is overly ambitious; calling is the higher-EV option given the price and our equity.
River 7d completes the straight and BB bets 6.6BB into 21.1BB. Our Q-high has no showdown value and we don’t block any of the natural straights, so folding is correct despite the attractive price. Solver also prefers folding this combo here.