Defend K9o vs SB’s 4x open, mostly check flop, and consider a small turn semi-bluff with the gutshot; river check is fine.
Flop Qc-7h-8d is semi-wet and SB has more overpairs, but we still have a range advantage. With K9o high and no real draw, checking is the go-to line; solver also mixes in a small 30% pot bet with this combo, but checking is very reasonable.
Turn 5h brings a gutshot to 9-6-5 and improves our equity. Solver prefers a small bet around one-third pot with this combo as a semi-bluff, but checking is still acceptable and keeps our range protected. We don’t want to over-bet into SB’s range advantage here.
Note: Turn is a good spot to take a small semi-bluff with the gutshot; checking is okay but slightly lower EV.
River Ah is very favorable to SB’s range, so we should check and let them bluff. Checking river is standard; we don’t have a strong enough hand to value-bet and we don’t want to fold out their bluffing region.