kuokkamies: Imo Q2 should be accepted as correct answer too. Depending on outside defender might play N2 so Q2O1R2 is forced and gives ponnuki
Sadaharu: With the B3B2 exchange, D2 is generally not a good move as it gives white more eye shape. White also won't play G2 because the B2 move is wasted.
Imo Q2 should be accepted as correct answer too. Depending on outside defender might play N2 so Q2 O1 R2 is forced and gives ponnuki