garyleung: Reply to dtiger:
I am not sure, but perhaps after capturing the F2 stone, the 4 stones in the center may not live.
caranthir: The (only) correct solution here is the one where opponent's D2 group (bottom left coordinates) are captured, so what dtiger suggested is unfortunately just not good enough.
Reply to dtiger: I am not sure, but perhaps after capturing the F2 stone, the 4 stones in the center may not live.