First, great puzzle, took me a good minute!

Second, I believe if I put a white piece on F3 then black piece would be forced to go on F4, then I put a white piece on C3 then black piece would be forced to go on D4, then I would put a white piece on D3 leaving both B3 and G3 open to take for the win and the enemy with only one piece. (If this is too confusing I can reword)