I would open 2S on the South hand. In my experience it pays to get in the bidding if I own the Spades. Spades are the emperor of the suits,always keeping you one step ahead of the opposition. I would suggest this bidding sequence:- South North 2S 3C (forcing) 3D 4NT (Roman Keycard Blackwood for spades) 5D(1 or 4) 7S Pass Using simple Blackwood makes reaching the slam difficult as the trump King doesnt count in the 4NT bid which essentially asks for Aces alone.