Negative Free Bids
After RHO overcalls partner's opening, a free bid shows a weak hand! To show a stronger hand, partner must double and then bid their suit.
Example:
part opp you
1C 1S 2H = 10 or less points with hearts
or
1H 1S 2D = 10 or less points with diamonds
or
1H 1S Double = negative double OR strong minor hand