The Key card Swiss convention
Here is the
non-frame based version of the Key card Swiss convention.
The Keycard swiss convention is a bid of four clubs or four diamomds directly over partner's
one heart or one spade opening. It promises four card support and is best played as 12-15 points.
The Key card swiss convention is best used in conjunction with the Jacoby 2NT convention,
with Jacoby 2NT promising 16+ points.