Special Cue-bids

Stopper showing

• 1S-2D-Pass-2H-Pass-3C-Pass-3S: Asking for spade cooperation
• 2S-3D-Pass-3H-Pass-3S: Asking for spade stopper
• 1D-1H-2C-DBL(Snapdragon)-Pass-2H-2S: Spade stopper, no heart stopper
• 1D-1S-2C-Pass-3C-Pass-3H: Heart stopper, no spade stopper
• 1D-1S-2C-Pass-3C-Pass-3S: Spade stopper, no heart stopper

Check-back

• 1C-1X-1Y-Pass-1NT-Pass-2X: As 2C would be natural, 2X is the check-back
• 1X-1Y-1Z-Pass-2X-Pass-2Y: This is in lieu of 3rd suit forcing

Moderating

• 1X-1Y-1/2Z-Pass-2Y: As the Z bid is round forcing, opener may have no other bid if he does not have a stopper in Y…