Checkback

The only way for advancer to make a game-forcing bid is to go through the Checkback at 2C. Opener – in his responses to the Checkback – gives priority to the hearts.

Opener’s responses

• 1C-1D-1NT-2C
• 2D: No 4-card major suit
• 2H/S: 4-card suit
• 2NT: 4 cards in both major suits
• 1C/D-1H-1NT-2C
• 2H: 3 cards in hearts
• 2D: otherwise
• 1C/D-1S-1NT-2C
• 2H: 4 cards in hearts
• 2S: 3 cards in spades and 3 or fewer hearts
• 2D: otherwise
• 1C/D-1D/H/S-2NT-3C or 1H-1NT-2NT-3C (Wolf Sign off)
• 3D: Relay
• 1C/D-1H-2NT-3D
• 3H: 3 cards in hearts
• 3S: 4 cards in spades and 2 or fewer hearts
• 3NT: otherwise
• 1C/D-1S-2NT-3D
• 3H: 4 cards in hearts
• 3S: 3 cards in spades and 3 or fewer hearts
• 3NT: otherwise

Advancer’s 3^rd bid

• The sign off
• 1C/D-1H/S-1NT-2C-2D/H-2H/S
• 1C/D-1S-1NT-2C-2H/S-pass
• 1C/D-1D/H/S-2NT-3C-3D-pass
• 1C/D-1H-2NT-3C-3D-3H
• 1C/D-1S-2NT-3C-3D-3H/S
• The invitation to game
• 1C/D-1H/S-1NT-2C-2D/H/S-2NT
• 1C/D-1H/S-1NT-2C-2H/S-3H/S
• The 2NT relay after 1C-1D-1NT-2C-2D/H/S. The responses are:
• 3C: 3 cards in diamonds
• 3D: 4 cards or 3 cards with a top honor in diamonds
• 3H/S: 2 cards with a top honor in diamonds and values in hearts/spades
• 3NT: Otherwise
• The 3C Ping-pong. It obliges opener to bid 3D and makes the next bid of the Advancer forcing. Here are the possible sequences:
• 1C/D-1S-1NT-2C-2H/S-3C
• 1C/D-1H-1NT-2C-2H-3C
• 1C/D-1D/H/S-2NT-3C-3D-3NT: Mild slam invitation with 5+ clubs
• 1D-1H/S-2NT-3C-3D-4D: Mild slam invitation with 5+ diamonds and 4 hearts/spades
• 4NT: Quantitative. To ask for Aces Advancer must first make a cue-bid.
• Any other bid is GF except 1m-1S-1NT-2C-2D-2H which is RF