1§-1¨-1©-1ª =  not game force

1§-1¨-1©-2ª =  game force with ♠

 

Other 4th suit auctions forcing to game

 

1¨ -1© -1ª -3§ = to play weak 4-6 (see special 4th suit auctions)

1© - 1ª - 2§ - 3♦ = weak 4-6 (see special 4th suit auctions)

1§ -1©-1ª -3¨ = forcing

 

2 special 4th suit auctions

 

1© - 1ª - 2§ - 2© = 4th suit game forcing (not slammish in majors)

 

1© - 1ª - 2§ - 2¨ = puppet to 2© (starts all invitational sequences) then

            2♠ = 6 card suit HCP to accept 3NT

            2NT = natural 5 card ♠ suit

            3♣ = natural

            3♦ = natural

            3♥ = playable only in ♥

            3♠ = playable only in ♠

1© - 1ª - 2§ - 2NT invitational no 5 card suit

1© - 1ª - 2§ - 3 = courtesy raise

1© - 1ª - 2§ - 3♦ = weak 4-6

1© - 1ª - 2§ - 3 = slammish

1© - 1ª - 2§ - 3♠ = slammish

 

 

 

             

1¨ - 1© - 1ª - 2¨= 4th suit game forcing (not slammish except in ♣)

 

1¨ - 1© - 1ª - 2§ = puppet to 2¨ starting all invitational sequences

            2♥ = invite with 6 card suit with HCP to accept 3NT

            2♠ = natural with HCP to accept 3NT

2NT (invitational with 5 card suit)

3 = natural

3♦ = natural

3 = playable only in

3 = playable only in

 

                       

1¨ - 1© - 1ª - 2NT (invitational no 5 card suit)

 

1¨ - 1© -1ª -3§ = to play weak 4-6

 

1¨ - 1© - 1ª - 3♦,  = slammish

1¨ - 1© - 1ª - 3♥ = slammish

1¨ - 1© - 1ª - 3 = slammish