1§-1¨-1©-1ª = forcing not necessarily to game

1§-1¨-1©-2ª = values for 2NT with no ª stopper

Other 4th suit auctions forcing to game

1¨ -1© -1ª -3§ = to play weak 4-6

1§ -1©-1ª -3¨ = to play weak 4-6

 

2 special 4th suit auctions

            1© - 1ª - 2§ - 2¨ = puppet to 2© thus1© - 1ª - 2§ - 2© = 4th suit game forcing

            1¨ - 1© - 1ª - 2§ = puppet to 2¨ thus 1¨ - 1© - 1ª - 2¨= 4th suit game forcing

 

POLOWAN

1§-1¨-1©-1ª =

1§-1¨-1©-2ª =