yechenwan

I just learn Frelling 2 bids 2 Diamond Opening Shape = 4+ Diamonds and 4+ cards in either major Could be 4432, but not 5440 or 4441 Restrictions = Requires at least Qxxx or any xxxxx in a major 2 Heart Opening Shape = (4+ Hearts and 4+ Spades) or (4+ Hearts and 5+ Clubs) Could be 4432, but not 5440 or 4441 Restrictions = Requires at least Qxxx or xxxxx in either major 2 Spade Opening Shape = 6+ Spades (6322, 6331, or 7222 shape) or 4+ Spades and 5+ Clubs (not 5440) Restrictions = Requires at least Qxxx or xxxxx Spades How to design a defensive bidding system against them? Thanks Ye Chenwan