Verdediging tegen zwakke SA

http://bridgewinners.com/article/view/taming-the-weak-notrump-part-1/

http://bridgewinners.com/article/view/taming-the-weak-notrump-part-2/

http://www.bridgeguys.com/Conventions/no_trump_defense_methods.html

http://www.bridgeguys.com/Conventions/bergen_over_weak_nt_openings.html

http://www.bridgeguys.com/Conventions/MohanDefenseNT.html

http://www.larryco.com/BridgeArticles/ArticleDetails.aspx?articleID=556