Weak NTs are defined as point ranges less than 14-16. 2§ = TO for majors 2¨ = major one suiter 2M = Major and minor

When we double, if responder runs to a suit then double by advancer is TO. Pass by advancer is forcing and double by opener is TO.

POLOWAN

If we double a wk NT it creates a force through 2©

Advancers double is TO

Doubles of stayman and transfers are card showing