Your partner makes an "impossible" bid, when it is not consistent with their previous bids. It often presents itself with an unnecessary jump in a suit, whereas the no-skip nomination is natural and should suit the situation. It can also take the form of an auction in a color that was previously denied. This bid, artificial in essence, will show an implicit fit and an important indication of the location of force or distribution.
Assistant Master and Federal Referee at the FFB, I have taught in France, Guadeloupe, the United States and now New Caledonia.
I participated in the Bridgeur experience for Zoom classes and I refined my teaching technique by multimedia documentation and in particular exercises taking advantage of the spaced repetition that will allow you to memorize your achievements.