I can hear the complaints already, "Larry- How dumb do you think we are? We've been counting since... a lot of years ago."
I know counting sounds simple, but it's the cornerstone of good bridge. Experts are constantly counting: points, cards played in each suit, cards left in each suit per hand. When experts know exactly what's left in each hand, it isn't a magic trick. It's the result of counting.
The first place we usually start counting other hands is by counting trum