Regardless of what sadistic impulses we may harbor, winning bridge means helping partner avoid mistakes.
The difference between genius and stupidity at the bridge table is that genius has its limits.
A player who can't defend accurately should try to become declarer (or dummy).
Two guys play duplicate in the afternoon, go to a restaurant for dinner and discuss all the hands writing all over the tablecloth and napkins. They go back and play in the evening and return to the same restaurant and start going over the hands again. Finally Jim says: "Bill, don't we know anything but bridge? Can't we discuss something else, anything else, movies, politics sports, sex? "Sex, says Bill, I had sex diamonds to the king-queen.."