Tennis can be a particularly hard game when your opponent is more skilled than you.
Today’s invention is a net for a tennis court which can be moved a short distance from its normal, central position and locked in place so as to provide a larger area on the side of the better player. This makes it easier to return his shots, requires that his service be very accurate and allows the lesser player to cover less of the court.
Such an arrangement effectively handicaps the more accomplished player, in a quantifiable way, and thus allows people of differing ability to enjoy a challenging game together.