Whats the row of symbols across the top of the screen that grows after each point?
That’s an audit trail, to show the previous points in each game. “O” means first serve point, “o” means 2nd serve point, “d” means double fault, “A” means first serve ace, “a” means 2nd serve ace. The symbol “v” means penalty point. The symbol goes on the line of the point winner; for example, in this example, BE/JS won the first three points of the game, and JB/CW won the next two.
