Shanghai can also be played for 20 rounds to use all numbers. A Fairer Start for Shanghai: To prevent players from becoming too practised at shooting for the 1, the number sequence can begin at the number of the dart that lost the throw for the bullseye to determine the starting thrower. For example; Thrower A shoots for the bullseye and hits the 17. Thrower B shoots for the bullseye and hits it. Thrower B then begins the game, starting on the number 17, then 18, 19, 20, 1, 2, 3, etc. through 16 (if no player hits Shanghai).