How a nine-gun battleship could fire alternating half-salvos

How would half-salvos work with three triple-gun turrets?

The ship could alternate five- and four-gun groups by firing selected barrels in each turret and then the complementary set.

An odd number of main guns does not prevent a battleship from using alternating ranging salvos. The ship could fire five guns and then four. One pattern would use the outer guns of the forward turrets and the center gun of the after turret, followed by the complementary barrels. The method preserves alternating fall-of-shot groups without requiring every turret to fire all three guns together.