I'm not 100% on G10's but think you will find that there are a total of 19 movements + the final @ top of back swing.
They are close but not exactly the same ie:
19th movement = 95% power but 18th=89%, 17th=83% etc etc (example only)
Half way (10th movement) is definitely not half power!
Practice with whatever club/ball combination is the only way to be sure (never assume)