Counting strokes

Hi people,
I read an article in an old magazine of shorthand in Spanish, and it's mentioned that the X system uses 10% less of strokes than the Y system.
Does anyone know how to count strokes?
For example, in the picture I post:  you can see in that "mister" in Gregg and "neck" in Pitman, both use two strokes; but, what about "selection"? Could it be 3 strokes for Gregg, and 1 and 1/2 for Pitman?

(by valo1969 for everyone)