Luckily for you, the hand already exists and is used to measure the height of horses.
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Make that difference is one of the fundamentals (see lessons in fundamentals, the book). You do it at your level, as you can, but having some idea if a place is sure capitalized or if you’ll have to share it, seems to me key to decide what to do.
The clearest definition of moyo I saw in the “Sector Fights” course by Bruce Wilcox.