im slightly confused

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Avatar of DrawMaster

FIDE is THE International rating organization. The others are typically national federation rating bodies.

Avatar of bigpoison

You want to be a member of USCF if you want to play in tournaments in the U.S.

Avatar of ploboo

Pick the one where you have to pay a little more, but you're able to tell them what your rating is. For example the NKCF.