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Rich,
The tournaments run by USA Baseball, Perfect Game, CABA, and other smaller entities like the Battle in the South all use NFHS as the basis for their rules.
USSSA and Nations baseball use OBR based rules with some of the NFHS safety rules.
Roughly speaking, at about age 14 (sometimes less) travel ball organizations which have players that will end up playing college ball pretty much stop playing in USSSA or Nations and play instead tournaments that use NFHS rules.
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