U1 watches the tag; if the play goes to 2nd, U3 has that play. U1 watches everything that happens at 1st, U3 watches everything that happens at 2nd. PU (if needed) rotates to 3rd, U1 then rotates home.
Just one umpire at 2nd.
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Steve
ASA/ISF/NCAA/NFHS/PGF
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