Without sight of a board, two players pass a game score back and forth, filling in the next move. Not exactly blindfold, because being able to see all the moves so far allows reconstructing the position.
Semi blindfold simul: the master sits in one place. The players shuttle back and forth to their boards carrying their own game scores. Boards may proceed at different speeds. Players might not even be required to treat their own board like a game; they can physically analyze on it if they wish.
Something fancier involving tablets to avoid illegal moves.
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