NickRW, on 2014-June-30, 02:41, said:
In the 8 table for 27 boards case, you have 10 sets of 3 boards. Relay between 8 and 1, and between 4 and 5. It plays for 9 rounds without problems. It isn't much use for 7.5 tables as one pair would sit out twice.
You can get around this by making the NS pair who would sit out for the second time play one of their adjacent NS pairs instead on the final round - as long as you aren't trying to run it as a two-winner movement.