Yes, it's necessary for more than 2/3 of the pairs in the field to be members. In the case of a two-winner movement, the two lines are considered separately for this purpose. That means that if you are close to the limit, it might be worth checking which direction your visiting pairs are sitting: if you have an 8-table two-winner game with three pairs of guests, you need them to be divided 1-2 between the two lines, otherwise the line they are playing in won't be graded..
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Yes, it's necessary for more than 2/3 of the pairs in the field to be members. In the case of a two-winner movement, the two lines are considered separately for this purpose. That means that if you are close to the limit, it might be worth checking which direction your visiting pairs are sitting: if you have an 8-table two-winner game with three pairs of guests, you need them to be divided 1-2 between the two lines, otherwise the line they are playing in won't be graded..