A1: First man right-hand turn second woman. Left-hand turn partner, then cast, second man move up.
A2: Ones left-hand turn again. First woman right-hand turn second man, then cast, second woman move up.
B1: First man cast up the outside, first woman up the middle; man down the middle, woman cast down the outside. Ones two-hand turn.
B2: First man up the middle, first woman cast up the outside; man cast down the outside, woman move down the middle. Two-hand turn.
That's the original B1, but the fair-shares version is:
B2: Second man cast down the outside, woman down the middle; man up the middle, woman cast up the outside. Two-hand turn.