Between 1930 and 1936 , up to three assists could be awarded on a single goal .
Since passing between zones ( divided by the blue lines ) was illegal , all three passes had to be in the attacking end .
Between 1930 and 1936 , up to three assists could be awarded on a single goal , but since passing between zones ( divided by the blue lines ) was illegal , all three passes had to be in the attacking end .