Who scored the winning goal in the 1979 -1981 fa cup final?

The 1972 Cup Winners' Cup final was between Rangers and Dynamo Moscow, Rangers won the game 3 - 2. The decisive third goal in the tie, which put Rangers 3 - 0 up in the match, was scored by Willie Johnston - two goals from Dynamo Moscow in the second half were not enough to turn the scoreline over.