 A gifted scorer , Orr revolutionized defencemen 's impact on the offensive side of the game , as blue @-@ liners began to be judged on how well they created goals in addition to how well they prevented them . Orr scored the Stanley @-@ Cup @-@ winning goal in overtime of the fourth game against the Blues in 1970 , which gave the Bruins their first championship in 29 years . The goal was highlighted by his famous flight through the air after being tripped up following his shot . Orr twice won the Art Ross Trophy as the NHL 's leading scorer , still the only defenceman in NHL history to do so . His plus / minus of + 124 in 1970 – 71 is a league record . Orr signed a five @-@ year contract that paid him $ 200 @,@ 000 per season in 1971 , the first $ 1 million contract in league history . 
