Getty Brad Stevens The Boston Celtics have won a record 18 NBA championships , the most successful franchise in the league’s history, and in fact they are the reigning NBA champions, winning banner 18 just last season. But the Celtics’ long-term success has not been an accident. Those titles, won over an eight-decade span, were built on the back of a long series of stunning and incredibly skillful trades and other personnel moves. Those moves started in 1956 when the team’s coach and general

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