California alongside his team, led the San Francisco Warriors to a Western Conference championship, but again failed to conquer the Celtics. The following season, he returned to the Eastern Conference to join the Philadelphia 76ers, who were the former Syracuse Nationals that had relocated to the city to cover the vacancy created with the departure of the Warriors. The first clash between the two stars in the playoffs was in 1966, with Boston winning the series 4–1. In the following season, Philadelphia coach Alex Hannum instructed Chamberlain to provide an increased focus on playing a team game, to avoid drawing the double-teams that troubled Chamberlain during the Finals. This tactical change brought the team to a new record of 68 wins the following season, as well as defeating the Celtics before winning the 1967 Finals. In 1968, Boston overcame a 3–1 deficit against Philadelphia to once again arrive in the Finals. They went on to defeat the Los Angeles Lakers in the Finals to again become NBA champions. In 1969, the Celtics faced great difficulty entering the postseason, as they had an aging team and multiple injuries to a number of players. They qualified for the playoffs as the fourth and final seed in the East, while the Lakers, who had added Chamberlain in the off-season to join stars Jerry West and Elgin Baylor, won the West and were prohibitive favorites to become champions for the first time since relocating to Los Angeles. Despite holding a 2–1 advantage going into Game 4, the Lakers led 87–86 and had the ball with 10 seconds to play. But after a turnover, Sam Jones scored to give the Celtics a narrow 88–87 win and tying the series. The series was eventually tied 3–3 going into Game 7 in Los Angeles, with Lakers owner Jack Cooke hanging balloons in the arena in anticipation of a Lakers victory. West also picked up injuries to his thigh and hamstring during the series, but returned to play for the final game. Russell utilized this newly lacking mobility in West to organize fast breaks at every opportunity for the Celtics, which allowed them to gain an early lead. They held off a furious Lakers comeback to win 108–106 and win the series, and win their eleventh championship in 13 years. As many stars either declined or retired following this win, it is largely recognized as the last NBA