From 1950 to 1970, what is the maximum point of players whose teams were ranked 1?
from 1950 to 1970 refers to year between 1950 and 1970; team with rank 1 refers to rank = 1; maximum point refers to Max(points)
SELECT MAX(T2.points) FROM teams AS T1 INNER JOIN players_teams AS T2 ON T1.tmID = T2.tmID AND T1.year = T2.year WHERE T1.year BETWEEN 1950 AND 1970 AND T1.rank = 1