Oscar Robertson has the lowest eFG% in a game with 10+ rebounds, 20+ points and 10+ assists, at 22.7 percent against the Baltimore Bullets on February 17, 1968.

what is the lowest efg% by a player in a game with 20 points, 10 rebounds and 10 assists
Interpreted as:
What is the lowest efg% by a player in a regular-season game with 20 or more points, 10 or more rebounds and 10 or more assists?

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