Answered May 2nd, 2019

The Philadelphia 76ers have won three games this playoffs by 20+ points, tying the 1982 and 1967 squads for most such wins in a postseason in franchise history.

When was the last time the 76ers had 3 playoff games with 20 MOV in a postseason?
Interpreted as:
When was the last time the 76ers had 3 or more playoff games with 20 or higher MOV in a postseason?