user: Question: What year had a 1st Round playoff in the NASL Indoor league?
Columns: ['Year', 'Division', 'League', 'Reg. Season', 'Playoffs', 'Open Cup']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['1974', '1', 'NASL', '1st, Western', 'Champions', 'Did not enter']
SQL:

assistant: SELECT "Year" FROM "Table" WHERE "Playoffs" = '1st Round' AND "League" = 'NASL Indoor';