user: Question: What is the lowest Points when against is 50, and there are less than 20 played?
Columns: ['Position', 'Team', 'Points', 'Played', 'Drawn', 'Lost', 'Against', 'Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: [1.0, 'Palmeiras', 32.0, 20.0, 2.0, 3.0, 19.0, '31']
SQL:

assistant: SELECT MIN("Points") FROM "Table" WHERE "Against" = 50.0 AND "Played" < 20.0;