user: Question: what is the total number of playoffs where regular season is 6th, Southwest
Columns: ['Year', 'Division', 'League', 'Regular Season', 'Playoffs', 'Open Cup']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [2003.0, 4.0, 'USL PDL', '4th, Southwest', 'Did not qualify', 'Did not qualify']
SQL:

assistant: SELECT COUNT("Playoffs") FROM "Table" WHERE "Regular Season" = '6th, Southwest';