user: Question: What is the total number of Matches, when Clubs is 588 → 406?
Columns: ['Round', 'Date', 'Matches', 'Clubs', 'Prize money']
Types: ['text', 'text', 'real', 'text', 'text']
Sample row: ['Extra Preliminary Round', '28 August 2004', 73.0, '661 → 588', '£500']
SQL:

assistant: SELECT SUM("Matches") FROM "Table" WHERE "Clubs" = '588 → 406';