user: Question: What is the average for matches with a prize money amount of £3,000?
Columns: ['Round', 'Date', 'Matches', 'Clubs', 'New entries this round', 'Prize money']
Types: ['text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Preliminary Round', '6 October 2007', 46.0, '258 → 212', '92', '£1,000']
SQL:

assistant: SELECT AVG("Matches") FROM "Table" WHERE "Prize money" = '£3,000';