user: Question: What is the Points against for the Ystradgynlais RFC club?
Columns: ['Club', 'Played', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Club', 'Played', 'Drawn', 'Lost', 'Points for', 'Points against', 'Tries for', 'Tries against', 'Try bonus']
SQL:

assistant: SELECT "Points against" FROM "Table" WHERE "Club" = 'Ystradgynlais RFC';