Question: How many matches played are associated with 20 losses?
SQL: SELECT "Played" FROM "2-12886178-6" WHERE "Lost" = '20';

Question: How many matches have Rhymney RFC played?
SQL: SELECT "Played" FROM "2-12886178-6" WHERE "Club" = 'Rhymney RFC';

Question: How many losses does Abercarn RFC have?
SQL: SELECT "Lost" FROM "2-12886178-6" WHERE "Club" = 'Abercarn RFC';