Question: What is the total number of runners-up for a club with winning years of 2010?
SQL: SELECT COUNT("Runners-up") FROM "2-15726366-2" WHERE "Winning Years" = '2010';

Question: Who were the runners-up for the FC Viktoria Plzeň club?
SQL: SELECT "Runners-up" FROM "2-15726366-2" WHERE "Club" = 'FC Viktoria Plzeň';