Question: Who's captain of the team whose stadium has a capacity of 17800 people?
SQL: SELECT "Team captain" FROM "1-23214833-1" WHERE "Capacity" = 17800.0;

Question: How many different team captains does the club Sliven 2000 have?
SQL: SELECT COUNT("Team captain") FROM "1-23214833-1" WHERE "Club" = 'Sliven 2000';

Question: Who's the captain of the team whose stadium is Gradski Stadion?
SQL: SELECT "Team captain" FROM "1-23214833-1" WHERE "Stadium" = 'Gradski Stadion';

Question: What stadium has capacity for 13800?
SQL: SELECT "Stadium" FROM "1-23214833-1" WHERE "Capacity" = 13800.0;

Question: How many people can attend games in the stadium of the team whose captain is Vasil Vasilev?
SQL: SELECT "Capacity" FROM "1-23214833-1" WHERE "Team captain" = 'Vasil Vasilev';