Question: What is Round 2 when Round 4 is Double and Round 3 is Single?
SQL: SELECT "Round 2" FROM "2-153689-2" WHERE "Round 4" = 'Double' AND "Round 3" = 'Single';

Question: What is Round 5 when Round 4 is Triple, Round 3 is Double and Round 6+ is Triple?
SQL: SELECT "Round 5" FROM "2-153689-2" WHERE "Round 4" = 'Triple' AND "Round 3" = 'Double' AND "Round 6+" = 'Triple';

Question: What is Round 1 from 1977 where Round 3 is Double and Round 4 is Double?
SQL: SELECT "Round 1" FROM "2-153689-2" WHERE "Round 4" = 'Double' AND "From" = 1977.0 AND "Round 3" = 'Double';

Question: What is Round 2 from 1999?
SQL: SELECT "Round 2" FROM "2-153689-2" WHERE "From" = 1999.0;

Question: What is Round 4 when Round 6+ is Triple, Round 5 is Triple and Round 3 is Single?
SQL: SELECT "Round 4" FROM "2-153689-2" WHERE "Round 6+" = 'Triple' AND "Round 5" = 'Triple' AND "Round 3" = 'Single';

Question: What is round 3 where From is earlier than 1990 and the Goal is 400?
SQL: SELECT "Round 3" FROM "2-153689-2" WHERE "From" < 1990.0 AND "Goal" = '400';