CREATE TABLE table_77633 ("YEAR" FLOAT, "Seniors" TEXT, "Reserves" TEXT, "Thirds  ( Under 17's ) " TEXT, "Fourths  ( Under 14's ) " TEXT)

Which Thirds (Under 17's) have a Reserve of barnawartha?
SELECT "Thirds (Under 17's)" FROM table_77633 WHERE "Reserves" = 'barnawartha'
SELECT "Thirds (Under 17's)" FROM "table_77633" WHERE "Reserves" = 'barnawartha'