CREATE TABLE table_204_450 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "event" TEXT, "notes" TEXT)

what was the name of the competition listed before the boston marathon in 1984 ?
SELECT "competition" FROM table_204_450 WHERE id = (SELECT id FROM table_204_450 WHERE "competition" = 'boston marathon') - 1
SELECT "competition" FROM "table_204_450" WHERE "id" = (SELECT "id" FROM "table_204_450" WHERE "competition" = 'boston marathon') - 1