CREATE TABLE table_19122 ("Club" TEXT, "Played" TEXT, "Won" TEXT, "Drawn" TEXT, "Lost" TEXT, "Points for" TEXT, "Points against" TEXT, "Tries for" TEXT, "Tries against" TEXT, "Try bonus" TEXT, "Losing bonus" TEXT, "Points" TEXT)

was the the score when the tries was 743
SELECT "Points against" FROM table_19122 WHERE "Points for" = '743'
SELECT "Points against" FROM "table_19122" WHERE "Points for" = '743'