CREATE TABLE table_17968229_1 (home__2nd_leg_ VARCHAR2)

For home of River Plate, what is the first leg listed?
SELECT 1 AS st_leg FROM table_17968229_1 WHERE home__2nd_leg_ = "River Plate"
SELECT 1 AS "st_leg" FROM "table_17968229_1" WHERE "River Plate" = "home__2nd_leg_"