CREATE TABLE table_56147 ("Team 1" TEXT, "Agg." TEXT, "Team 2" TEXT, "1st leg" TEXT, "2nd leg" TEXT)

What is the 1st leg when team 1 is Chelsea?
SELECT "1st leg" FROM table_56147 WHERE "Team 1" = 'chelsea'
SELECT "1st leg" FROM "table_56147" WHERE "Team 1" = 'chelsea'