CREATE TABLE "first_knockout_round" (
  "team_1" text,
  "agg" text,
  "team_2" text,
  "1st_leg" text,
  "2nd_leg" text
);

Question: What is the 1st leg when team 1 is Chelsea?
SQL: SELECT "1st_leg" FROM "first_knockout_round" WHERE "team_1"='chelsea';