Question: When they played San Lorenzo, what was the score of the second leg?
SQL: SELECT "2nd leg" FROM "1-17282875-3" WHERE "Team #1" = 'San Lorenzo';

Question: When they played Universidad de Chile, what was the score of the first leg?
SQL: SELECT COUNT("1st leg") FROM "1-17282875-3" WHERE "Team #2" = 'Universidad de Chile';

Question: Who played San Lorenzo?
SQL: SELECT "Team #2" FROM "1-17282875-3" WHERE "Team #1" = 'San Lorenzo';

Question: Who played River Plate?
SQL: SELECT "Team #2" FROM "1-17282875-3" WHERE "Team #1" = 'River Plate';