Table: estoril_matches
Columns: season
competition
round
opponent
home
away

Question: Which round has an opponent of Freiburg?
SQL: SELECT "round" FROM estoril_matches WHERE "opponent" = 'freiburg'

Question: Who was the home when the opponent was slovan liberec?
SQL: SELECT "home" FROM estoril_matches WHERE "opponent" = 'slovan liberec'