Table: chelsea_1970_71_matches
Columns: date
round
opponent
venue
result
attendance

Question: What is the total attendance with a 1-0 result, at Venue H, and Round SF?
SQL: SELECT SUM("attendance") FROM chelsea_1970_71_matches WHERE "result" = '1-0' AND "venue" = 'h' AND "round" = 'sf'

Question: What is the lowest attendance at Venue H in Round R2?
SQL: SELECT MIN("attendance") FROM chelsea_1970_71_matches WHERE "venue" = 'h' AND "round" = 'r2'

Question: What is the highest attendance for the opponents Club Brugge in Venue A?
SQL: SELECT MAX("attendance") FROM chelsea_1970_71_matches WHERE "opponent" = 'club brugge' AND "venue" = 'a'

Question: What is the round for the opponent CSKA Sofia in Venue A?
SQL: SELECT "round" FROM chelsea_1970_71_matches WHERE "opponent" = 'cska sofia' AND "venue" = 'a'