Table: rodeo_championship
Columns: year
city
rider_1
rider_2
horse_1
horse_2
association

Question: With which association did estribillo ii run as Horse 1?
SQL: SELECT "association" FROM rodeo_championship WHERE "horse_1" = 'estribillo ii'

Question: Which horse was Horse 1 when rené guzmán raced with the mulchén association?
SQL: SELECT "horse_1" FROM rodeo_championship WHERE "rider_1" = 'rené guzmán' AND "association" = 'mulchén'

Question: Who was the second rider when papayero raced as Horse 1 in the city of rancagua?
SQL: SELECT "rider_2" FROM rodeo_championship WHERE "city" = 'rancagua' AND "horse_1" = 'papayero'