CREATE TABLE "national_champions_of_chile" (
  "year" real,
  "city" text,
  "rider_1" text,
  "rider_2" text,
  "horse_1" text,
  "horse_2" text,
  "association" text
);

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

Question: Which horse was Horse 1 when rené guzmán raced with the mulchén association?
SQL: SELECT "horse_1" FROM "national_champions_of_chile" 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 "national_champions_of_chile" WHERE "city"='rancagua' AND "horse_1"='papayero';