CREATE TABLE table_name_22 (race_name VARCHAR, dist__miles_ VARCHAR, runner_up VARCHAR)

Which race had a distance of 4 miles where the runner-up was not known?
SELECT race_name FROM table_name_22 WHERE dist__miles_ = "4" AND runner_up = "not known"
SELECT "race_name" FROM "table_name_22" WHERE "4" = "dist__miles_" AND "not known" = "runner_up"