Table schema:
CREATE TABLE table_name_64 (gold INTEGER, total VARCHAR, silver VARCHAR, bronze VARCHAR, type VARCHAR)

Question: What is the average gold of the winter athlete with 1 bronze, less than 3 silver, and less than 4 total medals?
SQL: SELECT AVG(gold) FROM table_name_64 WHERE bronze = 1 AND type = "winter" AND silver < 3 AND total < 4