Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_9 (period VARCHAR, player VARCHAR)
### Question:
In which period did Stanislav Chistov get a penalty?
### Answer:
SELECT period FROM table_name_9 WHERE player = "stanislav chistov"