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_71 (stage VARCHAR, mountains_classification VARCHAR, winner VARCHAR)
### Question:
What was the Stage when Pascal Richard had the Mountains classification and Vladimir Poulnikov won?
### Answer:
SELECT stage FROM table_name_71 WHERE mountains_classification = "pascal richard" AND winner = "vladimir poulnikov"