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_81 (year VARCHAR, opening VARCHAR)
### Question:
Which year had e34 Nimzo-Indian defence is the opening?
### Answer:
SELECT year FROM table_name_81 WHERE opening = "e34 nimzo-indian defence"