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