CREATE TABLE table_12941 ("White" CLOB, "Black" CLOB, "Year" FLOAT, "Result" CLOB, "Moves" FLOAT, "Tournament" CLOB, "Opening" CLOB)

Which year had e34 Nimzo-Indian defence is the opening?
SELECT "Year" FROM table_12941 WHERE "Opening" = 'e34 nimzo-indian defence'
SELECT "Year" FROM "table_12941" WHERE "Opening" = 'e34 nimzo-indian defence'