CREATE TABLE "blitz" (
  "white" text,
  "black" text,
  "year" real,
  "result" text,
  "moves" real,
  "tournament" text,
  "opening" text
);

Question: Which year had e34 Nimzo-Indian defence is the opening?
SQL: SELECT "year" FROM "blitz" WHERE "opening"='e34 nimzo-indian defence';