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

Question: Who was the opponent of Anand in the match with 20 moves that opened with E15 Queen's Indian Defence?
SQL: SELECT "black" FROM "advanced_chess" WHERE "white"='anand' AND "moves"=20 AND "opening"='e15 queen''s indian defence';