Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_12970 ( "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?

### Accurate SQL ###

SELECT "Black" FROM table_12970 WHERE "White" = 'anand' AND "Moves" = '20' AND "Opening" = 'e15 queen''s indian defence'