What's the black with 24 moves in the dortmund tournament?
CREATE TABLE "classical_games" (
  "white" text,
  "black" text,
  "year" real,
  "result" text,
  "moves" real,
  "tournament" text,
  "opening" text
);
SELECT "black" FROM "classical_games" WHERE "moves"=24 AND "tournament"='dortmund';