CREATE TABLE table_59929 ("White" TEXT, "Black" TEXT, "Year" FLOAT, "Result" TEXT, "Moves" FLOAT, "Tournament" TEXT, "Opening" TEXT)

What's the black with 24 moves in the dortmund tournament?
SELECT "Black" FROM table_59929 WHERE "Moves" = '24' AND "Tournament" = 'dortmund'
SELECT "Black" FROM "table_59929" WHERE "Moves" = '24' AND "Tournament" = 'dortmund'