Leiber, Fritz. "Destiny Times Three"
Summary: In the future, someone gets a "probability machine" that lets him make real all the possible outcomes from various choices.
Published: In Astounding, March 1945; Five Science Fiction Novels (ed. Martin Greenberg), Gnome 1952 and Binary Star #1 (ed. Robert Silverberg), Dell 1978 (0440105641).
Original in: English.
Translation: German by Fredy Koepsell as Schicksal mal drei, Bastei-Lübbe 1981 (3404230019).