  We modify the concept of quantum strategic game to make it useful for
extensive form games. We prove that our modification allows to consider the
normal representation of any finite extensive game using the fundamental
concepts of quantum information. The Selten's Horse game and the general form
of two-stage extensive game with perfect information are studied to illustrate
a potential application of our idea. In both examples we use
Eisert-Wilkens-Lewenstein approach as well as Marinatto-Weber approach to
quantization of games.
