“Doubutsu Shogi” is a board game invented in 2008 by a professional shogi player Madoka Kitao. Although “Doubutsu shogi” is similar with shogi, its rule is far simpler than that of shogi. Since “Doubutsu shogi” is a two-player zero-sum game with perfect information, it is possible to determine theoretical values (Win, Lose, Draw) of all positions. In this article, we computed theoretical values of all positions reachable from the initial position, by means of making a program based on retrograde analysis. As a consequence, we confirmed that the theoretical value of the initial position is win by white( the second player ) with 78 moves. We also obtained some interesting results such that there are positions in which ”dropping a hiyoko piece on the promote zone” is the only winning move.
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