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A theory of corporate strategy has its own concept and propositions as a scientific theory. Theory of strategy has two kinds of difficulties with strategic propositions. Since the difficulties are not explicit, it had been almost impossible for us to resolve them. One kind of difficult thing is to prove a proposition. The other is ambiguity in interpreting and applying propositions. This situation should be remedied. In this paper, we propose how human games can be used as cases so that we can refute strategic propositions by one of the cases. In doing so, we show that the interpretations of a proposition will be extended, and then, business managers could get meaningful guideline for action from strategic propositions.