This problem is from 秘伝問題集 (Hiden Mondaishū, or Secret Problem Collection) by Hon dōjō, whose students include Fujisawa Rina 4p, Ichiriki Ryō 8p, and Shibano Toramaru 9p. The creators of the collection most likely had Igo Hatsuyō-Ron as their model, what with its originally having been a secret of the Inoue school, but having Mynavi openly publish the collection in spite of the title seems a bit strange.
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