Thanks, I might, eventually.

J. Poniachik, BTW, was a mathematician from Uruguay, very active in the field of Recreational Math, having published quite a few magazines and books about this during his life, and also created several puzzles and games that are know worldwide, for example, this one - https://en.wikipedia.org/wiki/Battleship_(puzzle)

About him: https://es.wikipedia.org/wiki/Jaime_Poniachik (also in Spanish - I don't think there is an entry for him in English)