[Retros] Restrictions on bishops' square-colors

afretro afretro at yandex.ru
Tue May 22 13:34:33 EDT 2007

Dear Franco,
The idea of impossibility of certain combinations of bishops▓ square-colors was used, with the purpose of determining types of pieces coded by letters, by Kornilov and myself in so-called retro rebuses more than 20 years ago.
Andrey Frolkin

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