[Retros] Restrictions on bishops' square-colors
afretro at yandex.ru
Tue May 22 13:34:33 EDT 2007
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.
More information about the Retros