It seems the author likes to use variable names to encode messages: - "Biyubi" looks like his nickname (on his chess site [1] contact mail is "biyubi@gmail.com

It seems the author likes to use variable names to encode messages: - "Biyubi" looks like his nickname (on his chess site [1] contact mail is "biyubi@gmail.com") - there is also "o, S, C, A, R, T, G" which are his first name and surname initials - and already mentioned "X(c, h, e, s)" [1] http://nanochess.110mb.com/author.html http://nanochess.110mb.com/author.html