John Lawson wrote on Sun, Oct 5, 2008 12:46 PM UTC:
According to 'Superchess and Monarch: The Laws', section 10.3, 'A
castling is a move of (i) a King or Emperor and exclusively (ii) a Rook of
the same colour...' There's more about how it's done on a 10-file
board, but otherwise it's normal castling.
As part of his entire Superchess 'system', Henk van Haeringen defines 50 different piece types, so it would be impossible to define single letter abreviations for all of them, and stick with the Roman alphabet.
