Yu Ren Dong wrote on Sat, Oct 1, 2011 03:24 AM UTC:
In Changgi Association Tokyo Branch Rules, A Pawn must promote on reaching the 10th rank. A Pawn can promote only to a friendly piece (except for Guards
) that has been captured, and for which it is exchanged.
Please See
http://www.h2.dion.ne.jp/~janggi/tokyo%20new%20local%20rule.html