Yu Ren Dong wrote on Sat, May 26, 2012 08:34 AM UTC:
I think this only piece "ä¿¥" was made in Song Dynasty.
For my knowledge, each players' Rook of Chinese Chess was both written
as "車" (not "俥") in early Northern Song Dynasty. Red player Rook
was written as "ä¿¥" in Southern Song Dynasty in order to distinguish
each player's pieces on single-color printing book.