jianying ji wrote on Sun, Jan 19, 2003 03:55 AM UTC:
by stacks I mean that one imagines the board to be three dimmensional
so moving a piece is equavalent to moving a piece in each level at the
same time.
so say A5 contains a combination barc-ferz-wazir, the it is represented
as barc at I-A5, ferz at II-A5 and wazir on III-A5. When it moves all 3
pieces move.