jianying ji wrote on Sun, Jan 19, 2003 02:15 AM UTC:
by symmetrical square, Antoine means the square of the same rank,
but on a file as far from the farther edge as the original file
is from the closer edge.
So the symmetrical square of a square on y file is on the j file
similarly the following pairs of files correspond:
z-i
a-h
b-g
c-f
d-e
so jack first moves from its square to the corresponding square in the
corresponding file then moves as a firz or wazir depending on the
location of the kings.