Find the top left-hand corner of
an imaginary 3 by 1 rectangle
lying within the square by
creasing in part of one diagonal
and part of a three-quarter way
line. The point where they
intersect is the top left corner
of the rectangle.
Use the corner of this imaginary
3 x 1 rectangle as a location
point for this fold. When the
fold is flattened the crease must
pass exactly through corner z.
Use the point where the new
crease intersects the left hand
raw edge to locate the final
Cut along the new crease to
separate the mock platinum
rectangle from the square.