That should be MacLeod! Sor-ray! %H A086446 A. MacLeod, <a href="http://maths.paisley.ac.uk/allanm/ECRNT/knight/knintro.htm">The Knight's Problem</a> %H A086446 A. MacLeod, <a href="http://maths.paisley.ac.uk/allanm/ECRNT/Ecrnt.htm">Elliptic Curves</a> ralf