The reason, I guess, is that if it were not so, the King could position itself next to the centre square and never be captured, even if it couldn't escape that way as the requirement is to place pieces on all 4 sides.
(peida) Kas tahad mängida palju erinevaid mänge, aga ei suuda otsustada, millest alata? Liitu juhuslike mängude turniiriga! (pauloaguia) (näita kõiki vihjeid)