Enter move as just four digits (xy-to-xy) e.g. '4243'.
Add pieces by typing 'w' for white or 'b' for black
followed by 'q' for a queen, 'k' for a knight, 'r' for a rook
or 'b' for a bishop then followed by the xy as two digits
e.g. 'bk28' = Add a black knight at x = 2, y = 8.