Normal fillomino rules apply ie Divide the grid into regions of orthogonally-connected cells. Fill each cell with a number equal to its region’s size (ie the number of cells in its region). No two regions of the same size can share an edge (although they may touch diagonally). Use only region sizes of 1 to 9 and the digit N cannot appear in row N or column N. Two digits separated by a black dot must be in a 1:2 ratio (ie one digit should be double the other). Cells separated by a single knight's move (in chess) cannot contain the same digit.