Standard rules:
Place the digits 1-8 in every row, column and region.
White dots separate consecutive digits.
Additionally:
Place 8 chess knights in 8 cells of the grid. Knight cells may not share a row, column, region or digit.
The digit in a knight's cell gives the number of unoccupied (non-knight) cells the knight can reach in 1 move.
The digit in a knight's cell may not repeat in any cell a knight's move away.
Solution code: Row 4 followed by row 8. (16 digits, no spaces)