Fill the cells (big circles) of the grid with the numbers 1 though 9. On no straight line (with 2 - 9 cells) there can be any number repeated.

If there is between neighboured cells a line with a white dot, then the difference between the numbers in these cells is 1. If there is between neighboured cells a line with a black dot, then one number is the half from the other. The dot between two cells with 1 and 2 can have any of these two colors.

If there is a line without a small dot between two cells then neither the difference is 1 nor one cell is the half of the other.