Rules: Checksum

As is the case for the Sudoku only numbers may be used from 1 to 9 with the Kakuro. No numbers may be used doubly. In the black filled out fields with a diagonal line it has a number. It applies now in the pertinent free fields the numbers in such a way too set that the checksum (addition of all numbers) is identical with this number. This must so often be repeated with all free fields to all fields is correctly filled out and the checksums with the defaults to agree. There only numbers between 1 and 9 to be used may do are given the highest number of 45 (1+2+3+4+5+6+7+8+9=45).