Kakuro strategy: difference of multiple cells
In previous post on Kakuro series, I showed how a simple difference of 2 cells can break through a seemingly difficult opening. Now I’m going to show a similar but more advanced version: difference of multiple cells.
Kakuro initial layout
In this layout it is impossible to get difference of exactly 2 cells, as the opening is not exactly symmetric. Nonetheless the same strategy can be employed, see below.
Difference of multiple cells
That’s it. The difference we get this time is:
A+B+C-D = 48-27 = 21
Is that enough? No. But we still have another piece of useful information: C ≤ 5 (Why?)
Even with largest possible value of C (=5), A+B+C ≤ 22. That forces to a single solution, C=5 and D=1. (While A+B=17, one of them is 8 and another is 9)