Welcome on this forum
pmin00 wrote:I'm trying to find the hardest existing Kakuro puzzle, no luck so far.
In Kakuro, there's no standard or pseudo-standard way of measuring hardness - contrary to Sudoku, where SER is a more or less accepted rating, in spite of its many shortcomings (the main reason IMO is, it's the only available free rating !!).
Contrary to Sudoku again, the grid can have any size. It's obvious that, in the mean
, a large Kakuro will be harder than a small one. But this also depends on the relative density of white cells and on their topology. And a small sized one can be much harder than a large sized one.
Moreover, contrary to Sudoku also, there has never been any systematic search for the "hardest" Kakuro (in any meaning of the word), even for fixed grid size.
The hardest ones I've found are on atksolutions.com, most of them 14x14.
I use my own rating system, based on whips and braids (meaningful for any Constraint Satisfaction Problem and therefore for many logic puzzles).
The display is awful, but it seems rather easy, using lots of surface sums.
BTW, all the crazy_dad I've tried were very easy.
If the puzzles are not available, no chance we can check them.
In any case, commercial books don't sell hard puzzles. They sell puzzles normal people can solve without getting headaches.
[Edit: see Smythe_Dakota evaluation of varied websites here: http://forum.enjoysudoku.com/kakuro-references-t31059.html