Many people have asked about the Killer Sudoku posted on September 27th.
I haven’t tried to solve this Killer by hand but it is very much possible that it requires either a lot of math (the technique that I call “cage/fence splitting”, which will be explained in the next few days) or that it cannot be solved by “logic” alone, that it needs trial and error. What is certain is that it does have only one solution.
Why did I post such a puzzle? Because as you might know, the first puzzle was published on September 26. At that time, the algorithm used for producing Killer Sudokus relied heavily on “backtracking”, or trial and error in plain words.
So, one of these days I will try to solve it by “logic” (I think this term is improperly used in this context) and if I succeed I will post a step-by-step solution. If not, maybe someone will and we will be very thankful if they post their solution :).
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