Possible values, then no other cell in that region can contain any of If there are kĬells contained entirely in a region that contain exactly k different Rule of K The Rule-of-k is an extension of the Rule-of-1. If S is the sum of all the cages containedĮntirely in a region, then the cells not covered must
Thus, each sudoku region has a total value Rule of 45 Each sudoku region (i.e., row, column, or nonet) contains theĭigits one through nine. Thus, if all the digitsīut one appear in a row, the missing digit must appear in the empty In the former case, each region must containĪll the digits one to nine. Rule of Necessity This rule can be applied to sudoku regions (i.e., row, column, or Likewise, each digitĬan appear in a cage only once. Row, it cannot be in any other cell in the row. In a sudoku region each digit appearsĮxactly once. No region canĬontain any duplicate digits. Rule of 1 This comes directly from the definition of sudoku. The following are the basic rules used to solve killer sudokus. (The Terminology used on this page is defined on the rules page.) At a later date we will post more complex We outline the basic strategies and then show how they are applied inĪ sample puzzle. The third is to consider the total value of a region. The second is to consider the different ways that a sum can beĬreated. The first is to use the strategies for solving regular sudoku puzzles. There are three basic methods used to solving killer sudoku puzzles. More advanced example based on weekly 183 Killer Sudoku Solving Strategies.A daily (#1271) is easier than it looks.More advanced example based on weekly 74.More advanced example based on weekly 28.More advanced example based on weekly 24.It’s not a panacea like Tabling or Nishio but it is easier to do and will work better if you are down to your last twenty or so unsolved squares.
TIPS FOR SOLVING SUDOKU PUZZLES HARD CRACK
The solver worked it out, the most advanced strategy being used is "3D Medusa", really impressive.īowman’s Bingo doesn’t solve all ‘bifurcating’ Sudokus but if applied thoroughly it will crack more than 80% of them.
TIPS FOR SOLVING SUDOKU PUZZLES HARD ANDROID
I tried it by importing a Sudoku picked from the "very hard" level of a Android Sudoku App, on which I stuck quite a while. There's a online Sudoku solver, solving problem like a human (rather than a computer) with the following strategies. I heard some researcher accidentally found that their algorithm for some data analysis can solve all sudoku. How can a human being solve the so called "the hardest sudoku in the world", does he need to guess? Let us say the we know the solution is unique, is there any algorithm that can GUARANTEE to solve it without backtracking? Backtracking is a universal tool, I have nothing wrong with it but, using a universal tool to solve sudoku decreases the value and fun in deciphering (manually, or by computer) sudoku puzzles. Traditional sudoku means 81-box sudoku, without any other constraints. Here Guessing means trying an candidate and see how far it goes, if a contradiction is found with the guess, backtracking to the guessing step and try another candidate when all candidates are exhausted without success, backtracking to the previous guessing step (if there is one otherwise the puzzle proofs invalid.), etc. Is there any algorithm that solves ANY traditional sudoku puzzle, WITHOUT guessing?
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