I leave the rest of the solution to the readers.Ī second sudoku article can be found here. The rest of the puzzle can be easily solved by basic techniques. After all the redundant candidates in the empty cells are removed by the technique of "naked pair" new single candidates begin to appear in the puzzle. For example: Here there is only one place for the 2 to go, and that is the marked cell. Please note that applying deductions will often result in Indirect Solves. Below is a description of each, in order of their complexity. Click in the cell you want to solve first, then click this button. You can solve the puzzle completely, partially or solve a single cell using the buttons in the Solving section of the Features block. This means the redundant option 3 can be removed from cells (1,7) and (2,7) forming a naked pair with the candidate numbers 4 and 8.Ī puzzle consisting of only single candidates and naked pairs should be classified under the easy category. Again, a pretty easy one that everyone knows: When there is only one place in a particular row, column or block for a specific number to go, we can just fill it in. There are 8 different deductive techniques that SudokuSolver will point out for you when they are available. Enter the numbers of the puzzle you want to solve in the grid. As a result, the cells (9,7) and (8,8) form a new naked pair with the candidate numbers 5 and 6.įinally, the three cells (1,8), (2,8) and (3,9) in box 3 form a naked triplet with the candidate numbers 1, 3 and 9. Similarly, the redundant options 3 and 9 can be removed from cell (8,8). Hence the redundant options 2 and 3 can be removed from cell (9,7). The three cells (7,7), (7,9) and (9,9) in box 9 form another naked triplet with the candidate numbers 2, 3 and 9. This means that the three cells (6,2), (6,6) and (6,8) in row 6 form a naked triplet with the candidate numbers 5, 7 and 8. ![]() See the paragraph above Figure 4 if you cannot see why the 2 in (6,2) cannot be used. Youd see them as two pairs, if one of them wasnt hidden by sneaking in an extra 2. Look in this highlighted area: See that there are actually only two places where 1 and 3 can exist. In row 6, the only position possible for a 2 is (6, 4). This puzzle may require the use of the following techniques: Single Candidate. Hidden pairs and triples are quite a bit trickier to spot they’re hiding after all This technique is also known as Hidden Subset or Unique Subset, in general.
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