![]() 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. If we find numbers in any row or column that are grouped together in just one box, we can exclude those numbers from the rest of the box. 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. This strategy involves careful comparison of rows and columns against the content of boxes (3 x 3 cells). If there are three cells in a house (row, column or box) that have the same 3 candidates, you can eliminate these 3 candidates from all the other cells in that house. DKM Frame Sudoku has a very useful solve. 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. In solving any Frame Sudoku, it is crucial to know all the combination of three numbers that make up the frame totals. One of the first advanced Sudoku solving techniques that you might want to try is to start with one number at a time (starting with the number 1) and look for instances where two of the same number appear within the same set of three squares. 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. ![]() In row 6, the only position possible for a 2 is (6, 4). ![]()
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