1/17/2024 0 Comments Sudoku strategy tutorial![]() 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. 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. If you are stuck on a particular Krazydad puzzle, drop me a note. 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. Troubleshooter 4: XYZ-Wing This is part of a series on puzzle solving techniques. 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. ![]() The game does, after all, involve analytical thinking. On the other hand, if you are an 'analytical thinker', stick around You have a head start. In fact, the boxes could just as easily be filled with letters of the alphabet, or even pictures Numbers are only used because they are well-recognized symbols. 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. This game doesn't really involve numbers. See the paragraph above Figure 4 if you cannot see why the 2 in (6,2) cannot be used. A Swordfish is a 3 by 3 nine-cell pattern where a candidate is found on three. ![]() We can extend this pattern to nine cells and achieve even more eliminations. This allowed us to exclude other occurrences of that number in either the row or column. In row 6, the only position possible for a 2 is (6, 4). With X-Wings we looked at a rectangle formed by four numbers at the corners. ![]()
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