The 9 is thus eliminated from the rest of these rowsĪs in the preceding example, there are two columns (B and C) where 9 can be in only two possible cells each (B3 and B9, C2 and C8).īecause B3 and C2 as well as B9 and C8 are in the same block (instead of the same row as previously), 9 can thus be excluded from the other cells of these two blocks. ![]() There will thus be necessarily a 9 in the 2nd and 8th rows, either in B2 and H8 or B8 and H2. 9 can thus be eliminated from the other cells of these rows.įor column B, if 9 is not in B2, it is in B8 and inversely in column H. The same method applies in the case of two columns, the excluded candidates will then be on the rows.įor column B and H, the 9 is only possible on the 2nd and 8th row (blue cells). ![]() By recognizing these hidden patterns, you can eliminate those candidate numbers as possibilities from other squares. In this video youll learn how to use the Pointing pairs strategy in a Sudoku game'Pointing pairs' is an intermediate Sudoku technique. It involves identifying two or three candidate numbers that only appear in the same two or three squares within a unit (row, column, or box). The following methods are not necessarily more difficult to understand that the above ones, but it is not easy to spot when to apply them.įor a given number, when it’s only possible in two cells of two different rows, and that the four possibilities are on two columns (and form a rectangle), then that candidate can be excluded for the other cells of the column. The Hidden Pairs and Triples strategy is an advanced technique in Sudoku puzzle solving. Solving methods > 4- Complex methods > 4.1 Associated pairs (X.wing)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |