| Sudoku Tutorial |
| X-wing converts weak link to strong link |
| In row 2, there are 2 strongly linked 4's In row 8, there are also 2 strongly linked 4's in the same 2 columns (X-wing!) The now creates a strong link between the 4's in column 6, row 2 and row 8 (yellow squares) The remaining 4's can be eliminated from the other cells in column 6  (back) |
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