XY-Wing Strategy: The XY-Wing strategy is a more complex technique that involves three numbers with two possible placements each. large print sudoku book Then, look for cells that have two candidates but one of them can be eliminated by looking at the row, column, or 3x3 subgrid. sudoku advanced tips
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large print sudoku book Coloring: Coloring is a technique where you assign different colors to different numbers in the puzzle. nyt medium sudoku answers Example: Consider the following Sudoku puzzle: +-------+-------+-------+ | 5 | 6 7 | 8 9 | | 1 2 3 | 4 5 6 | 7 8 9 | | 4 5 6 | 7 8 9 | 1 2 3 | +-------+-------+-------+ | 7 8 9 | 1 2 3 | 4 5 6 | | 2 3 4 | 5 6 7 | 8 9 1 | | 3 4 5 | 6 7 8 | 9 1 2 | +-------+-------+-------+ In this puzzle, we can identify an X-Wing pattern for the number 2 in columns 2 and 8.
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XY-Wing: This technique involves identifying a chain of three cells, each containing two numbers, which form a cycle. large print sudoku booksudoku.com.au For example, if you see three cells in a row with the numbers 1, 2, and 3, and no other 1, 2, or 3s in that row, you have identified a triple.
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