{"id":516,"date":"2025-12-17T12:10:07","date_gmt":"2025-12-16T23:10:07","guid":{"rendered":"https:\/\/thesudoku.com\/blog\/?page_id=516"},"modified":"2026-07-24T16:46:56","modified_gmt":"2026-07-24T04:46:56","slug":"pointing","status":"publish","type":"page","link":"https:\/\/thesudoku.com\/blog\/pointing\/","title":{"rendered":"Pointing"},"content":{"rendered":"\n
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< Back<\/a><\/p>\n<\/div>\n\n\n\n

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How to Use the Pointing Pairs Strategy in Sudoku<\/p>\n\n\n\n

As you move deeper into intermediate Sudoku puzzles<\/strong><\/a>, you will need strategies that look at how different regions of the board interact with one another. The Pointing Pairs technique<\/strong> (sometimes involving three cells, known as Pointing Triples<\/em>) is a fantastic tool that uses the layout of a single 3×3 block to eliminate candidates across an entire row or column.<\/p>\n\n\n\n

Pointing applies when a candidate appears only in one row or column within a box. When this happens, that box “points” down the line, clearing out impossible numbers.<\/p>\n\n\n\n

The Logic Behind Pointing Pairs<\/strong><\/h2>\n\n\n\n

Every 3×3 block must contain the numbers 1 through 9. Sometimes, when you fill out your pencil notes, you will notice that a specific number is completely restricted to just one line inside that block.<\/p>\n\n\n\n

Let\u2019s look at this box. All cells that might contain the value 4 are located in the same column.<\/p>\n\n\n\n

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\"Pointing<\/figure>\n\n\n\n
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Because the number 4 must<\/em> be placed somewhere inside this box, and the only available spaces for it sit on that specific vertical line, we hit a logical certainty: 4 must definitely be placed in one of these two cells.<\/strong><\/p>\n\n\n\n

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\"Pointing<\/figure>\n\n\n\n
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The Power of Elimination (Step-by-Step)<\/strong><\/h2>\n\n\n\n

Once you establish that the number 4 is locked into that column inside the box, it has massive consequences for the rest of that line:<\/p>\n\n\n\n

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  1. Find the restriction:<\/strong> Scan a 3×3 block and notice that a candidate (like 4) only appears in a single row or column within that block<\/em>.<\/li>\n\n\n\n
  2. Project the line:<\/strong> Extend your eyes along that entire row or column across the whole 9×9 grid.<\/li>\n\n\n\n
  3. Clear the outside cells:<\/strong> This means that 4 can\u2019t appear anywhere in the column outside the box.<\/strong><\/li>\n<\/ol>\n\n\n\n
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    \"Pointing<\/figure>\n\n\n\n
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    Because that specific block is guaranteed to claim the number 4 on that line, no other cell in that column (in the blocks above or below it) can possibly hold a 4. You can safely delete the number 4 from the pencil notes of every other cell along that entire line outside of your target box.<\/p>\n\n\n\n

    Pointing Rows vs. Pointing Columns<\/h2>\n\n\n\n

    This strategy is highly versatile and works in both directions across the grid:<\/p>\n\n\n\n