{"id":494,"date":"2025-12-17T11:00:56","date_gmt":"2025-12-16T22:00:56","guid":{"rendered":"https:\/\/thesudoku.com\/blog\/?page_id=494"},"modified":"2026-07-14T11:57:30","modified_gmt":"2026-07-13T23:57:30","slug":"hidden-pairs","status":"publish","type":"page","link":"https:\/\/thesudoku.com\/blog\/hidden-pairs\/","title":{"rendered":"Hidden Pairs"},"content":{"rendered":"\n
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< Back<\/a><\/p>\n<\/div>\n\n\n\n

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How to Master the Hidden Pairs Strategy in Sudoku<\/p>\n\n\n\n

If you have already mastered Naked Pairs<\/em>, it is time to upgrade your puzzle-solving arsenal. The Hidden Pairs technique<\/strong> is a slightly more advanced reduction strategy. It requires a keen eye because, as the name suggests, the clue is buried beneath a clutter of other numbers.<\/p>\n\n\n\n

Just like in the \u201cHidden Single\u201d technique, we first need to find something hidden. But this time, we are looking for the pair that appears in only two cells in a unit.<\/p>\n\n\n\n

The Logic Behind the Hidden Pair<\/h2>\n\n\n\n

In a standard Naked Pair<\/em>, you see two clean cells containing only two digits (like 2 and 6).<\/p>\n\n\n\n

A Hidden Pair<\/strong> is different. The two cells might look crowded, filled with three or four candidates each (for example, 2, 4, 5, 6 and 1, 2, 6, 9). However, when you look closely at the entire row, column, or 3×3 block, you discover that the numbers 2 and 6 do not appear anywhere else in that entire unit.<\/p>\n\n\n\n

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\"Hidden<\/figure>\n\n\n\n
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Because every Sudoku unit must contain a 2 and a 6, and you only have two potential cells that can hold them, those two cells are legally locked.<\/p>\n\n\n\n

As you can see in this example, the values 2 and 6 appear only in two cells of this unit. This means 2 must occupy one of these cells, and 6 must occupy the other.<\/p>\n\n\n\n

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\"Hidden<\/figure>\n\n\n\n
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How to Apply the Strategy (Step-by-Step)<\/h2>\n\n\n\n
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  1. Scan for Rare Candidates:<\/strong> Look across a unit and find two numbers that appear very infrequently among the pencil notes.<\/li>\n\n\n\n
  2. Identify the Shared Cells:<\/strong> Notice if these two numbers always share the exact same two cells.<\/li>\n\n\n\n
  3. Isolate the Pair:<\/strong> Once you confirm that these two digits appear nowhere else in the unit, you have successfully found a Hidden Pair.<\/li>\n\n\n\n
  4. Clear the Clutter:<\/strong> So you can delete any other numbers in these cells.<\/strong> Since these two spots are strictly reserved for 2 and 6, no other candidates (like 3, 4, 7, 8, or 9) can possibly survive there. Erase everything else to leave a clean 2 & 6 pair!<\/li>\n<\/ol>\n\n\n\n
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    \"Hidden<\/figure>\n\n\n\n
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    Where to Look: Rows, Columns, and Blocks<\/h2>\n\n\n\n

    Hidden Pairs are versatile and can completely change the landscape of a gridlock depending on where they appear:<\/p>\n\n\n\n