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Results tagged with sudoku
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user 29
A Sudoku is a puzzle consisting of a grid to be filled with symbols, such that each constraining unit contains each symbol exactly once. The typical example is a 9x9 square to be filled with the numbers 1 to 9, where the constraining units are rows, columns, and 3x3 blocks.
2
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SuDoKu Unique Rectangles and the "2 blocks" rule
On HuDoKu's page on Uniqueness, under Unique Rectangle, it says
A common mistake when looking for URs is to violate the "2 blocks" rule (see the Sudopedia article for an example).
Unfortunately, …
- 1,823
11
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3
answers
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How can I spot an X-Wing?
I was doing a Sudoku puzzle (in my morning newspaper on the train to work) and got stuck at this point:
_ _ _ _ 4 _ 7 2 1
4 _ 2 6 _ 7 _ 8 9
7 _ _ 8 _ 2 _ _ _
2 9 5 4 6 8 _ _ 7
3 4 6 …
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