X-Wing question

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X-Wing question

Postby BamaFan » Wed Jan 19, 2022 2:09 pm

If a sudoku contains a x-wing, must it be solved by recognizing the x-wing? I have recently solved many sudokus rated as “hard” by the app, but have never solved a x-wing. I am wondering if they are present, but because I am a noob I am just solving around them.
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Postby 1to9only » Sat Jan 22, 2022 12:51 pm

Code: Select all
 . 1 . 2 . . . . .
 3 . . . . 4 . . 5
 . . . . . . 3 . .
 6 . . 7 . 8 . . 3
 . . . . . . . 2 .
 . 5 . 9 . 2 . . 4
 . . 8 . . . 1 . .
 . . . . 7 . . . 6
 . 9 . 1 . 5 . 7 . # Patterns Game 0234  #17 SE=3.2/3.2/3.2

This puzzle is from the Patterns Game.
It can be solved by finding 2 X-Wings (SE=3.2 rating) at the start, then it solves with singles only.
Or find the Hidden Pair (SE=3.4 rating) to start, and it then solves with singles only.

For more X-Wings at start of puzzle see this post: http://forum.enjoysudoku.com/sudoku-max-allowed-subsets-t38701.html#p300945
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