Tutorial #43 The XY Wing Part 1

#sudokuguy #sudoku http://www.sudokuguy.com
Part 2 will be included in the next tutorial #44
This is another advanced technique which is rare and difficult to spot.
NOTE : the main point of the last section is to show that row 1 cell 8 will be a 7 because if the pivot is 4 or 5 in both cases the cell 8 will be a 7. I did not cover this as I should have. However please go to tutorial #44 where I show this again and explain the 7 more clearly.

NOTE In an XY wing each cell must have 2 small numbers (bi-value cells)
NOTE The 3 cells in an XY wing must have a 3X3 .e.i. each cell must have 2 out of the 3

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I also recommend you look at Tutorial #57

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At the beginning of this tutorial I talk about the fact that the nore techniques you know the easier the puzzle becomes. Also if you miss something you still may be able to solve the puzzle because you knew another technique to use.

NEW you can now go to my web site and see an INDEX OF VIDEOS under strategy headings.
Click on the number and it will take you to the video of interest.
*ATTENTION TEACHERS: A great resource. PowerPoint lessons, activities, and videos available in a teaching format on Teachers Pay Teachers https://www.teacherspayteachers.com/S...

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