The XY Wing part 2 Tutorial #44

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This is another advanced technique which is rare and difficult to spot. some players call this a Y wing. The XY wing and the Y wing are very similar.

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 small numbers.

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This is part 2 of the XY wing. Or sometimes the Y wing. You may have noticed that I didn't remove the small 1's in row 2 of the second example when using the 5 in the pivot. I was assuming you would know that. It is another ram(ramification)
In this e.g. the common # in the wings is 1

I recommend you also look at tutorial # 57

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Видео The XY Wing part 2 Tutorial #44 канала Sudoku Guy