Lesson 21.Sudoku. The Xwing plus scenarios.

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NOTE   I did not do this lesson very well.  I suggest strongly that if you go to tutorial #62 and #63  you will find the X wing much easier to spot and understand.

Another place to look is tutorial # 62 being uploaded in May 2020  Many of my players have mentioned that they are having problems with the X wing. Tutorial #62 gives a much more detailed look at the X wing....how to find it and what to do when you have found it.

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The Xwing is used when you have a difficult puzzle and you have had to put all the possible small numbers in empty cells.  This takes time. the challenge is to spot an Xwing.  I must apologise in that at the beginning example I put in numbers in column one (36 and 169) which should have not been there..Please ignore them. Hang in there.

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