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Players have asked me to clarify the X wing. There are 2 types of X wing.. This tutorial shows you how to spot an X wing and then what to do once you have found it. The X wing is usually found in more advanced puzzles..
I Suggest that if you a new to sudoku please watch as I lay a foundation before working on spotting an X wing. You may wish to take notes. Tell your friends who have recently started solving sudoku.
For those very experienced and do not wish to see me lay the foundation at the beginning I introduce spotting the X wing a 10.50.
Here are the techniques and procedures used in this tutorial
TMB Lesson 1
LCR Lesson 2
Ramifications for all new numbers.
Matching pairs Many lesson and tutorials . Leeson 11 2 empty cells in a row, column or block = a matching pair. Removing numbers in a row, col or block which are not part of the matching pair, but have the matching pair numbers. Looking ahead before entering a matching pair.
Outside the puzzle.lesson 12 tutorial 40 and 41.
X wing Lesson 21
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