Hello,
I watched a tutorial on the X-Wing strategy. Why do they use the highlighted cells and cross out the 4s from the other cells? Couldn't you also look at rows 1-3?
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The rows 3 and 5 are taken because these are the rows in which the 4ns can be ONLY in the columns 2 and 5.
In rows 1, 2 and 6, the 4en can also stand in other columns, so you can’t use them to form the X-Wing.
The other highlighted 4en in columns 2 and 5 can then be deleted because the 4en in these columns must be mandatory in rows 3 and 5.