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If you get to the point in a diabolical puzzle where you have potentially three numbers left
going in a column and probably three numbers going in a row and they intersect essentially
what you do is, you start by selecting one of the numbers and go up with the other potential
numbers and go across with the other potential numbers and see if that fits. When it doesn’t
you back up the same way you put the numbers in, so you end up back at the same square.
Now you take one of the other potential numbers and go up and go across and see how that fits,
if that doesn’t complete that column and that row you back up the same way you put
the numbers on they shape so you end up back at the same square. This time you take the
third potential number put in the other potential numbers in the row and the column and by that
process up and down, up and down you get to the point where you completed the puzzle.