... by: MontyJust a question regarding these links. The first diagram on this page with the threes, should the top pair of threes and the bottom left pair of threes have green lines between them rather than blue, based on your statement that you use green links within a box?
I had a Sudoku which the solver marked two numbers in a row each of which had two other of that number in their respective columns as well as their respective boxes, but did not color either end of the link. Should the link have actually been drawn or do they only count if they contain three or more connections?
Would it be correct to say a link must always change direction from cell to cell, ie if the first link is horizontal (row) the next must be vertical (column) or diagonal (box)?