Lockout Lines

What is the Lockout Lines rule?

Lockout Lines is a variant sudoku rule: digits on a line must not be between the digits in the diamonds at each end, which must have a difference of at least 4.

In every puzzle here the setter’s own rules text is shown beside the board, so the exact wording for the puzzle you are solving is always one glance away. All normal sudoku rules apply unless the setter says otherwise.