Sandwich Sums

What is the Sandwich Sums rule?

Sandwich Sums is a variant sudoku rule: clues outside the grid give the sum of digits between the 1 and the 6 (or 1 and 9 in standard 9x9) in that row or column.

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.