Rules:
Normal sudoku rules apply.
Digits in column 1 indicate the column in which the digit 1 appears in that row (e.g. if r4c1 is a 6, r4c6 is a 1). The same applies to columns 5 and 9, with the digits 5 and 9, respectively.
Digits on a line connecting two circled cells must be between the digits in those circles (i.e. the digit in one circle is greater than all digits on the line, while the digit in the other circle is smaller than all digits on the line).
Links:
Solution code: Row 3 followed by column 7 (left to right, top to bottom, 18 digits, no spaces)
on 24. December 2021, 14:18 by twototenth
Lovely puzzle - the break-in was gorgeous and there was rewarding logic from both constraints throughout.
on 6. December 2021, 17:01 by marcmees
very nice one. thanks
on 5. December 2021, 08:23 by henrypijames
Took me a long time to find the break-in. Once found, it seemed utterly obvious - but it was easy to overlook in a "missing the forest for the trees" kind of way.
on 3. December 2021, 19:18 by virtual
Beautiful interaction between between lines and 159! The break in was quite enjoyable and the rest of the puzzle flowed quite well.
on 3. December 2021, 17:29 by tallcat
Wonderfully constructed and takes good advantage of both constraints!
on 3. December 2021, 17:24 by the_cogito
Lovely puzzle, very instructive