What can X and Y be?

Try Doug Jelen's mysterious Knight Sandwich sudoku here (and don't forget the constraints): https://app.crackingthecryptic.com/webapp/3D2JHNDjB7
Normal sudoku rules apply, and identical digits cannot be a knight's move apart. Cages show the sum of their digits, and clues outside the grid show the sum of the digits between X and Y in that row/column; X and Y are to be determined.
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Hi! We're Simon Anthony and Mark Goodliffe, two of the UK's most enthusiastic puzzle solvers. We have both represented the UK at the World Sudoku Championships and the World Puzzle Championships. We're also "cryptic crossword" aficionados. Mark is the twelve-time winner of The Times championship and Simon is the former record holder for most consecutive correct solutions to The Listener crossword. We hope we can help your puzzle solving while also introducing you to some of the world's best puzzles.

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Видео What can X and Y be? канала Cracking The Cryptic