Logic Masters Deutschland e.V.

This puzzle is an experiment to see how many constraints that I could put into the same puzzle, and I managed six - diagonals, sandwich, killer, clone, thermometer and (partial) anti-knight
Given the number of combinations included, the solution path is possibly quite wide, but I'd be interested in feedback on how this solves.

• Standard Sudoku rules apply
• Both long diagonals (marked) must contain each of the digits from 1 to 9 once only.
• Numbers outside the grid refer to the sum of the digits sandwiched between the digits 1 and 9 in that row, column OR diagonal. (The 29 and 5 on the top/bottom right are the sandwich figures for the respective diagonals)
• The two "C" shaped regions (shaded green) are clones of each other and must contain the same digits in the same location (no rotation)
• The two dotted areas are cages, and must add up to the small number (20) on the cage. Digits may not repeat in a cage.
• Digits on the thermometer must increase from the bulb end(s) to the flat end. (For the split thermometer, the two bulb ends can increase independently until they merge.
• In boxes 3 and 7 (shaded grey), the digits are subject to an anti-knights constraint and may not be placed a knights move away from an identical digit in another box. This constraint does not apply to pairs of digits not including either of these boxes - for example the same digits in box 1 and box 2 can be a knight's move apart, but matching digits in box 3 and 2 can not be.

Also, if I've managed it correctly, there should be a link to solve this via Penpa