Logic Masters Deutschland e.V.

This puzzle combines the anti-knight constraint with arrow clues. The breakin was adapted from a puzzle that I solved quite a while ago but couldn't find anymore. Please let me know in a comment I you know who discovered this initially.

Play Online: CTC, Sudokulab

Rules

• Normal Sudoku rules apply. Place the digits 1 through 9 in each empty cell. Digits must not repeat within the same row, column, or box.
• The digits along each arrow must sum to the digit in the circled cell. Digits may repeat along an arrow if permitted by other rules.
• Digits must not repeat in cells that are a chess knight's move apart.
• Cells on either side of the inequality symbol must have values that abide by the indicated relationship.

Hint

If you feel like you get stuck in the midsolve (after the breakin) because it seems hard to get to the outer columns (1, 2, 8 and 9), click the grey box to get some advice.

There must be two repeats between R4C3,R5C3,R6C3 and R4C4,R5C4,R6C4. Deduce from this that R5C3 cannot be a 3. Repeat this logic until you get a 12345 quintuple in row 5 that consists of a 15 pair, a 2 and a 34 pair. The outer parts of the row (R5C1,R5C2,R5C8,R5C9) should become very weak as a result.