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“[G]igantic in height, and muffled in a cloak,[…] the head, which should have rested on his shoulders, was carried before him on the pommel of his saddle!” —W. Irving

The Headless Horseman

In this puzzle, normal sudoku rules apply. There is a global antiknight constraint: digits a knight’s move apart in chess must be different. Additionally, please observe the following standard constraints:

• German whisper: any two digits in adjacent cells along green lines must differ by 5 or more.
• Renban: digits falling along a given magenta line form a set of consecutive digits in any order.
• XV: two cells connected by a question mark contain digits that sum to 5 or 10.

Happy solving!

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