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Solution of Sudoku 9 (XV)

I think there is more solutions for this sudoku, e.g.

519782463
348965712
726134958
653819247
481257639
972643581
234598176
867421395
195376824

This solution actually does not work because R2C1 and R3C1 have a sum of 10. Notice that "ALL" neighboring digits with sum 10 are marked with X (and respectively sum 5 marked with V).

In row 1, the 4 and 6 total to 10, but this is not marked as X. Because ALL totals of 5 or 10 are supposed to be marked, this violates the rules of the puzzle.

Sorry about that - the previous comment appeared only after I typed my answer. :)