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No markings in XV and Fives Sudokus

Sudoku 11 (XV Sudoku) and 16 (Fives Sudoku) in Round 2 did not have the markings "V" and "X". Did nobody else experience this problem? It is not the printer - the markings were not visible in the pdf either.

This is not a problem. The lack of markings meant that there were no pairs of adjacent cells anywhere in the grid satisfying the conditions.

Denis

Hi Goodie,

auroux is correct. There is a still a rule to both XV and Fives even where there is no marking, as stated in the instructions:

XV: Adjacent cells with no marking must not contain numbers summing to 5 or 10.
Fives: Adjacent cells with no marking must not contain numbers whose sum or difference is 5.

In other words, all possible markings are given. Sometimes it is possible for there to be no markings possible at all!

I hope that helps,

Tom Collyer
Competition Director,
WPF Sudoku GP 2016