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Poor visibility gray areas

Excellent job "Swiss" section. Thanks, Fred.

And now for comitee :-)
The general problem I see in the use of gray areas. If you are printing on a laser printer, then it is very poor visibility of all the numbers in these cells. Additionally, when the erasure is also discolors the surface. If it is absolutely necessary for certain types of puzzle, it can not be otherwise. But need to use to indicate the main diagonal is completely unnecessary.

Nice day
Raul Kacirek

Thanks for your comment.

We use colored marks (whether gray or black) only when necessary, and specifically to highlight the distinct aspects of the types. The goal -- with only a few exceptions in some cases like "nonconsecutive" sudoku or other "anti-" types -- is for the variation of a sudoku to be clear when first viewing it, without needing to look at the name. Because a diagonal sudoku can easily be confused for a classic sudoku without the main diagonals marked, this is why they are marked. In Sudoku GP1 the Diagonal sudoku was the easiest variation and ended up right after the Classic Sudoku section. Without the markings we would have had to put it much farther back in the booklet to be comfortable solvers would not start to solve it as a Classic and then run into problems.

Try printing in draft mode. The shading is lighter that way generally.