JZC 2017 was held in March as usual. I prepared round 3 by myself. It consists of 3 hard puzzles. Here are some notes for each.
From rob. Definitely this was the cause of its appearance in qualifying test. Original harder version is here.
The rule appeared in 2005.
Rule: Place the digits from the given range. Each cell contains 2 digits. A cell 'A B' means that the digit 'A' appears 'B' times in the same row and column, ignoring its own cell.
Original version is here.
At first, I intended to publish