Thursday, October 8, 2015


Notice: Toketa vol.3 will be published. See here.

Hitori is the puzzle appeared in Nikoli in 1990. Classical Hitori was only searching puzzle; looking for certain starting points, and searching the row/column of unblackened cells. That was all. It is often said that Hitori is not in favor because of unnecessary clue cells, but I think this is not bad when regarded as searching puzzle.
On the contrary, modern Hitori is rather logical. Especially, in harder puzzle, we need to consider global connectivity, and I love Hitori with this logical deepness. Here, the authors tend to try to make searching easier, and unnecessary clues can actually be unnecessary.

Here is a (modern) Hitori, it would be better not to fill in empty cells....

solve in PUZ-PRE

Most Hitori I have solved in contests are classical searching ones, where noise clues are valid. I want to solve logical Hitori more.
By the way, Hitori Round in Logic Masters 2014 was great. It suggests some ways to resolve problems about Hitori.

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