- In “enclosing” puzzles such as slither link (popular Japanese number puzzle), if we focus on a corner, the number of edge lines between the corners can be 0, 1, or 2.
The case of 0 and 2 can be expressed with edge labels, but other information should be labeled in the corners.
1 corner faces 1; 2 or 1 (hereafter 21) faces 0 or 1 (hereafter 01)
Each numbered square conveys a corner number diagonally
The 3 squares turn 1 into 2. The reverse is also true.
The 2 squares are conveyed as they are.
A square of 1 makes a 1 a 0. The reverse is also true.
This can be used to propagate information diagonally, which can lead to clues such as the presence or absence of edges.
This page is auto-translated from /nishio/角に情報を載せる using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.