I have a question of a technique I've been using. I haven't posted about it before because I wanted to make sure the technique was repeatable under the same exact circumstances every time.

Essentially you highlight a pencil mark number and look at the pattern on how the cells are connected to each other. Generally the technique seems to work when your getting down to the last of that number on the board. That is, you'll be left with exactly four of that number on the board... in a rectangle/box formation. I think it would work if there were other, but unrelated cells to the pattern of that number on the board, but I cannot say for sure at this moment.

If you can choose a single cell with a number and select that. the resulting pencil marks of that number will be left in a box/rectangle formation.

If your able choose 2 or more different cells, and each cell leaves a different box/rectangle, you cannot use the technique. I call that intersecting boxes formation, since you choose 1 cell and you'll have a box this way, or a fill in a different cell and end up with a box a different way. It won't work then.

It's not an exact pattern, other than the fact that there will always be ONLY a single cell you can choose that will result in have exactly 4 pencil mark numbers left in a box pattern. [Excluding cells that have no relationship to the pattern your looking at.]

Looks like I'm doing puzzles in the 5.0 to 6.0 (SE rated) range of difficulty, but I was using the pattern long before, but since it's not in every puzzle, it took a while for me to be sure of the technique.

I'll post a game position next time I come across that. I did 5 puzzles yesterday and the technique cropped up once, and I'm not sure which puzzle it was on.