- Code: Select all
`.5...9...`

4.9..6...

2....7.3.

...4.2...

5...1....

.4...329.

...2....7

...6.14..

67..843..

I have run it through Sudoku Explainer using Solve Step until I reach:

- Code: Select all
`.5..49.26`

4.9.26...

2...57934

...492...

592718643

.4.56329.

9.4235.67

.2.6714.9

67.9843.2

At which point Sudoku Explainer recommends using a Nishio Forcing Chain to eliminate the 1 in r2c2 (starting with reset potential values it takes a few steps to get there, but it still gets there).

Looking at the accompanying Nishio Forcing Chain description it is describing the Block 3 vs Row 7 Empty Rectangle elimination from the point of view of the (only in this case) elimination cell. Does this mean that Empty Rectangles have an equivalent Rating of 7.6, or does it vary case by case?

(Incidentally, exactly the same set set of cells also produce a Nishio / Empty Rectangle elimination of 8 in r2c2, which comes up later in the Solve Step Sequence).