Cec wrote:daj95376 wrote:".....Now, look at <8> in [row 5] & [column 7] and see how it affects [box 6] and, eventually, [r6c3]..."

In box6 I can see that digit 8 cannot go in r5 or in c7 but how do you determine where the 8 goes in the only two remaining cells r6c8 or r6c9.

You don't initially determine where

8 goes in [r6c89]. That's why I included the

and, eventually ... to indicate that

8 is eliminated in [r6c3] because it must be in [r6c89].

Cec wrote:On another matter which I've been reluctant to query but now wish to do so, I understand that <8> signifies digit 8. I'm not a mathematician but my recollection at school was that "<" meant "less than" and ">" meant "more than". Would it not be clearer to sudoku forum members to define digit 8 as simply digit 8 rather than <8>?

I don't have any idea when or specifically why I started placing inequality signs around digits. I suspect that it was to give them a distinctive appearance -- like my habit of using [r6c89], as used in chains, instead of r6c89, as used in sentences.

Sudoku members have no problem understanding that

Naked Pair 23 is about the digits

2 &

3 and not the number twenty-three. It should probably be written

Naked Pair {2,3}. I don't see it happening ... for clarity or any other reason.

It would be more accurate for me to use {8} if I'm going to enclose the digit

8. For clarity, I will try to drop the inequality signs and just use digits.