The New Sudoku Players' Forum

[ronk]

I should like to add to the mention of bennys’ work by developing a couple of recent examples as I think he might have done in his original paper.

Your first example is an application of what bennys termed the ALS xy-rule in this forum. Yet you don't mention the xy-rule and you identify neither the 'x' nor the 'y' nor the 'z'. So how is your development like what bennys "might have done?"

And do you have a link for that paper?

[Steve R]

I'm sorry you found my homage inadequate. by all means add to it.

The thread starts here.

Steve

[claudiarabia]

So you can also use a kind of regional forcing chains based on Number 9.

Sorry, I'm not familiar with the "region forcing chain" term.

With region forcing Chain (from SE) I mean a chain which begins from every candidate of the same number x in one region (row/column/box). It proves another candidate y in a different region wrong, when all chains missed this candidate and put another candidate in the respective target-cell or change the location of the candidate y to another cell in the region.

Why you used the stars for C1 and F1 in addition to @ for A2 D2 and F1? What is the difference between them?

The '*' is for the naked pair ... and the '@' for the xy-wing.

Now I understand. Thank you.

Claudia