... by: sunshine 48
The last sentence in the paragraph should read ",but option A also excludes 6 in D3"
Nice job Andrew, thank you.
Andrew Stuart writes:
Amended! Thanks for finding that
... by: Camillo
I believe that "but option A also excludes the 2 in D3. " above should read "but option A also excludes the 6 in D3.
[Last line of the 6th paragraph.]
... by: Andrew Stuart
I've replaced the example at the beginning of this article as it didnt occur in the solver given the recent updates. So the conversation below won't now make sense (coordinate-wise). But I've also edited the text to remove the problems highlighted.
... by: Thesty
i think you guys are right that there is a mistake in the paragraph beginning: 'Looking at H6...'. but i think that paragraph is a 'red herring' - the mistake doesn't appear to affect the validity of the method. ignore that paragraph and just look at the next one.
so we're looking at the paragraph that begins 'Let us conjecture'. it explains that if you put a 5 in H6 then that forces 9s into H4 and B6 and thus a 5 into B4. that array of 5s and 9s forms the deadly pattern i.e. if that were right then the final grid would have an alternative solution (with those 5s and 9s reversed). thus the 5 can't go in H6.
what do you think?
... by: Otto
I have the same question as Dean on 7-JUL-2009. What (or where) is your answer?
... by: Dean
I have the same question as Don above except I can see why 9 can't be at B6. What I don't understand is why 9 can't be at A4 and B2 in option A.
... by: Don
In figure 1, BH46, I don't understand how option A forces 9 at B4. If H6 is 9, why can't 9 be at A4 and B6? I'm not arguing; I just don't understand.