Hi again Stefano,
stef71 wrote:
Can I ask you few more questions?
Sure, but sometimes it will take a couple of days before I am able to answer.
stef71 wrote:
I think that also the links within the "neat chain" are strong links (for example strong link on 6 between cells r5c4 and r1c4, on 4 between r1c4 and r1c6 and so on). Am I correct?
Not completely.
The XY-Chain in example 1 has six links. Four of them are strong links and two of them are weak links.
Which two are weak links is left as an exercise.
stef71 wrote:
And the difference between the strong links within the neat chain and the link on 9 between cells r5c6 and r5c7 is that the former is a link between two cand
idates in a bivalue cell, while the latter is a link between two candidates in a bilocation unit. Again, am I correct?
This conclusion is correct.
stef71 wrote:
Always in example 2, could you help me spotting all the conjugate pairs?
I have never had the need for using conjugate pairs.
Based on the definition at
http://www.sudopedia.org/wiki/Conjugate_pair I have found the following conjugate pairs in example 2.
r=Row, c=Column, n=Nonet.
Digit 1: r5, r6, c3, c5, n4, n5.
Digit 2: r4, r6, c4, c7, n5, n6.
Digit 3: r1, c3, n4.
Digit 4: r1, r4, c4, c6, n2, n5.
Digit 5: r4, r5, c3, c6, n4, n5.
Digit 6: r1, r5, c4, c5, n2, n5.
Digit 7: r6, r9, c4, c5, n5, n8.
Digit 8: r5, r9, c4, c7, n6, n8.
Digit 9: r5, r6, c6, c7, n5, n6.
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