## Colouring (?) ~solved - thanks~

Post the puzzle or solving technique that's causing you trouble and someone will help
barbe rouge wrote:When Simple Sudoku says
that a puzzle is assymetrical what does it mean?

It means the starting givens are not placed symetrically.

This isn't a problem (apart from a very minor aesthetic one) but it's a warning so you'll double check the puzzle you've entered manually in case you've made a mistake (since the majority of puzzles are symmetrical).
angusj

Posts: 306
Joined: 12 June 2005

ronk wrote:It looks like single digit multi-coloring to me. Instead of being 5-sided turbot fish with 2 strong links (connected by a weak link), this one is 7-sided with 3 strong links (alternately connected by two weak links).

Ah - so I was correct in thinking that multi-colouring on 6s would lead to the same elimination in r4c3, but I didn't pick up the third conjugate pair in column 8.

Perhaps we need a third pair of colours to utilise in Simple Sudoku!
CathyW

Posts: 316
Joined: 20 June 2005

CathyW wrote:so I was correct in thinking that multi-colouring on 6s would lead to the same elimination in r4c3, but I didn't pick up the third conjugate pair in column 8.
There are actually 4 strong chains (albeit some with only 1 link) of conjugates, but only 3 are required to make an elimination.

Perhaps we need a third pair of colours to utilise in Simple Sudoku!
I suggest this workaround. Scan in order rows, cols, and boxes, coloring all cells in a strong chain with the same color. IOW initially disregard true/false parity. Then when you've zeroed in on a possible chain, re-color the true/false parity of that chain with the alternating colors of your choice. This might give you (enlargeable) images as follows:

xxxxxxxxxxxxxxxxxxxxxx

If the transition on a single grid is too confusing, just open a second Simple Sudoku window, cut and paste the puzzle, and then recolor in the 2nd window.

Ron
ronk
2012 Supporter

Posts: 4764
Joined: 02 November 2005
Location: Southeastern USA

Thanks Ron - that's a really helpful tip. Hopefully my attempts at multi-colouring will improve, i.e. ensure I pick up all the conjugate pairs. I find it a useful technique in harder puzzles that require something beyond, say, xy-wing.
CathyW

Posts: 316
Joined: 20 June 2005

angusj,
lol, never crossed my mind to rotate the
puzzle to see the symmetry...
Thanks for everything and congruts for
the excellent program you have created

ronk,
thanks for the tip
barbe rouge

Posts: 5
Joined: 26 January 2006

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