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 Post subject: Meandoku 21
PostPosted: Sat Aug 25, 2018 10:28 pm 
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Grand Master
Grand Master

Joined: Wed Apr 30, 2008 9:45 pm
Posts: 549
Meandoku NC X 21 and Meandoku NC 21

Meandoku (strictly extra) The following colour clues apply:
Green: the sum of the two adjacent cells is 8 or 9 only
Blue: the sum of the two adjacent cells is ten
Red: the sum of the two adjacent cells is 11 or 12 only
Yellow: the sum of the two cells is below eight
Black: the sum of the two cells is above twelve

I did the X first. I got a random solution out of JSudoku, filled in N1 and then the black clue in N5 which made it unique; but not of course solvable. I added the other three clues in N5 which gave 7 solutions by a quite difficult route. Then I had one of my common problems: when I added the two clues in N3 it solved but on going through it again there was now a simpler route. This made the puzzle easier than I wanted.

Hence I removed the X and added a couple of clues to make it unique again. Luckily it then solved without adding anymore clues and at acceptable difficulty.

As I've been out of the country and out of contact for three months I decided to post both.

As a minor challenge you will note that nonet one is very easy and I would like to improve the puzzle. How many clues can you reduce it to so that it still fully solves? Where there are two answers with the same number I will of course prefer the more complex one.

Good to be back here

Maurice

Meandoku NC X 21
Image

Meandoku NC 21
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