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Yajilin&Variations - 30.08.-2.09.19
Next Weekend, I'm going to run my first puzzle competition, called "Yajilin & Variations"!

The competition takes place on this website, and lasts from 30.8.19 until 2.09.19.
The Instruction Booklet with all further information will be released tomorrow at 10 a.m.

If you have any questions, please post them here. 
I hope you enjoy the Puzzles!


Nächstes Wochenende findet hier auf der Website mein erster eigener Wettbewerb statt! 
"Yajilin&Variations" wird vom 30.8. bis 2.09.19 stattfinden. Die Anleitung mit allen weiteren Informationen wird morgen um 10 Uhr freigeschaltet. 

Fragen können in diesem Thread gestellt werden. 
Viel Spaß mit den Rätseln!

Die Anleitung ist jetzt auf der Wettbewerbsseite verfügbar.

The Instruction Booklet can now be downloaded from the contest page:
Super Idee. Ich freue mich schon!
The contest has started. Good luck and enjoy the puzzles!
it has been a good contest. Nice variations and a good system to learn some new solution techniques

could someone please check if my answers to the caste wall variants have been accepted. I submitted them 2 minutes before the end and they appeared on the summary immediately after (with the clock still running) but they are not shown now.

Stefano (sf2l)
Vielen Dank, Jonas, die Rätsel waren einfach super! Hat riesigen Spaß gemacht!
Schöne Rätsel, aber für eine Durchschnittslöserin wie mich wieder mal viel zu schnell vorbei. Nach Ablauf der Zeit fehlt mir einfach die Motivation, die restlichen Rätsel auch noch zu lösen. Ich hätte gern längere Zeitfenster, beim Schach gibt es ja auch nicht nur Blitzturniere.
The contest is now over, and you can check the results table. Any protests can be written to me until Wednesday, 10pm. After that, the results will be final.

Thanks to all the participants for giving my puzzles a try! I hope everyone found something fun to do with their solving time. I began working on this competition all the way back in January, and put a lot of effort into it, so I hope you enjoyed solving the puzzles as much as I did constructing them. If you have any questions about the puzzles, feel free to ask.
I'll write some design comments about the individual puzzles in a separate post.
Some design comments, spoilers for the puzzles if you haven't solved them Wink

The 8 Standard puzzles are in the order in which I constructed them. Number 1 has a "Clockwise Countdown" theme, with each ring of clues consisting of 3210 and a clockwise arrow sequence in the outer two rings. With number 3 I wanted to construct a puzzle with very few clue cells. Puzzles 5 and 6 were inspired by the many Yajilin puzzles you can find on twitter by japanese authors. With puzzle 7, I tried to make the solving path diverse while sticking to one kind of clue only. Puzzle 8 can be solved by careful marking of empty cells, but in the top left corner it is faster to note that one entrance is in column 1 or 2, so column 4 cannot have 2 entrances, which immediately resolves the 2-up clue.

Regional Yajilin is one of my favourite variants, and I constructed some before for this year's Puzzle GP. The second one (with a "double digit" theme) is quite hard, but logically solvable, with a path that starts at the 5 and 4 and then proceeds anticlockwise. The end uses a difficult parity step, where you can use the fact that a loop always has an even number of cells to determine that there must be an even number of black cells, which helps to resolve the puzzle logically.

Myopia was fun to construct, I wanted to use a symmetrical layout with as few clues as possible. Getting a 10x10 puzzle with 6 symmetric clues to work was quite challenging.

I'm not sure if the star battle hybrid has been done before, but I wouldn't be surprised if someone has thought of it. The second one was challenging to make, because you can really only place two different clues, and it is very easy to get either zero or too many solutions, or to need a lot of extra empty
clue cells to get it unique.

Total False is a variation that I've seen on It's quite easy to miss possible deductions or mistakes while making them, and in fact the second one was broken in an earlier version which I didn't realize until months after constructing...

Cipher Yajilin is in fact the first Yajilin type I constructed and published on the portal. The first one is an easy one, but I'm happy that this layout works.

I wanted to do something different with the Outside puzzles, so I used a global break-in for the first one which I hadn't seen in Yajilin before.
The second one has a rather unconventional path: An Outside puzzle with an empty top will always have at least two solutions because you can flip the puzzle along a vertical axis. The adjacent rows of threes have only two options, and the are mirror images of each other. The intended path is to realize that the 1 clue on the top is there to disambiguate the "flipped" solutions, and you can pick one of the options for the 3s by going with your gut feeling (aka "guessing"). You can then solve downwards using only the row clues, and see if the 1 clue works. If it does, you picked the right orientation. If it doesn't, you don't need to erase everything, simply place the 1 clue in column 8 and solve the "flipped" version! The answer key is chosen so that it is not affected by this.

The Castle Wall puzzles were fun to make, the rules may have been slightly confusing, so I gave them a little more points. I would like to make some more of these in the future.

Double Yajilin is another type from gmpuzzles. I hope the second "clueless" puzzle was a surprise for some of you.

Unequal lengths as a loop variation first appeared on a Puzzle GP round this year. I think it is an interesting rule that can change things quite dramatically. Getting it to work in Yajilin was a huge challenge, as you get contradictions all the time because the type is so constrained. I'm very happy with the two puzzles, but I don't think I'll make more of them in the near future, because the second one in particular really exhausted my patience. Luckily, tweaking the grid to 10x11 resolved the puzzle without using much extra clues, and I'm still amazed that this actually works Biggrin (Also, I noted that the two puzzles use a 1 clue, a 2 clue, a 3 clue, and 4 empty clues, which was unintentional).

If you have comments or questions about the puzzles, you are welcome to post them here.

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