Somewhat on a whim, dearest reader, I have decided to try and revive one of the lesser known institutions of nikoli.com. The idea was to gather together as many authors as possible to see what they could collectively achieve when they are additionally constrained by a fixed layout of givens.
I'd like to think this would work as an idea all by itself, but by means of encouragement I am willing to offer cash prizes of £25 to my three favourites. An additional prize of £25 is offered to the winner of a public vote. I will be accepting entries until the 31st January.
The Puzzle and the Layout:
For this competition, I have chosen Sudoku, without any extra rules, constraints or other variations. The layout of givens I would like you to follow is this one:
This layout is close to my heart, being very similar to the first ever puzzle I published on this blog back in 2009
. Back then I couldn't quite get this working without having to add an extra given digit at R5C5, but I'm sure my dearest readers will be able to manage without that.
As an example, I made a small nod to this in one puzzle I made for the 2014 World Sudoku Championships. This puzzle was additionally designed so that there was no given 9 in the grid.
Submitting your Entry:
Please let me know if this isn't working for you. I think it requires you to be signed in to Google to work, and you will need to attach your entry in a PDF or Image format.
The form should additionally allow you to edit your entry after submitting if you think you can do better, although please note that it will only accept one submission.
- No more than one entry per person.
- Collaborations between two or more people are permitted (However you will have to determine how to share any prizes).
- Each entry must be:
- A uniquely solvable puzzle under sudoku rules (no extra constraints or grid decorations permitted).
- Have given digits as per the given layout.
- Not totally computer generated (some computer assistance is fine).
- The last date I will accept entries is 23:59 GMT on Monday 31st January 2022.
- By submitting an entry, you retain full author's copyright, but agree to let me redraw your entry and publish it (with credit to you) on my blog.
- Entries must not be shared or discussed with other entrants before the winners have been declared.
I reserve the right to disqualify entrants and entries not conforming to these rules. My decisions are final.
- This will kind of depend on how well I've chosen the layout, and the entries received.
- The overall prize pool is £100. This will include £25 each for my three favourite entries, and a further £25 for the public vote.
- I am happy to send prizes internationally using services such as Wise - although please note that prizes will also need to cover any associated charges and fees.
- You do not have to claim the prize if you do not want to.
After the closing date I will anonymously draw up the entries for your solving pleasure. I am not sure how many entries I will get so I won't commit to a publishing date. However, after the entries have been published there will be a 7 day voting period. I will have a think about exactly how I want the voting system to work, but it is likely to involve individuals picking their top 3, and me somehow aggregating this information all together!
Any attempts to manipulate the voting will result in disqualification for the public vote prize.