HSSC Appetizer (3) - Weiqi
(Published on 20. December 2025, 06:00 by Richard)
The Dutch puzzle association WCPN is proud and excited to announce a fun online sudoku contest in the last week of 2025!
The contest consists of eight tougher sudoku variants. At the time that fits you best between 24 and 31 december you can start the contest and you then have 2,5 hours time to submit as many answers as possible. The puzzles are in pdf-format, like the grand prix and (qualifiers for) national championships.
The puzzle below was not selected for the contest, but suits very well as appetizer. The day after tomorrow I will publish one more appetizer.
Sudoku - Weiqi
Solve online in Sudokupad. (No solution checking.)
An easier example of this type can be found here: SVS #405
The contest is open to everybody who loves sudokus. The only thing you have to do is register yourself (at no cost) here. You can find the instruction booklet (IB) with all the info here.
Enjoy!
Apply classic sudoku rules.
For any black circle the sum of digits placed in adjoining cells is greater than 19 (2 by 2 cells), 9 (two border cells), or 4 (one corner cell), respectively. For any white circle, the sum of digits is smaller than 19, 9 or 4.
All possible circles are given!
Solve online in Sudokupad. (With solution checking.)
(If you want to participate in the contest, it is recommended to solve this puzzle on paper too. ;)
Solution code: Row 6
Comments
on 21. December 2025, 10:00 by Piatato
Very nice!
on 21. December 2025, 07:31 by Sandy329
This is the most challenging puzzle I have completed on my own so far
---
Reply: Well done! It's not an easy one at all. ;)
on 21. December 2025, 02:43 by walid_tun
I liked the logic. It's like multi-layered whispers.
---
Reply: thanks! I think it is a variant that offers a lot of different solving and setting options. Although solving will be often a time consuming activity. :)
on 20. December 2025, 21:06 by SennyK
This one was pretty challenging, I really liked the logic though! Thank you for setting :-)
---
Reply: thanks for your kind words, and not only for this one!
