Sunday Stumper: Yajilin by Sam Cappleman-Lynes
Since 2021, we have posted some extra difficult Sunday Stumpers, about once a month. These will be quite tough puzzles, but with a logical path to be found (and solution videos to help). This twelfth Sunday Stumper of 2022 is a Yajilin puzzle by Sam Cappleman-Lynes with a tricky path into and out from the “Open Middle”.
(view directly for a larger image)
or solve online (using our beta test of Penpa-Edit tools using a composite mode where left click inside cell shades square, left click + drag draws line segment, right click inside cell adds dot, and right click on cell edge adds an x.)
Theme: Open Middle
Author/Opus: This is the 13th puzzle from guest contributor Sam Cappleman-Lynes.
Rules: Standard Yajilin rules.
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 8:30, Master = 12:30, Expert = 25:00
Solution: PDF and solving video.
Note: Follow this link for classic Yajilin and this link for Yajilin variations. If you are new to this puzzle type, here are our easiest Yajilin to get started on. More Yajilin puzzles can be found in The Art of Puzzles 2, in Yajilin by Murat Can Tonta and Prasanna Seshadri, and in our beginner-friendly book Logic Puzzles 101.
Thanks to the focus on speed-solving techniques in the solution videos for this week, I was able to just barely beat the Master time by a handful of seconds! I think that’s my first time being able to do that on a Sunday Stumper, so thanks for the tips you shared earlier, Thomas.
30:34