Insane 435 By Irregular XYZ and ANL

The third puzzle in a review of the KrazyDad’s Insane collection, Insane v.4, b.3, n.5,  succumbs to bv scan removals.  Some a bit unusual, but no new  ground broken.  The collection resides at .

The updated basic trace includes the bypass with two  unresolved 3-forms.



Here with the line marked grid is the rarely spotted hidden unique rectangle, (tools page). When one corner is free of extras, and one UR value is slinked both ways from the opposite corner, the other UR value in the opposite corner forces a deadly rectangle.  Look for the hidden UR with those frequently occurring dead X-wings.

The next event is the regular 138-wing in the South boxes, with grouped victims seeing the 38 wing by a grouped 8-wing. After that, things got quiet until well into the X-panel, when the grouped 8- ANL turned up.

With that removal, It becomes a zombie movie. Weird wings popping up out of the ground.

First  a 683-wing with grouped  3-chain victim, creating a boxline removing two. Rectangular XYZ-wings rarely have victims.









Then,  a 136-wing, with victim seeing one toxic 6 via a long grouped 6-chain.









The party broke up and everyone went home after the grouped 6-chain ANL with follow up boxline removal and the 1-chain ANL .

This was a rare advanced level Insane, but wouldn’t you like to be sending this solution to a sysudokie friend as an attached presentation file?  You can do that. It’s all in the blog.


Next time, we seek out the secrets of Insane 445. Get ready with your own investigative results.

About Sudent

I'm John Welch, a retired engineering professor, father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. Sudoku analysis and illustration is a great hobby and a healthy mental challenge.
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