A funster Extreme 116 Labor Day Special


An effective bypass, and a simple uniqueness rectangle, and three choices to close down funster Extreme 116 early. Charles Timmerman’s funster Extreme collection is less than  extreme, but a good introduction to advanced solving methods.

The basic work is easy, because the bypass does most of the heavy lifting.

 

 

 

 

 

Advanced 116 begins with a Type 1 unique rectangle.  Candidate 1r6c8 is required to prevent an obvious multiple solution. The two candidates seeing it must go.

 

 

 

 

 

After a follow up of

 

there is a choice of three triggers for the collapse:

You have a border hugging XY nice loop.

 

 

 

 

 

 

 

 

 

Or a deceptively decisive Almost Nice Loop.

 

 

 

 

 

 

Or, if you’re a snapshot collector, or always do XYZ wings first, a regular 489-wing with a far seeing victim.

 

 

 

 

 

 

 

Our final funster selected for the review is Extreme 130. Review table next tim. The next review collection is Will Shortz’s Hard Sudoku, v. 1. Find the previous Shortz collection reviews on the Titles page. The latest new Guide page is about AIC Hinges, a topic way beyond Shortz.

 

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About Sudent

My real name is John Welch. I'm a happily married, retired professor (computer engineering), timeshare traveling, marathon running father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. The blog is about Sudoku solving. It covers how to start, basic solving to find candidates efficiently, and advanced solving methods in an efficient order of battle. It is about human solving methods, not computer solving.
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