Fick’s Advanced Path on Only Extreme 3

In the pre-review post of August 29, Cluster Extension by Not-Both Trials, a series of coloring cluster expansions were made by testing the not-both condition for AIC slink coloring. Like other trials, this tactic is considered extreme here in Sysudoku. My friend Gordon Fick responded with a grouped AIC ANL which keeps Only Extreme 3 in advanced Sysudoku territory.  Here we use it, after the irregular XYZ, AIC nice loop, finned X-wing, and Sue de Coq of the pre-review post.

Here is the grid  after the follow up of the Sue de Coq, showing  the two AIC slinks  under consideration for blue/green expansion. 

Beginning in the NE, the AIC does a grouped 8-chain slink and reversed XY to 6-chain to XY terminal, removing two 8’s.


The follow up





brings the 6-wing that Gordon anticipated in his alert.






a new red/orange coloring traps 3r7c4 to wrap red and hand in the orange and blue solution.

Unless you consider Gordon’s AIC ANL extreme, and many would agree with that, Only Extreme 3 is only advanced.

Now to Only Extreme 46.


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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