Classic 192 and Updated Only Extreme 3


First, a Basic trace of Classic 192. It can be solved in the bypass. In this post, James Forest’s Classic 192 is traced down in Basic. Then there’s a second Advanced level solution of Manuel Castillo’s Only Extreme 3, the first puzzle in the Only Extreme review. In the review, OnEx 3 was solved by not-both trials which promote an AIC slink chain – having slinks at each terminal – into a coloring link. The review was an occasion to demonstrate this tactic as a last resort, but with refinements introduced in Sysudoku AIC building, several of the Only Extreme “not-both” puzzles,  including OnEx 3 are solved without trial. An Advanced level solution of OnEx 3 appeared in the post of 10/3/17.  The second one of this post uses some interesting Sudokuwiki moves.

First, a Basic trace of Classic 192. It can be solved in the bypass.

 

 

For the Advanced level resolution of Only Extreme 3, start with the Basic grid and trace posted on August 29, 2017.

This time, right out of the hidden pair line marked grid, Andrew Stuart’s Sudokuwiki found a BARN, a.k.a. Bent Almost Restricted n-Set. After the BARN, the i186-wing, 4-chain, finned 5-wing and Wr4 Sue de Coq, still apply.

Then on the 6-panel a grouped nice loop takes out three 6-candidates.

 

 

 

 

 

 

 

 

An 8-chain triggers a naked pair.

 

 

 

 

 

 

 

 

 

In AIC building, two reverse bv support a confirming ANL.

 

 

 

 

 

 

 

 

The follow up marking includes a hidden dublex.

 

 

Coloring may be overdue. The blue/green cluster expands with two traps, with follow up marking.

 

 

 

 

 

 

 

This leads to three more traps, with follow up marking

 

 

 

Blue is confirmed, and the solution is immediate.

 

 

 

 

 

 

 

Next is Basic level Classic 216 and a report on the update of Only Extreme 132, originally posted 10/24/17. The pattern analysis that rescues an indecisive not-both trial now solves OnEx 132 without trials.

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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