Tag Archives: AIC almost nice loops

Only Extreme 304 is AIC Level

Posted on May 7, 2019 by

This post and the next update Castillo’s Only Extreme Sudoku review with a solution of OnEx 304 without trials. Most of the solution path is in AIC building, the most challenging level of Sysudoku Advanced. The only move prior to … Continue reading →

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , , , | Leave a comment

World’s Hardest Sudoku 65

Posted on June 5, 2018 by

Not really hardest, but entertaining. World’s Hardest Sudoku 65 has a UR challenge, a UPE, a finned swordfish, an AIC ANL, and a very different color wrap. It’s also a few cells short of a multiple solution. Basics are moderate, … Continue reading →

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , , , , | Leave a comment

Only Extreme 132 Is Cut From the Extreme Team

Posted on October 24, 2017 by

Another example of expansion of a limited coloring network via the not-both test on an AIC slink. It’s an extreme tactic that need only be tried as a last resort. While the expansion does work in OnEx 132, it is … Continue reading →

Posted in Extreme Solving, Puzzle Reviews | Tagged , , , , , , , | Leave a comment

Fick’s Advanced Path on Only Extreme 3

Posted on October 3, 2017 by

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. … Continue reading →

Posted in Advanced Solving, Puzzle Reviews | Tagged , , , | Leave a comment

Remaining THLS XV hXY Avoided

Posted on January 17, 2017 by

Here we complete the report on the puzzles selected in The Hidden Logic of Sudoku to show that hidden XY chains are an “inescapable tool for the advanced player”, and therefore  require the generation and maintenance of symmetry grids. None … Continue reading →

Posted in Advanced Solving, Berthier, Puzzle Reviews | Tagged , , , , , , | 2 Comments

Hodoku Grouped AIC I

Posted on November 17, 2015 by

This post uses two grouped AIC ANL from Hodoku to illustrate how such chains are inspired and constructed. After the first, readers are challenged to try this approach on the following examples, with checkpoint to follow. I was prepared to … Continue reading →

Posted in Advanced Solving, Expert Reviews, Hobiger | Tagged , , , , , | Leave a comment

Simplifying Hodoku AIC

Posted on November 3, 2015 by

This post examines the AIC examples from the Discontinuous Nice Loop section of Hodoku Chain and Loop techniques page. Hodoku claims to demonstrate a new type of elimination technique based on AIC loops, called AIC Discontinuous Type 2. AIC ANL … Continue reading →

Posted in Advanced Solving, Expert Reviews, Hobiger | Tagged , , , , | Leave a comment

Revisiting Wex 435

Posted on July 21, 2015 by

This post updates the Weekly Extreme Review with a revisit of Wex 435, a puzzle that proved resistant to the single alternate Sue de Coq and was deemed the toughest in the review series, inspiring an extreme ALS trial, the … Continue reading →

Posted in Advanced Solving, Puzzle Reviews, Weekly Extreme | Tagged , , , , , , , , | Leave a comment

The Fata Morgana Exocet

Posted on June 16, 2015 by

Here we do the Sysudoku basic solving of the celebrity monster Fata Morgana, and develop a trial plan based on its exocet. The Sysudoku interpretation of the exocet as a trial generator is reviewed and two of the three exocet … Continue reading →

Posted in Extreme Solving, Monster | Tagged , , , , | Leave a comment

Shortz’ Trickiest Bewares?

Posted on July 9, 2013 by

This post reports a second  review of a Will Shortz “Beware! Very Challenging” collection, this one from his Trickiest Sudoku.   When the first review of this series, presented as Shortz’ hardest,  revealed the Bewares to be at the sysudokie basic … Continue reading →

Posted in Advanced Solving, Puzzle Reviews, Shortz | Tagged , , | Leave a comment