Tag Archives: color clusters

Two More Wex Join Sue’s Parade

Posted on May 19, 2015 by Sudent

In Weekly Extreme 432, a Sue de Coq shows some promising removals, but we never get there, because the verification trial solves the puzzle. After moderate basic solving in all three Sysudoku stages,     Wex 432 presents the Sue … Continue reading →

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LPO Color Trial on the HM Easter Monster

Posted on May 20, 2014 by Sudent

LPO pattern analysis is enlisted in the primary color trial of Hanson and Marans’ Easter Monster. Two clusters have been constructed by linking the 4/6 slink loops of W and S boxes along with the 3/7 slink loops of the … Continue reading →

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KrazyDad Super Coloring

Posted on April 2, 2013 by Sudent

This post follows the systematic dismantling of review puzzle SuperTough volume 5, book 8, #5, as it demonstrates the crushing logical power of Medusa coloring.  This completes the Sysudoku review of the excellent Super Tough collection found on http://krazydad.com. Here … Continue reading →

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Unsolvable 40 Logically Solved

Posted on October 30, 2012 by Sudent

In this post we checkpoint the solution of Stuart’s Unsolvable 40, via LPO and a coloring cluster extended by pattern slinks.  The solution of this puzzle by pattern analysis expresses well the ideals of Systematic Sudoku, and demonstrates what can … Continue reading →

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The Pattern Slink

Posted on October 23, 2012 by Sudent

Here I introduce a new form of strong link, the pattern slink.  The letter assignment panel for pattern enumeration in LPO identifies such slinks.  Every unit induced slink between a number’s patterns identifies two mutually exclusive sets of patterns.  This … Continue reading →

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Toxic ALS in Unsolvable 40

Posted on September 11, 2012 by Sudent

Our struggle with Unsolvable 40 continues with a detailed walk through of the search for ALS toxic sets, and an analysis of the its stuck number ALS. Here is our grid with row ALS superimposed on a thin, as yet … Continue reading →

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Dessert at the Colorful AIC Feast

Posted on July 3, 2012 by Sudent

Happy 4th!  Last post, on Maestro 49 of Fall 2009 we mixed coloring and AIC to good effect, and discovered the joys of the slink/wink color shortcut in AIC chains. We continue now with two clusters. The second, red/orange cluster … Continue reading →

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An AIC Checkpoint and Challenge

Posted on June 19, 2012 by Sudent

Here we finish off a puzzle that dazzles with artful AIC.  And I hand out a sysudokie AIC solo challenge.  First comes your checkpoint on the alternative route to the initial AN confirming loop, built upon the luscious 2-chain on … Continue reading →

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Coloring Sue de Coq and APE

Posted on June 5, 2012 by Sudent

Coloring is a general purpose weapon.  It limits the puzzle’s  ability to satisfy the restrictions imposed by  Sue de Coq and APE .  This explains why sysudokies  record the “almost” patterns found in the bv scan, and return to them … Continue reading →

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Bridging Coloring Clusters

Posted on May 29, 2012 by Sudent

With slinks left out of our Medusa coloring cluster, we can often form a significant second cluster, or maybe a third. Then the cluster colors interact through candidates of the same number that see each other or through colors of … Continue reading →

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