Tag Archives: color clusters

Two More Wex Join Sue’s Parade


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


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


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


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


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


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


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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