Monthly Archives: December 2012

Stuffing Your Stocking

Posted on December 25, 2012 by Sudent

The resulting cluster extension leaves nothing but clues, bv and a single cell with three candidates,  a multiple solution situation the Sudoku community labels  BUG + 1. BUG stands for  Bi-Value Universal Grave, the reduction to clues and bv alone, … Continue reading →

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Forcing Chains in Sue de Coq Analysis

Posted on December 18, 2012 by Sudent

In this post, the classical forcing chain and a sysudokie endorsed application are demonstrated on a multiple solution puzzle. An underlying assumption made in solving a Sudoku puzzle is that it has one and only one solution.  Some composers offer … Continue reading →

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Unit Forcing Chains

Posted on December 11, 2012 by Sudent

Here I explain why sysudokies pass on Andrew Stuart’s Dual Unit Forcing Chains.  We also examine a triple unit forcing chain from Unsolvable 40. As of this post, this statement continues  to appear  in Andrew’s sudowiki.org introduction to Unit Forcing … Continue reading →

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ALS Merged Cell Forcing Chains

Posted on December 4, 2012 by Sudent

This post demonstrates the merger of cell forcing chains by means of ALS nodes.  I  checkpoint  three triple cell forcing chains from the challenge of the previous post, and argue that comprehensive search for cell forcing chains beyond the dual level … Continue reading →

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