# Tag Archives: Andrew Stuart

## Logic Justifies Aligned Triple AIC Hinges

This post takes on a challenge puzzle 17 which follows the Figure 30.1 of the previous post, in Andrew Stuart’s The Logic of Sudoku.   A boomerang ANL shows why aligned triple candidates are eligible to be AIC hinge partners. Logic … Continue reading

## Fleshing Out Stuart’s ALS Node Figure 30.1

Andrew Stuart’s The Logic of Sudoku, in a chapter on Almost Locked Sets, presents an example of an ALS node in a confirming Almost Nice Loop, as Figure 30.1. This post fills in the solution, before and after the series … Continue reading

## Other Pattern Trials for Unsolvable 190

This post continues with UnSolveable 190 to point out  alternative pattern trials leading to the solution, by clearing the monster fog of candidates.. Here again is the  grid after the blue pattern trial of the first 190 post.  Considering  the … Continue reading

## More 8-Pattern Trials on Unsolvable 190

This post continues  the resolution of the 8-patterns of Unsolvable 190 to a conclusion.  In the previous post, setup for the  double exocet solution was defined by a chute lettering table.  A freeform enumeration on the 8-panel divided six patterns … Continue reading

## The Exocet Chute Table on Unsolvable 186

This post illustrates a sysudokie human solver technique, the exocet chute lettering table, for the second time in the Unsolvable series. The method was applied to the double exocet of Unsolvable 181 in the post of February 18. Unsolvable 186 … Continue reading

## Sysudoku for Unsolvabrights

In this post, two distinctly Sysudoku techniques have roles in a pattern trial of an Andrew Stuart Unsolvable, this time #183 of January 16, 2016. First, pattern (template) analysis on two numbers finds compatible partial patterns for a coloring trial. … Continue reading

## How the BARN Was Built

This post continues a report on the discovery of a practical human solving technique and the need to have it properly classified and named. This method has been credited to its author, known by his forum moniker as StrmCkr, on … Continue reading

## Please Give WXYZ Some Space

This post takes issue with recent redefinitions of the WXYZ-wing It suggests a name for Andrew Stuart’s update, apparently proposed by StrmCkr, and recalls the Bob Hanson’s Bent Naked N-set method in Student Assistant. The derivation of the toxic set … Continue reading

## Nice Loop Coloring of Insane 465

This post introduces nice loop coloring, with a very special nice loop. Pattern slicing has a cameo role. The solution comes in a color trial suggested by  nice loop extensions. Stingiest on the bypass, 465 gives no more clues in … Continue reading

## Digit Forcing Chains?

Is Andrew Stuart’s Digit Forcing Chains a useful new solving technique? Actually, no.  Andrew’s  sudowiki site introduces digit forcing chains with examples that raise – and seem to settle – that question. Needless confusion is created by this unwarranted introduction. First, have you … Continue reading