Tag Archives: Nishio

The ANL Test


A review of Paul Stephens’ books continues here with my discovery that his Nishio procedure,  when properly applied,  can be a practical X-panel analysis technique to uncover obscure grouped almost nice loops (ANL).  I propose calling it “the ANL test”. … Continue reading

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To Nishio or Not to Nishio


This post examines Paul  Stephens’ favored form of Nishio, from his two current books on advanced Sudoku solving.  The analysis of the Addicts 140 determines the relationship between Stephens’Nishio and a simple test for grouped almost nice eliminating loops on … Continue reading

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Nishio Forcing Chains?


 Resuming the series on forcing chains, this post reveals that the Nishio forcing chain introduced on Andrew Stuart’s sudokuwiki site  is yet another re-interpretation of the AIC toxic set, a.k.a. the eliminating almost nice loop(ANL).  Here we also assert that … Continue reading

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