Category Archives: Basic Solving Procedures

Starting with slink marking to find all remaining candidates.

A Hidden Single Dispatches Beware 165


This post continues a review of Will Shortz’ Hard Sudoku, v.1. with the sixth of ten pre-selected puzzles. Each one is resolved at the basic level. The detailed review requires time and patience,   but its value is the detailed examples … Continue reading

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Be Especially Aware 155


This post demonstrates how, in line marking, the partially line marked grid invites the error of using  an incompletely marked cell as a completely marked one. Every Beware in this review of Will Shortz’ Hard Sudoku v.1 highlights a different … Continue reading

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It’s the Bypass In Hard Sudoku v1 145


I had Will Shortz’Hard Sudoku v.1 145 collapsing in box marking, showing that every phase of Sysudoku Basic is actively solving, not just accumulating candidates for advanced methods later. But in process of writing this up, I discovered that the … Continue reading

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Three Basic Phases on Beware 135


An easy basic workout, with help from 3-fills, a hidden single, many naked pairs, and a hidden dublex in Beware 135, the fourth in the review of Will Shortz’ Hard Sudoku, v.1. And two suggestions for Sysudoku readers. The basic … Continue reading

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Hard Beware 125 Bypass


This post continues the review of 10 pre-selected Beware! Very Challenging puzzles from Will Shortz’ volume 1 of Hard Sudoku, with Beware 125. The review is a Sysudoku Basic Clinic, all being solved before candidates are completed and advanced methods … Continue reading

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Chute Filling Beware 115


The second selection for the review of Will Shortz’ Hard Sudoku v.1 is Beware! Very Challenging 115. After a checkpoint on the Sysudoku Basic solution path, there is a brief report on the Guide’s Pattern Analysis page, now published in … Continue reading

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A Challenging Exercise in Sysudoku Basic


This post begins a review of Will Shortz’ Hard Sudoku, v.1.  The review details the solution of a pre-selected 10 puzzles from the “Beware! Very Challenging” section of that book. Nearly all Shortz puzzles reviewed in Sysudoku are solved in … Continue reading

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