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Tag Archives: pencil marking
Recovering From a Small Disaster
This post corrects an incorrect homework assignment, and announces some changes in Sysudoku due to a switch to a new computer and updated operating system. Last week was not a good one. On Tuesday I posted an incorrect puzzle for … Continue reading
Posted in Basic Solving Procedures
Tagged basic Sudoku, Bradley Hand ITC, Dave Green, pencil marking, slink marking bypass
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Basic Sudoku With Arnold
This post compares Arnold Snyder’s basic solving methods, the techniques leading to a full set of candidates, with Sysudoku basic. Snyder’s basic methods are described in Sudoku Formula 1 and Formula 2. A second post will evaluate the Snyder advanced … Continue reading
Posted in Basic Solving Procedures, Expert Reviews, Snyder
Tagged Arnold Snyder, basic Sudoku, box/line, pencil marking, slink marking, subsets
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The 2013 Akron Sudoku Tournament
Here’s my report on the second successful Sudoku tournament put on by the Akron-Summit County Library. Yours truly didn’t complete a single puzzle in the contest, but I renewed acquaintance with some phenomenal solvers. I’m including a trace and checkpoint … Continue reading
Posted in Basic Solving Procedures
Tagged naked pairs, pencil marking, slink marking, Will Shortz
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Box/Line Reduction
In a box/line reduction, or “box/line” for short, a line’s candidates for a number are restricted to one box. That makes these candidates a toxic set, since one of them must be supplied to the line. We can remove other … Continue reading
Line Marking Follow Up Actions
This post describes the follow up to the candidate fill of each line in Sysudoku line marking. This includes the marking of line slinks, checking for X-wings, identification of naked and hidden singles, and marking of bi-value cells. It also … Continue reading
Posted in Basic Solving Procedures
Tagged box/line, hidden triple, line marking, locked sets, naked triple, pencil marking, sudoku candidates, X-wing
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Sysudoku Line Marking
This post describes the Sysudoku basic technique of line marking, which pencil marks all remaining candidates, line slinks and bi-value cells. In a walk through line marking of the Sue de Coq classic, the efficiencies of line marking are explained. … Continue reading
Sysdudoku Box Marking
This post describes in detail the procedure of box marking, the first of two basic solving stages of Systematic Sudoku. Box marking identifies and marks slinks and naked subsets within boxes, as well as new clues. A walkthrough illustrates the … Continue reading
Posted in Basic Solving Procedures, Sudoku Toolware
Tagged basic Sudoku, pencil marking, Sysudoku box marking
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