Tag Archives: box marking

A Harder Kampbelmann, Barely Basic

Posted on May 31, 2022 by Sudent

Hard 143 starts with a stingy bypass, and requires box marking and some line marking. In the bypass, a r9 3-fill resolves  into SW8and the naked pair 36. W8 then follows, either from the 8’s dublex, or  from the West … Continue reading →

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Box Marking Subsets Maintain a CREATORS Collapse

Posted on May 10, 2022 by Sudent

Sysudoku weekly posts will soon be ending. This post may be the last one from the Akron Beacon Journal CREATORS series. In this one, Sysudoku box marking rescues us from a very stingy bypass, in ABJ Creators of 4/20/22. The … Continue reading → Continue reading →

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Touring the Bypass and a Human Engineered Inscription

Posted on March 21, 2017 by Sudent

This post continues the visit of Sudoku Satisfaction readers to Sysudoku with a demonstration of the slink marking bypass, line marking inscription, and basic subset spotting. How was lunch?  . . .  Good. OK, we’re ready to continue. Here is … Continue reading →

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The Sudoku Satisfaction Tour

Posted on March 14, 2017 by Sudent

In the next three posts, I introduce Sudoku Satisfaction  by Richard Nicholas Seemel, by inviting sysudokies to attend a tour for Satisfaction readers. The tour will highlight differences between  two systems that agree on basic solving approach, but not on … Continue reading →

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Jacobs’ Sudoku for the Brave

Posted on May 10, 2016 by Sudent

Coming back to basics, this post reviews Charlie Jacobs’ collection of basic puzzles, Sudoku for the Brave. The book has no commentary at all.  Just puzzles and solutions. Charlie labels his 200 puzzles “Extreme”, but they don’t come close to … Continue reading →

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An Update on the Slink Marking Bypass

Posted on January 6, 2015 by Sudent

This first post of 2015 updates sysudokies on the slink marking bypass, a preliminary stage of box marking introduced in late 2014. Experience now warrants that the bypass, as it will now be referred to, be accorded a permanent starting … Continue reading →

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The 2014 Akron Sudoku Tournament

Posted on November 25, 2014 by Sudent

Here is a report on my experience in the Akron-Summit County Library Sudoku Tournament of 2014 last Saturday. In particular, it’s a brief review on how well my recently introduced dublex bypass worked on the tournament puzzles. Each puzzle came … Continue reading →

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The 2012 Akron Sudoku Tournament

Posted on November 12, 2012 by Sudent

I have to interrupt my review of forcing chains to celebrate the hugely successful, first time Sudoku tournament put on by my hometown Akron-Summit County Library.  Upwards of 50 solvers enjoyed three 20 minute rounds, followed by an exhibition of … Continue reading →

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Box Marking of Maestro 4

Posted on May 17, 2012 by Sudent

This is an extra post for any sysudokies working up Maestro 4 for color bridging. After 1: NWm=>Wm, Sm.  2: Cm. 3:NWm=>Wm, Sm.  4: NEm=>Em.  5: SW5=>Sm. 6: Nm=>Cm, SWm.   7:  Nc5np67.  8:  9: NE9=>(SEm, NE4=>(NW4m, NE5m=>E5m), NE2m), Cm. the grid … Continue reading →

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Box/Line Reduction

Posted on January 31, 2012 by Sudent

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 →

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