Category Archives: Uncategorized

Carol Vorderman’s Super Difficults


This post considers Carol Vorderman’s “difficult” collection as a practice field for the Sysudoku bypass. Carol’s tips for solving are described, and sysudokie homework on the walkthough “difficult” example is checkpointed. The review of Master Sudoku is concluded with Vorderman … Continue reading

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Hodoku Grouped AIC II


This post continues with two more Hodoku examples, which illustrate how a human solver finds grouped AIC. As usual, Hobinger attributes them to making just the right premise at just the right place. In the Hodoku Grouped AIC section, the … Continue reading

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ALS Merged Cell Forcing Chains


This post demonstrates the merger of cell forcing chains by means of ALS nodes.  I  checkpoint  three triple cell forcing chains from the challenge of the previous post, and argue that comprehensive search for cell forcing chains beyond the dual level … Continue reading

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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

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Beginner’s Page


I’ve added a page demonstrating dublexes and cross hatching, for begineers. There was a little hitch getting images and text to display, but I think its cured now.  If you know anyone who couldn’t get started on the blog, please … Continue reading

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What this blog is about.


Welcome to Systematic Sudoku.  The blog is about “human engineered Sudoku solving”.  This means practical and efficient ways for humans to solve Sudoku puzzles.  And I mean humans, not computers.  It’s about taking advantage of human abilities to discover the … Continue reading

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