Category Archives: Basic Solving Procedures

Starting with slink marking to find all remaining candidates.

A Bracket Busting Dave Green 4-Star


Here’s the  basic trace on the Saturday Dave Green 4-star shown at the end of last week’s post. It survived the three Sysudoku Basic  phases: bypass, box marking and line marking. It’s the first I remember. Let’s talk through the … Continue reading

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Puzzleproof’s Sudoku Extreme Is Good Basic


Finishing with no advanced moves, the Extreme Sudoku 2 collection proves less than extreme. However, the collection, including the last three selected puzzles, 154, 175 and 196, have many worthwhile examples of basic slink marking in action. In the Pzlpfx2 … Continue reading

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Double Sweep Lessons From 112 and 133


Two rare double sweeps in the bypass show up this post. In Puzzleproof Extreme 122, it’s a 5-fill line; in 133, a 5-fill box. In each, 5 cells are free and two are claimed by two values, leaving a 3-fill. … Continue reading

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Can Box Marking Be Extreme?


This post continues the Sysudoku Basic review of Puzzleproof Extreme Sudoku 2, with reports on 70 and 91. In the basic trace of Pzlpf2 70, there is the typical heavy bypass, and collapse in the 9: box marking list. The … Continue reading

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Puzzleproof’s Extreme 2 is Box Marking Level


This begins a four post review of Puzzleproof’s Extreme Sudoku 2. The pre-selected puzzles are every 23rd puzzle starting with 7. All of the puzzles are solved in the bypass or in box marking. The review provides full tracing, and … Continue reading

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Super Fiendish Ends With 87 and 97


The review of Brian Challenger’s Sudoku Super Fiendish is ending quietly. SF 87 gets into beginning advanced, while SF 97 is finished in line marking. As to difficulty level, this small collection ranges widely and erratically. Is it  Fiendish? Not … Continue reading

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Super Fiendish Bookends 67 and 77


This post steps through the most fiendish of the 10 puzzles preselected for the review of Brian Challenger’s Super Fiendish Sudoku, SF 67. , and then adds one of the bypass victims, SF 77. Looking at the trace, you might … Continue reading

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Wayne Gould and Super Fiendish 4-57


This post reports two puzzles in the review of Brian Challenger’s Super Fiendish Sudoku, Sufi 47 and 57. Both are basic level, and in fact, half of the review puzzles are. For Sysudoku solvers, the term ‘fiendish’ is an overreach. … Continue reading

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Tracking a Patterns Game Entry


This post and the next explore two entries in the online Sudoku composing contest known as the “Patterns Game”. The contest is between Sudoku composers:  who can submit first puzzles with unique solutions that fit a “pattern” of givens issued … Continue reading

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Two more Basic FTSPAH, 64 and 164


FTSPAH 64 exits in the bypass, and illustrates several bypass tactics that avoid the curse – invoking frustration that the  composers of FTSPAH puzzles claim on their cover. Its post partner 164 illustrates more bypass moves and survives for a … Continue reading

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