Category Archives: Advanced Solving

Techniques applying after candidates are identified. Why they work. How and when to look for them.

FTSPAH 104 and 144


The review of the unspeakable FTSPAH continues with two more puzzles selected arithmetically. The basic trace of FTSPAH 104 is Sysudoku Basic at its best. A near collapse in the bypass is extended by a deferred hidden dublex, which 104 … Continue reading

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Systematic FTSPAH 44 and 84


This post demonstrates two more FTSPAH unlikely to frustrate anyone following the Sysudoku order of battle. FTSPAH 44 begins with an unusually large number of givens, which generates a correspondingly large number of 3-fills. In fact, the givens offer both … Continue reading

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The FTSPAH Review Begins With a Tour


Here I report on 4 and 24, the first two of 10 puzzles selected for the Sysudoku review of the FTSPAH puzzle book. Starting grids were displayed at the end of last week’s post.   I also explain a few things … Continue reading

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Master Class 120 Completes the Update


This post concludes the review update of Tom Sheldon’s Master Class Sudoku and offers an amended review table. The bypass on Master Class 120 is strong enough to keep line marking fill strings short. There are two naked singles, one … Continue reading

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PencilPress 81 and Master Class 110


This post concludes the review of PencilPress’ 500+ Sudoku Extreme Puzzles, and adds another puzzle to the review update of Tom Sheldon’s Master Class Sudoku. T The final score was PencilPress Extreme 0, Sysudoku Bypass 10. If “Extreme” means requiring … Continue reading

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PencilPress 73 and Master Class 100


Two Basic level reviews continue with Pencil Press  bottom right, page 73 and Tom Sheldon’s Master Class 100.Two Basic level reviews continue with Pencil Press  bottom right, page 73 and Tom Sheldon’s Master Class 100. Let’s begin with a Sysudoku … Continue reading

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PencilPress Bottom Right 17 and Moito III-4


The review of PencilPress 500+ Sudoku Extreme Puzzles continues with bottom right, page 17.  Along with that, we return with Sudokuwiki to Moito Road to Mastery III-4, for an alternative solution without a trial. There is nothing extreme about PencilPress … Continue reading

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