Category Archives: Advanced Solving

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

Funster Extreme 4 has a Near BUG


The review of the Extreme section of Charles Timmerman’s Funster Hard to Extreme Sudoku is underway, with Funster Extreme 4. Funx 4 has a near BUG, but it gets to the doctor early and takes Dr. Stuart’s medicine dutifully. An … Continue reading

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A Guide Update and a Funster Kick Off


The threat of a “The World’s Hardest Sudoku” now relieved, this post starts a review of the “extreme” section of Charles Timmermans Funster Hard to Extreme Sudoku. But mostly, it’s a progress report on the Guide, a set of pages … Continue reading

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Painting a World’s Hardest BARN


This post ends the review of World’s Hardest Sudoku Book with its Very Hard 134.  The puzzle is not all that hard, but does allow solution in a very pleasing way, for me, at least. Right after a basic with … Continue reading

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An Untyped UR Rattles World’s Hardest 188


The review of World’s Hardest Sudoku continues with a quick dispatch of puzzle 188 by a unique rectangle and straightforward coloring. The UR fails its type category, but the examination uncovers an almost accidental chain interpreted after the fact as … Continue reading

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Coloring Wrings Out World’s Hardest 102


World’s 102 starts without ‘1’ givens and with two 3-fill lines. It winds up in a coloring trap expansion into a wrap. Basic makes progress in all three phases.               Making a hasty bv … Continue reading

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World’s Hardest Sudoku 65


Not really hardest, but entertaining. World’s Hardest Sudoku 65 has a UR challenge, a UPE, a finned swordfish, an AIC ANL, and a very different color wrap. It’s also a few cells short of a multiple solution. Basics are moderate, … Continue reading

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LPO Knocks Out World’s Hardest 36


A challenge posed by The Worlds Hardest Sudoku Book 36: Is there a route to the solution less advanced than pattern analysis? The puzzle is otherwise distinguished by a BARN right out of line marking, and a notable lack of … Continue reading

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