Category Archives: Puzzle Reviews

Reviews of preselected puzzles from published collections. Summary review table, and highlight analysis.

Puzzleproof’s Sudoku Extreme Is Good Basic

Posted on May 26, 2020 by

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

Posted on May 19, 2020 by

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?

Posted on May 12, 2020 by

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

Posted on May 5, 2020 by

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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Wrapping Up Nakamoto Extreme With 183

Posted on April 28, 2020 by

This post completes the review of the Nakamoto Extreme collection. The review table follows the finish of Nakex 183. A Sudokuwiki assisted solution of Nakex 183 continues with the second APE triggered by the first’s removal of 8r2c9. In this one, … Continue reading →

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Nakex 183 Hides the Keys

Posted on April 21, 2020 by

The last review puzzle, Nakamoto Extreme 183, follows the collection’s pattern of hiding easier removals behind methods that are very difficult to spot. An effective defense is to maintain bv maps, X-panels, and coloring clusters carefully as more advanced results … Continue reading →

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An Orphan Takes Down Nakamoto Extreme 163

Posted on April 14, 2020 by

In this post, AIC building is replaced by BARN’s, conventional chains, coloring, and a noteworthy pattern analysis result. Nakex 163 basic starts with a 3-fill. The bypass contains six more. Two resolve into clue and naked pair, and one, into … Continue reading →

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