Category Archives: Puzzle Reviews

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

Sudokuwiki Ends Nakex 63 On Its Own

Posted on February 25, 2020 by

This post picks up on the Sudokuwiki/Sysudoku resolution of Nakamoto Extreme 63 where it was overtaken by pattern analysis and coloring, and finishes it in two ways, one humanly practical and one not. Sudokuwiki doesn’t maintain coloring clusters between moves, … Continue reading →

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Mixed Solutions on Nakamoto Extreme 63

Posted on February 18, 2020 by

This post reports Sudokuwiki AIC building in Nakex 63, until it is overtaken by pattern analysis and coloring. The solver’s path is continued in the following post. Nakex 63 basic is tough, despite a productive bypass.     The first … Continue reading →

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Nakamoto Extreme 43 Redefines Sysudoku Extreme

Posted on February 11, 2020 by

This post recounts another AIC building project of 15 boomerangs, Nakamoto Extreme 43. The Nakamoto Extreme collection justifies the ‘extreme’ label by possibly exhausting the time and patience of a human solver.  Let’s say, if a puzzle justifies a trial … Continue reading →

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Sudokuwiki Reaches Its Digit Forcing Chain

Posted on February 4, 2020 by

This post illustrates the power of coloring to employ the strong link network, and again rejects Andrew Stuart’s Digit Forcing Chains?. The post bypasses the Nakamoto Extreme 23 coloring wrap of the previous post, and follows Sudokuwiki AIC building  to … Continue reading →

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Cluster Maintenance Pays in Nakamoto Extreme 23

Posted on January 28, 2020 by

In this post, a cluster wrap interrupts the Sudokuwiki march on Nakamoto Extreme 23, with an abrupt collapse. The following post then follows the original solution through to another example of Andrew Stuart’s “digit forcing chain”, to note that human … Continue reading →

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Nakamoto Extreme 3 Exits in Full Color

Posted on January 21, 2020 by

This post continues the Sysudoku report and supplemented Sudokuwiki solution of Nakex 3. We pick up from last week with matching  8 pairs in E and SE. The starting slink has been available since Sudokwiki entered AIC building, but new … Continue reading →

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Reviewing a Truly Extreme Collection

Posted on January 14, 2020 by

This post and the next initiate a review of Sudoku Puzzle Book, Extreme Level by J. B. Nakamoto, with Nakex 3. The review combines moves by Andrew Stuart’s Sudokuwiki solver with Sysudoku alternatives, while reporting and interpreting moves in accordance … Continue reading →

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