Category Archives: Advanced Solving

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

Mixed Solutions on Nakamoto Extreme 63

Posted on February 18, 2020 by Sudent

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 Sudent

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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Cluster Maintenance Pays in Nakamoto Extreme 23

Posted on January 28, 2020 by Sudent

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 Sudent

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 Sudent

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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Super Fiendish Bookends 67 and 77

Posted on December 31, 2019 by Sudent

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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A Coloring Tidal Wave Drowns Sufi 37

Posted on December 17, 2019 by Sudent

Here, Brian Challenger’s Super Fiendish 37 makes it to advanced, but with the bi-value field   inviting multi-cluster coloring, a systematically easy solving technique. There are some X-panel fruits to harvest first in the order of battle, before coloring closes the … Continue reading →

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Brian Challenger’s Super Fiendish 7

Posted on December 3, 2019 by Sudent

The review of Challenger’s Super Fiendish collection opens with a long post, revisiting some advanced methods not seen here recently. Somewhat fiendish is the stonewalling in basic. The bypass gets nowhere, and the hidden triple alone removes candidates. Here is … Continue reading →

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Metcalf’s Second Patterns Game Entry

Posted on November 26, 2019 by Sudent

This post reports a Sysudoku solution path for Mike’s second Patterns Game entry on a extraordinary pattern of givens. As a successful entry, I believe it had to meet the contest requirement for a simpler solution than is found here. … Continue reading →

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Tracking a Patterns Game Entry

Posted on November 19, 2019 by Sudent

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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