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Category Archives: Advanced Solving
Mixed Solutions on Nakamoto Extreme 63
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
Nakamoto Extreme 43 Redefines Sysudoku Extreme
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
Cluster Maintenance Pays in Nakamoto Extreme 23
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
Nakamoto Extreme 3 Exits in Full Color
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
A Coloring Tidal Wave Drowns Sufi 37
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
Brian Challenger’s Super Fiendish 7
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
Posted in Advanced Solving
Tagged Brian Challenger, finned X-wing, hidden triple, Super Fiendish Sudoku, XY ANL, XY-wing
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Tracking a Patterns Game Entry
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