Category Archives: Advanced Solving

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

Classic 48 Gets to the Crayons


The second Classic of Forest’s Classic Sudoku book 30 is a strategic win for Sysudoku Advanced. X-panel keys unlock an imbalanced web of 3, 6 and 8 candidates, allowing coloring clusters to carve it into four armies, which merge and … Continue reading

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Reviewing James Forest’s Classic Sudoku


This post presents a Sysudoku solution of the Classic 24, from James Forest’s Book 30. We’ll do every 24th Classic. The first suggests an easy basic and an interesting diversity of advanced methods. The bypass fills the East boxes with … Continue reading

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KD Insane 4×5 Caps the Review


KrazyDad Insane v.4, b.10, n.5, the last of the Insane review of 2013 is updated, with findings by Andrew Stuarts Sudokuwiki solver and YT. The solver gives us one of Andrew’s Type 2b UR, an ALS boomerang ANL, and something … Continue reading

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Sudokuwiki Gets a Second Chance


In a second updated review post on KrazyDad v.4, b.8, n.5 , Andrew Stuart’s Sudokuwiki solver gets the clue that the ALS boomerang left unresolved, and finishes the solution, with more instructive moves. You get a shot at that unusual … Continue reading

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Insane 475 by Sudokuwiki and SASdC


In the updated review of the KrazyDad collection of puzzles, Andrew Stuart’s Sudokuwiki solver is a backup on advanced solving, except in irregular XYZ, coloring, pattern analysis, and trials. Prior to the update on Sysudoku review of Insane 475 in … Continue reading

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The Especially Nice Loop of KD Insane 465


This post reports several features of an update of the post that introduced nice loop coloring. The illustrating nice loop was in itself remarkable. As shown already from books 1 through 5, KrazyDad’s hardest, the Insane collection, is hard enough … Continue reading

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The Insane 455 Pink/Olive Pattern Trial


This post reports on the updated KrazyDad Insane still at its posted date of August 20, 2013, but now updated to continue the introduction of pattern slicing, or pink/olive pattern analysis, by showing how it leads to decisive trials when … Continue reading

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