Category Archives: Advanced Solving

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

Logic Justifies Aligned Triple AIC Hinges


This post takes on a challenge puzzle 17 which follows the Figure 30.1 of the previous post, in Andrew Stuart’s The Logic of Sudoku.   A boomerang ANL shows why aligned triple candidates are eligible to be AIC hinge partners. Logic … Continue reading

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Fleshing Out Stuart’s ALS Node Figure 30.1


Andrew Stuart’s The Logic of Sudoku, in a chapter on Almost Locked Sets, presents an example of an ALS node in a confirming Almost Nice Loop, as Figure 30.1. This post fills in the solution, before and after the series … Continue reading

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A funster Extreme 116 Labor Day Special


An effective bypass, and a simple uniqueness rectangle, and three choices to close down funster Extreme 116 early. Charles Timmerman’s funster Extreme collection is less than  extreme, but a good introduction to advanced solving methods. The basic work is easy, … Continue reading

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Funster Extreme 102 Goes BOGO


Barely escaping the bypass, funster Extreme 102 offers a thematic example as inference chain seeing nets an extra victim for the collapse. Close to a bypass victim, Extreme 102 finishes basic quietly. On the line marked grid grid is a … Continue reading

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Early Coloring on funster Extreme 32


This post tries for a quick victory on Funx 32 with coloring, without the usual bv scan and X-panel preliminaries. That appears to flop, until three remote pair chains are connected into a long XY chain to wrap two clusters. … Continue reading

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Funster Extreme 18 Stays in the Lines


After a brutal encounter with the bypass, what’s left of funx 18 is riddled with bv. A cluster covering  half the grid expands with a trap to wrap a color and finish the puzzle. The post concludes with an update on … Continue reading

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Funster Extreme 4 has a Near BUG


The review of the Extreme section of Charles Timmerman’s Funster Hard to Extreme Sudoku is underway, with Funster Extreme 4. Funx 4 has a near BUG, but it gets to the doctor early and takes Dr. Stuart’s medicine dutifully. An … Continue reading

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