Tag Archives: A.D. Ardson

The Bypass 3-Fill Smacks Diabolical 350


This post starts with a trace of the merciless 3-fill pounding of Ardson’s Sudoku Diabolical 350 in the bypass. Highlight grids from adv2 110 and 190 then follow. The 3-fill brings on the unit fill phase of basic solving, when … Continue reading

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Closing Very Hard v.2 with the Real 38


To be fair, here is my do over of the real Ardv2 38, the one with a given 7 in r7c6.  My omission of it hatched a productive distraction, having no bearing on the collection it came from. The basic … Continue reading

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A Very Hard Finale with Ardv2 398


A hard basic leaves it to an unusual ALS to shake things loose, enabling an XY and a UR to wrap it up.  Maybe the hardest of the pre-selected Very Hard.   Line marking looks easy, until you look at … Continue reading

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A Little Harder Ardson v2. 358


Next to last, and getting beyond the XY railway, is A.D. Ardson Very Hard, v.2 358. Here is the basic trace, including an X-wing in the close of line marking. The column 6-wing  was found in line marking closure, when … Continue reading

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Ardson Very Hard v.2 318


The review continues the pattern with Ardv2 318. Ignore the pencil marks and pick out the givens if you have to, but try the bypass.  It gets close to the edge, leaving three 3-fill lines for box marking.     … Continue reading

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Ardson Very Hard v.2 278, Plus 38 Comments


A conversation about multiple solution puzzles and coloring may be developing, as the A.D. Ardson review plods on.  On Ardv2 278, hidden pairs (naked triples) compensate for a weak bypass.  The puzzle falls to yet another XY chain. Two regulars … Continue reading

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Ardson Very Hard v.2 198 and 238


The review of A.D. Ardson Very Hard Puzzles v.2 continues with Ardv2 198 and 238. The sysudokie resolution to 198 is a rerun of 158, but 238 is a classic remote pair example. Ardv2 198 barely escapes the bypass, but … Continue reading

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