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Tag Archives: Stefan Heine
An Error Hides a Lite Coloring Trap on ultrahardcore 399
This post corrects an error on the post of December 8, that prevents a lite coloring trap in ultrahardcore 399. Then there’s follow up on the trap, with the lite coloring marking in place. Trial is not avoided, but the … Continue reading
Posted in Advanced Solving, Heine, Puzzle Reviews
Tagged Lite coloring, Stefan Heine, ultrahardcore review
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Pattern Trials Peel the UHC 487 Onion
The ultrahardcore review ends, with Stefan Heine’s 487 giving up a naked single and two skyscrapers, and a jaw dropping complex 1-way, shuts down the solver team. Slicing at it with three onion peeling pattern trials leaves very little for … Continue reading
SASdC Unlock UHC 443 for Beeby
After the hidden unique rectangle hinted last week, a pair of Single Alternate Sue de Coq trials gets the review solver Beeby moving again. ALS-wings and a finned X-wing get us to a colorful finish. The hidden unique rectangle left … Continue reading
Beeby Softens Up ultrahardcore 443
This post reports a series of Beeby ALS-XZ featuring alignments in Z and X, almost to the point where a trial is needed. A simple basic trace means a hard start, with a crowded grid. Sudokuwiki’s 579-wing is a Beeby … Continue reading
Posted in Extreme Solving, Heine, Puzzle Reviews
Tagged ALS-wing, ALS_XZ, complex 1-way, dfc boomer, Stefan Heine, ultrahardcore review
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Lite Coloring Informs a UHC 399 Trial
In one post, the 10th ultrahardcore review puzzle is wrapped, but not without an introduction of something new in Systematic Sudoku. Ordinarily advanced steps begin in line marking, and lite coloring is introduced. In line marking Stefan Heine’s ultrahardcore 399, … Continue reading
An SASdC Trial Defeats ultrahardcore 355
In this post a SASdC trial plays like a regular hard puzzle from other collections. The trial amounts to adding two clues, and seeing what happens. But it isn’t guessing, and instead of making a small gain, the trial solves … Continue reading
UHC 355 Provokes a SASdC Trial
After a typical ultrahard Sysudoku Basic, Sudokuwiki starts with an APE so unusual as to change my working definition of the APE. APE stands for Aligned Pair Elimination. From every example so far, I thought it was the two elimination … Continue reading
Posted in Extreme Solving, Heine, Puzzle Reviews
Tagged ALS node, ALS wings, APE, freeform pattern analysis, Stefan Heine, toxic orphan, ultrahardcore review
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A Coloring Trial Weakens ultrahardcore 311
Sorry about last week’s post arriving a week earlly. This week continues the solving of Stefan Heine’s ultrahardcore 311 with a coloring trial, and an enabled Beeby marching to the solution. Here is the trial grid, after the removal of … Continue reading
Posted in Extreme Solving, Heine
Tagged ALS 1-way, ALS_XZ, coloring trial, hidden rectangles, naked quad, Stefan Heine, ultrahardcore review
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All Hands on Deck Against UHC 311
This post gets us into coloring and and a look at the Beeby ALS-wing with an ALS_XZ map. Also the solvers illustrate a new pattern analysis resource. Picking up from last post, Beeby now comes in with a complex 1-way. … Continue reading
Posted in Extreme Solving, Heine, Puzzle Reviews
Tagged complex 1-way, Stefan Heine, toxic orphan, ultrahardcore review
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A Long Path Begins in ultrahardcore 311
This post begins a series of three, reporting moves by the human oriented review solvers Sudokuwiki and Beeby on Stefan Heine’s UHC 311. Maybe you can shortcut this long path and a trial, but it allows me to illustrate human … Continue reading
