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Tag Archives: naked quad
KDST 585 Favors the Bypass and Coloring
In spite of a big bypass, Krazydad Super-Tough v.5, b.8, #5 requires some work. An extensive XY railroad looks good, but a comparison with Medusa coloring favors the latter. This brings an opportunity to show unusual coloring resolutions, one involving … Continue reading
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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A Pattern Trial Defeats ultrahardcore 135
This post reports on the value pattern trial of the last post, its results, and the relatively easy march to a two cluster coloring solution of Stefan Heines ultrahardcore 135. The trial starts with the three 7 clues and naked … Continue reading
Ultrahardcore 47 Single Alternate SdC Trials
This post does the basics on the second Stefan Heine ultrahardcore right page under review. Then it shows eight ways to do the five advanced moves up to forcing chains, two of them duplicated by boomerangs. It closes by identifying … Continue reading
PencilPress Extreme 57 and Two Master Classes
Three more Basic victories are reported here with interesting traces. Looking ahead, the blog is heading toward more advanced collections, with this series being the final statement on Sysudoku Basic. Ppbr 57 starts remarkably like ppbr49. C1 makes a wall … Continue reading
A Challenging Exercise in Sysudoku Basic
This post begins a review of Will Shortz’ Hard Sudoku, v.1. The review details the solution of a pre-selected 10 puzzles from the “Beware! Very Challenging” section of that book. Nearly all Shortz puzzles reviewed in Sysudoku are solved in … Continue reading
Posted in Basic Solving Procedures
Tagged 3-fill, naked quad, Will Shortz Hard Sudoku
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Coloring Bails Out Basic on III-34
In this last post of Moito’s Sudoku Road to Mastery, Basic drives the 0.91 rated III-34 into a near BUG blind alley with a flurry of subsets and boxlines, then hands off to coloring for a quick score. A tight … Continue reading
Ardson Not So Hard Ardv2 118
Ardson Very Hard v.2 118 shows off the basic steps, but can’t quite dodge the consequences. A good Sudoku basic workout, and reminding us of the joys of basic solving. Here is the basic trace, completing box marking with a … Continue reading
Posted in Basic Solving Procedures, Puzzle Reviews
Tagged A.D. Ardson, naked quad, naked triple
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An xyt Color Wrap
In the spirit of Valentine’s Day, I come across a coloring resource in Berthier’s xyt chain. The elaboration of Royle 17-20565 in Chapter XVII of The Hidden Logic of Sudoku is a challenge in itself. By the theory of looking … Continue reading
Just One More “More Extreme”
This post concludes the Alary More Extreme review puzzles with More 144, Basic marking features a timely naked quad, and advanced solving is another parade of highlights. The basic trace classifies More Extreme 144 as a tough one. I would … Continue reading