Tag Archives: 3-fill

Naked Pairs Carry the Ball in Hard 134

Posted on May 24, 2022 by Sudent

A second Kampbelmann Hard is tough on paper, but  gives way routinely to a systematic bypass. Here is the grid well into the bypass, with a large number of cells held in reserve by box filling naked pairs. In the … Continue reading →

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Systematic FTSPAH 44 and 84

Posted on October 22, 2019 by Sudent

This post demonstrates two more FTSPAH unlikely to frustrate anyone following the Sysudoku order of battle. FTSPAH 44 begins with an unusually large number of givens, which generates a correspondingly large number of 3-fills. In fact, the givens offer both … Continue reading →

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The FTSPAH Review Begins With a Tour

Posted on October 15, 2019 by Sudent

Here I report on 4 and 24, the first two of 10 puzzles selected for the Sysudoku review of the FTSPAH puzzle book. Starting grids were displayed at the end of last week’s post.   I also explain a few things … Continue reading →

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PencilPress Extreme 57 and Two Master Classes

Posted on September 3, 2019 by Sudent

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 →

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Chute Filling Beware 115

Posted on October 9, 2018 by Sudent

The second selection for the review of Will Shortz’ Hard Sudoku v.1 is Beware! Very Challenging 115. After a checkpoint on the Sysudoku Basic solution path, there is a brief report on the Guide’s Pattern Analysis page, now published in … Continue reading →

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A Challenging Exercise in Sysudoku Basic

Posted on October 2, 2018 by Sudent

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 →

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Funster Extreme 18 Stays in the Lines

Posted on July 24, 2018 by Sudent

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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The Bypass 3-Fill Smacks Diabolical 350

Posted on February 13, 2018 by Sudent

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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