# Category Archives: Basic Solving Procedures

Starting with slink marking to find all remaining candidates.

## Closing With the Hidden Dublex

This closing post adds two examples of a fierce looking line marking being de-fanged by hidden dublex on the over abundant X values A double line exclusion, or dublex, is one of the primary moves of Basic sudoku, in which … Continue reading

## Bring Your Boxline for Extreme Hard 1505

I was closing down the weekly posts with a set of scroll down basic level puzzles, when I got another collection book , 3000 more “very hard to extreme “, for Adult puzzles. I did a few from the extreme … Continue reading

## A Filling USA Today Weekend 5-Star

Starting with a 2-fill, two 3-fills, and a 4-fill near collapse, there’s value by value action left in the bypass for only one value. Scroll back for the givens and trace out the bypass. An x-fill lists the values to … Continue reading

## A Kampelmann Hard With Bypass Coloring

Ever have a Sudoku fail to tie down a solution? Hard 109 of last post seems to fail to do so without a trial. Coloring, which has found many multiple solutions, defines the unique solution for this one. Starting with … Continue reading

## A Washington Post ****** Basic

Scroll back one for the reason for the change in plans, but this is the first of several weekend puzzles from the Washington Post, added at the last minute for additional illustrations of Sysudoku Basic solving.   Basic starts with … Continue reading

## A Hard, But Bypassed Kampbelmann 50

My Basic bypass starts with a resolved 4-fill. Did yours?  The final collapse begins with the value 8 scan resolving the naked pair left from the resolution of 3-fill c2[258]. In the bypass trace, you can discover when the previous … Continue reading

## Box Marking Subsets Maintain a CREATORS Collapse

Sysudoku weekly posts will soon be ending. This post may be the last one from the Akron Beacon Journal CREATORS series. In this one, Sysudoku box marking rescues us from a very stingy bypass, in ABJ Creators of 4/20/22. The … Continue reading Continue reading

## An ABJ Bronze With Many 4-Fill Bypass Traces

This post demonstrates the type of bypass you get by following up every resolvable 4-fill as it appears, in a less difficult puzzle. Bronze is the least difficult level announced by ABJ Creators. A similar solution path is started on … Continue reading

## Backing up to a 5-fill

Here is the Akron Beacon Journal CREATORS of 3/30/22 at the end of tracing the follow up of a 5-fill. Scanning for 5-fills is not productive. Too many, and they almost always fail. But this time, 4 of the 5 … Continue reading