# Tag Archives: forcing chains

## Decoding Hodoku Chain Notes

This post comments on the first part of the Hodoku “Chains and Loops” page. It reveals the premise dependent view of chains to be based on computer coding, and unsuited for human solving advice. It explains Hodoku’s chain notations as … Continue reading

## Hodoku Unique Rectangles

This post lists the Hodoku UR techniques in a convenient reference sheet, and illustrates many of the examples in a more explicit Sysudoku format. I review Sysudoku principles for UR exploitation, and call attention to the Hodoku omission of forcing … Continue reading

## Hanson’s Polarity ANL

This post reviews the section of Bob Hanson’s Sudoku Assistant report titled Almost- Locked Ranges. It presents an effective solving idea, but with hazy definitions and a confusing name. Here I identify this idea as a familiar one in the … Continue reading

## Pitkow’s Grand Master Sudoku

This is a short review of the GM section of Sudoku vol. 3 , by Xaq Pitkow, published by Chronicle Books.  The puzzles vary between basic and moderately advanced levels I pre-selected 10 GM and 25 Super GM puzzles for … Continue reading

## Paul Stephens’ Extremes Review

Here we review as one collection the “extreme” puzzles in Paul Stephens’  two current books, Mastering Sudoku Week by Week and The Sudoku Addict’s Workbook. In Stephens’ Weeks, puzzles for weeks 26 through 52 are labeled “Extreme”.  By this, Paul … Continue reading

## A Bv Scan of Week 48

Here we checkpoint the sysudoku bv scan on the blog homework puzzle, Week 48 in Paul Stephens’ Mastering Sudoku Week By Week.  The scan includes Sue de Coq and APE, two techniques ignored by Stephens’ books, and two techniques, XYZ-wings … Continue reading

## Absolutely Nasty 4 Review Snaps I

Here we link back to advanced solving posts as we enjoy sysudokie solving snapshots from the review table puzzles 0f Frank Longo’s Absoutely Nasty Level 4 (AN4) collection.  Did you ever get trapped looking at a neighbor’s vacation slides ?  You … Continue reading

## Forcing Chains in Sue de Coq Analysis

In this post, the classical forcing chain and a sysudokie endorsed application are demonstrated on a multiple solution puzzle. An underlying assumption made in solving a Sudoku puzzle is that it has one and only one solution.  Some composers offer … Continue reading