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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
Posted in Expert Reviews, Hobiger
Tagged AIC, Bernhard Hobiger, forcing chains, Hodoku, irregualr XYZ-wing, XY-wing
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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
Posted in Expert Reviews, Hobiger
Tagged avoidable UR, forcing chains, Hodoku, UR, UR Types
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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
Posted in Advanced Solving, Expert Reviews, Hanson
Tagged almost locked range, Bob Hanson, ER, forcing chains, Polarity ANL, Sudoku Assistant
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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
Posted in Advanced Solving, Pitkow, Puzzle Reviews
Tagged APE, forcing chains, line marking X-wing, Xaq Pitgow
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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
Posted in Advanced Solving, Puzzle Reviews
Tagged almost nice loops, ANL test, color trap, forcing chains
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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
Posted in Advanced Solving, Puzzle Reviews, Sudoku Toolware
Tagged avoidable UR, bv map, forcing chains, Paul Stephens, sue-de-coq, X-wing, XYZ map
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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
Posted in Advanced Solving, Puzzle Reviews
Tagged AIC almost nice loops, ALS, ALS aided AIC, APE, bi-value map, finned fish, forcing chains, kraken fish, nice loops, X-chains, XY-chain
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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
Posted in Advanced Solving
Tagged ER, forcing chains, sue-de-coq, uniqueness methods
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Unit Forcing Chains
Here I explain why sysudokies pass on Andrew Stuart’s Dual Unit Forcing Chains. We also examine a triple unit forcing chain from Unsolvable 40. As of this post, this statement continues to appear in Andrew’s sudowiki.org introduction to Unit Forcing … Continue reading
ALS Merged Cell Forcing Chains
This post demonstrates the merger of cell forcing chains by means of ALS nodes. I checkpoint three triple cell forcing chains from the challenge of the previous post, and argue that comprehensive search for cell forcing chains beyond the dual level … Continue reading