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Tag Archives: iXYZ-wing
Reviewing James Forest’s Classic Sudoku
This post presents a Sysudoku solution of the Classic 24, from James Forest’s Book 30. We’ll do every 24th Classic. The first suggests an easy basic and an interesting diversity of advanced methods. The bypass fills the East boxes with … Continue reading
Posted in Advanced Solving, Puzzle Reviews
Tagged finned swordfish, Forest Classic, irregular XYZ, iXYZ-wing, UR type 2b
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A funster Extreme 116 Labor Day Special
An effective bypass, and a simple uniqueness rectangle, and three choices to close down funster Extreme 116 early. Charles Timmerman’s funster Extreme collection is less than extreme, but a good introduction to advanced solving methods. The basic work is easy, … Continue reading
Pattern Coloring Not-Both on Only Extreme 261
On this post of the Manuel Castillo Only Extreme review, Only Extreme 261 justifies its “extreme” label. After limited advanced moves, a pattern based coloring suggests an extension via a not-both trial on a long AIC strong link. The not-both … Continue reading
Almost Extreme 175 Tags Five Advanced Bases
This post reaches the halfway point in the review of Manuel Castillo’s Only Extreme collection, with Only Extreme 175. A double UR, a regular Sue de Coq and irregular XYZ-wing prepare the bv field for coloring, and an XY chain … Continue reading
No THLS Case for Hidden XY Chains
This post and the next demonstrate that the examples presented in The Hidden Logic of Sudoku as requiring “Hidden” XY Chains actually have alternative, and much less demanding, resolution paths in the Sysudoku repertoire. The burdensome maintenance of symmetry grids is … Continue reading
Mike Peterson’s Very Hard Sudoku, v.1
Resuming posts after a quiet summer, this review identifies the title book as a basic level collection, offering an interesting challenge for the slink marking bypass, and little else. The brief introduction offers interesting historical facts, but is another example … Continue reading
Posted in Advanced Solving, Basic Solving Procedures, Puzzle Reviews
Tagged iXYZ-wing, Mike Peterson, Very Hard Sudoku, XY-chain
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The Nastiest Ever Party II
This post displays some sysudokie snapshots from Nastiest 618, 640 and 651, The bv scan rules, with line marked fish, unique rectangles, Sue de Coq, XYZ-wings, and XY-chains. A Sysudoku technique formerly rated extreme gets to stop for a drink. … Continue reading
Posted in Advanced Solving, Longo, Puzzle Reviews
Tagged Frank Longo, iXYZ-wing, Nastiest Sudoku Ever, Sudoku bv scan, Sudoku coloring, Sudoku Sue de Coq, sue-de-coq, UR, XY rail, XYZ-wing
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