Advanced Techniques — 32 posts
Learn what a deadly pattern means in Sudoku, how Unique Rectangle logic prevents two-solution traps, and when to practice the idea in Pure Sudoku.
Read article →Learn what BUG+1 Sudoku means, how Bivalue Universal Grave works, and how to spot the extra candidate that forces the next move.
Read article →A practical guide to the Sudoku contradiction technique, including when to use it, how to test a branch cleanly, and how it differs from guessing.
Read article →Learn the W-Wing Sudoku technique step by step, including the exact conditions, common mistakes, and how to spot safe eliminations without guessing.
Read article →Learn how a naked triple works in Sudoku, how to spot it quickly, and how to eliminate candidates without guessing.
Read article →A clear guide to bilocation Sudoku, including what the term means, how to spot it, and why it matters in chains, coloring, and advanced logic.
Read article →A practical guide to forcing chain Sudoku, including what the technique means, how to test branches safely, and how it differs from guessing.
Read article →Learn how Sudoku fish patterns work, from X-Wing to Swordfish and Jellyfish, with plain-English spotting tips, examples, and common mistakes to avoid.
Read article →A practical guide to X-Cycle Sudoku, including how to spot a valid loop, how eliminations work, and how X-Cycles differ from X-Chains and simple coloring.
Read article →A practical guide to Sudoku chain notation, including how to read strong and weak links, decode common symbols, and follow advanced chain logic without getting lost.
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