やっと解けた！過去に出来なかった難問を解き明かす『ナンプレ上級テクニック』XYチェーン

This video introduces how to solve Sudoku puzzles (tips for solving number puzzles). This time, we'll explain the extreme (top-level) technique, XY-Chain. We'll revisit a problem that we previously gave up on solving using a logical approach. With these Sudoku techniques, even extremely difficult Sudoku puzzles can be solved! This chain technique uses weak and strong links to eliminate candidate numbers from blocks by connecting links of different numbers. Unlike finding X-Wings and Y-Wings, this is an advanced solving technique that connects squares with two limited candidates. We aim to provide an easy-to-understand explanation for beginners and intermediate players by solving it slowly. Recommended Number Place/Sudoku app: Advanced chain logic Puzzle used: THE Number Puzzle (Nintendo Switch) No. 80 "Sudoku" is a registered trademark of Nikoli Co., Ltd.