XYZ-Wing Sudoku Technique: How to Spot and Use It Step by Step

著者 Michel

Sudoku a Day Blog ·

XYZ-Wing は、1つのピボットセルと2つのピンサーセルを使う3セルの数独パターンです。候補数字の組み合わせが正しければ、両方のピンサーを見ているセルから共通候補を安全に消せます。

シングル、ロックされた候補、基本的なペア技法のあとに使います。難しい盤面で、1つの正確な消去が次の展開を作るときに役立ちます。

XYZ-Wing workflow

  1. Pick one digit and scan rows (or columns) only.
  2. Find exactly three rows where the candidate appears in two or three cells.
  3. Verify those candidates align to exactly three columns total.
  4. Eliminate that digit from other cells in those three columns.

Common mistakes to avoid

  • Mixing row-based and column-based XYZ-Wing scans in the same step.
  • Forcing a pattern when candidates occupy more than three lines.
  • Eliminating inside the pattern cells instead of outside them.

FAQ

When should I use XYZ-Wing in Sudoku?

Use XYZ-Wing after singles, locked candidates, and simpler pair/triple techniques are exhausted on hard or expert puzzles.

Is XYZ-Wing just a bigger X-Wing?

Yes. X-Wing uses two lines and two columns; XYZ-Wing extends the same logic to three lines and three columns.