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X-Wing

Advanced

A pattern of four cells forming a rectangle that eliminates candidates.

How It Works

X-Wing is an advanced technique. When a candidate appears in exactly two cells in each of two different rows, and those cells are in the same two columns, the candidate can be eliminated from all other cells in those two columns (and vice versa for columns/rows).

Step by Step

  1. Find a candidate that appears in exactly two cells in two different rows.
  2. Check if those four cells form a rectangle (same two columns).
  3. Eliminate that candidate from all other cells in those two columns.

Practice This Technique

Try solving a puzzle and look for opportunities to apply X-Wing.

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