Ready to put the Finned X-Wing into action? This page is designed for you to practice and master Finned X-Wing with positions from real Sudoku puzzles.
Every board above is a position from a real puzzle where the Finned X-Wing is the next step. Tap the candidates it removes (or select a cell and press the digit) and press Check. If you’re stuck, Show me gives the answer and Next puzzle loads another. Want to watch one first? Switch to Worked example.
Quick Reminder: What is a Finned X-Wing?
A Finned X-Wing is an X-Wing with one or two extra places for the digit (the fin) in one of its rows, all in one box. Either the X-Wing holds or the fin is true. So the only cells that can lose the digit are those that are in the X-Wing’s columns and also in the fin’s box.
Want a full step-by-step guide? Read the Finned X-Wing technique article
How to Practice
- Look for an X-Wing on one digit where one row has an extra place or two, all in the same box as one corner.
- Remove the digit only from cells in the X-Wing’s columns that also sit in the fin’s box.
- On the board, tap each of those candidates to remove it.
- Press Check. On your first try you see how many you found; on the second, the ones you missed get a dashed ring.
Start Practicing on Full Puzzles
Once you can find the Finned X-Wing on most boards without pressing Show me, take it into a full game. Evil puzzles are where this technique starts to come up, and the step-by-step solver will name the technique each time you get stuck.