Plain-English Definition
Interference places a piece on a line so a defender can no longer protect a key square, piece, or mate defense.
Why It Matters
Interference sharpens your eye for invisible defensive connections.
Common Signs in Games
- Two defenders rely on the same line.
- A blocking move comes with tempo.
- A line piece is defending from far away.
Common Mistakes
- Blocking your own best line.
- Choosing an interference square that can simply be captured.
- Missing stronger checks first.