Interference

If one piece guards another along a long line, look for a way to put a piece on that line; sometimes it is the opponent’s own king.

Remember this

If one piece guards another along a long line, look for a way to put a piece on that line; sometimes it is the opponent’s own king.

Keep going in the app

In the app, lessons continue with practice puzzles at your level, and the coach brings your own mistakes back until they stick.