ChessEndings

Most chess players learn endgames by reading about them, then lose the same won position on the board six months later. ChessEndings makes you play the ending instead.

Every position is a drill: you get the winning (or drawing) side, and you have to convert it against an opponent that defends perfectly. The opponent is built for maximum practical resistance, so it never hands you the point the way a raw engine line does. It makes you prove the technique to the last move.

The moment you go wrong, the app tells you what happened: the win you threw away, the tempo you lost, the key square you gave up. Mistakes are classified and explained in plain language, not just marked with a "?".

When you come back to a position you already know, the board is transformed (mirrored, colors swapped) so you cannot memorize squares. You have to re-derive the plan.

What is inside:

• 318 tablebase-verified positions across 10 material families: basic mates, king and pawn, knight, bishop, bishop and knight, opposite-colored bishops, rook, rook and minor piece, queen, queen and rook.
• A structured journey from beginner mates up to expert-level queen and rook defenses, also browsable by Elo band.
• Rated endless drills (Gym) that generate fresh, tablebase-verified positions matched to your level.
• Spaced repetition, so the endings you got wrong come back at the right time.
• Illustrated guides for the named techniques: Lucena, Philidor, the opposition, key squares, the wrong bishop, and more.
• Scan your games: point the app at your online games and it finds the endgames you actually misplayed, then turns them into drills.
• An optional voice coach that talks you through the plan.
• XP, levels, streaks, achievements, and a leaderboard.

The engine runs in your browser, so there is no server round trip per move. You can play three drills a day without an account.