AI explains every move
Not just +1.5 — a text explanation of why a move is strong, where the mistake is, and what the position threatens.
Play. Analyze. Improve.
Play online, review games with Stockfish and AI commentary, train on your own mistakes. Free.
Puzzles from your own games
Upload a PGN — Kingside finds your mistakes and turns them into tactical puzzles. Train on the exact positions where you went wrong.
What's on Kingside
Play bots and humans across bullet, blitz, rapid, and classical — rated or casual.
Analyze games with Stockfish 18 running in your browser, plus AI commentary on every move.
Tactical, middlegame, and endgame puzzles — from the public base or generated from your own games.
Live tournament broadcasts with AI commentary on positions as they unfold.
Coaches, recorded lectures, chat, and a community of players.
Chess lectures by titled coaches
Live and recorded lectures: openings, middlegame, endgame.
Meet our coaches
Live and recorded chess lectures by our titled coaches.