Chess where AI explains every move

Play online, review games with Stockfish and AI commentary, train on your own mistakes. Free.

Not just +1.5 — a text explanation of why a move is strong, where the mistake is, and what the position threatens.

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.