PenguinChess is a complete chess training platform, entirely free and accessible without creating an account. You'll find everything you need to improve your game in one place : Openings : line-by-line interactive training, including custom openings you can create yourself Tactics : unlimited puzzles filterable by theme and Elo level Endgames : theory lessons and practical training against Stockfish at variable Elo No subscription, no account required. Just chess.