I built a chess coach that explains moves like a grandmaster instead of showing engine lines — powered by LLM

The problem I wanted to solve: Stockfish tells you what the best move is, but never why. Players under 1800 don't lose because they can't read centipawns - they lose because they don't understand plans, structures, key squares. What the tool does: Imports your games from Chess.com or Lichess Stockfish 17.1 WASM runs in your browser (fully local, nothing uploaded) A pattern detector finds 18 types of recurring mistakes across all your games (missed forks, exposed king, bad bishop, neglected development.