Chessagine

If you're building chess tools or AI assistants that need real position analysis, this connects you to Stockfish, Leela Chess Zero, and Maia engines for evaluation. It pulls games, puzzles, and opening stats from Lichess, plus access to specialized databases like ChessDB and chessboardmagic for correspondence and TCEC games. You get board rendering and PGN visualization tools built in, plus utilities for move validation and FEN manipulation. The usage data shows heavy use of Lichess game fetching and puzzle retrieval, with engine analysis calls spread across different strength levels. Reach for this when you need chess intelligence beyond basic move generation, whether you're building a training app, game reviewer, or conversational chess coach.