Free chess analysis board with Stockfish

Analyse any position or game with Stockfish running entirely in your browser: nothing is uploaded.

Several engines: Stockfish 10, 11, 17, 18 and 19, and Lozza.
Several best lines at once, with evaluation, depth and speed.
Opening names from the Lichess openings database, and alerts when a known trap is on the board.
Exact results from the endgame tablebase for positions with 7 pieces or fewer.
Import games as PGN or positions as FEN, set up positions, save boards, and export or download.