Four tools, no signup
An analysis board, a best move finder, a position editor and an Elo calculator. All free, nothing to install, and the three board tools run Stockfish 18 in your browser.
Analysis Board
Stockfish reading over your shoulder as you push the pieces. Live eval, the best three lines, and a move list that follows you.
Live enginePaste FEN or PGNTop 3 lines Open the board
Best Move Finder
One question, one answer. Paste a position and get the move to play, the line behind it, and the near-misses.
Instant answerRunner-up movesStockfish 18 Find the movePosition Editor
Build any position by tapping a piece then a square. Set the turn and castling, and send it to the board or the engine.
Tap to placeTells you what is illegalExports FEN Start building
Elo Calculator
What a win, draw or loss does to your rating against any opponent, and how many games a target rating takes.
Any K-factorWin, draw, lossTarget planner Work it out