Play
Who do you want to play?
People at any time control, legends of chess history, or Stockfish for a few moves from any position. Every game opens in Analysis afterwards, and counts towards your skills once Stockfish has read it on your device.
Play it out against Stockfish
Take any position and play a few moves for the side to move against Stockfish. At the end, Stockfish judges how much of your advantage you kept (or how well you held a worse position). The first play-out from a position counts towards your conversion and defence ratings.
Black to move
Start: The position you came from
Your moves (Stockfish answers each one). At most five keeps every play-out quick.
Default 12: strong and quick. Higher is stronger and slower on a phone.