Play Chess vs Stockfish
Free chess against Stockfish 18, from beginner to full strength.
Promote to
Stockfish level
Takes effect from the engine's next move.
Resign this game?
Stockfish takes the win. The moves stay on the board, so you can still review them or send the game to the analyser.
Roast Mode
Stockfish roast needs to be at level 10 or better to operate effectively.
Members Only
Stockfish speaks after you move - a short summary on the current position, out loud. The tone is yours: Informative explains the position, Roast has fun at your expense - on a slider from lenient to brutal.
Stockfish Talks is available with a PlayStockfish account, and creating one takes under a minute.
Save this game
It stays in this browser, ready to pick up again on this device.
Saved games
Pick a game to put back on the board.
Checkmate
White wins.
Stockfish will provide informative commentary on game
The Rules of Chess
Everything below is the full set of rules you need to play a legal game — how the board is laid out, how each piece moves, the three moves that look like exceptions, and the ways a game can end. The diagrams use the same pieces and board colours as the game above, so whatever theme you have picked here is the one you will see when you sit down to play.
Setting up the board
Turn the board so each player has a light square in the near-right corner. The back rank runs rook, knight, bishop, queen, king, bishop, knight, rook — the queen goes on her own colour, which puts the white queen on the light square d1 and the black queen on the dark square d8. Pawns fill the rank in front.
White moves first, then the players alternate, and passing is not allowed: on your turn you must make a legal move. Every piece captures by moving onto an enemy piece's square and taking its place — the pawn is the one exception, and it is covered below.
How the pieces move
The dots on each diagram mark where that piece may go from where it stands. The queen, rook and bishop slide as far as they like along their lines, but they stop at the first piece in the way: they take an enemy piece and are blocked by a friendly one.
King
One square in any direction. He may never step onto a square an enemy piece attacks, and the two kings can never stand side by side. The king is never actually captured — losing him is what ends the game.
Queen
Any number of empty squares along a rank, a file or a diagonal — the rook and the bishop rolled into one. She is the strongest piece on the board, worth roughly two rooks.
Rook
Any number of empty squares in a straight line, along a rank or a file. Rooks come into their own on open files and on the back rank, and they are the only other piece involved in castling.
Bishop
Any number of empty squares along a diagonal. Each bishop is fixed on the colour it started on for the whole game, which is why a pair of them, covering both colours, is worth so much.
Knight
An L shape: two squares along one line, then one square across. The knight is the only piece that jumps — anything standing in between, friendly or not, simply does not matter.
Pawn
Forward one square, or two if it is still on its starting rank, and never backwards. It is the one piece that captures differently from how it moves: one square diagonally forward, marked here in red.
The three special moves
Castling
The king steps two squares towards a rook and that rook hops over to the square on his far side. It is allowed only if neither piece has moved yet, the squares between them are empty, and the king is not in check — nor passing over or landing on a square under attack.
En passant
When a pawn uses its two-square move to slip past an enemy pawn, that pawn may take it as though it had only moved one square, landing on the square behind it. The chance lasts for that one reply only, and is gone if you play something else.
Promotion
A pawn that reaches the far rank is replaced immediately by a queen, rook, bishop or knight of its own colour. Almost always a queen; a knight now and then, when it comes with check. You are not limited to the pieces you have already lost.
How a game ends
Check
The king is under attack and it must be dealt with at once: move him, take the attacker, or block the line. You may never make a move that leaves your own king in check, which is what pins pieces in place.
Checkmate
Check with no legal answer — the game is over on the spot. Here the rook covers the whole eighth rank and the black king is walled in by his own unmoved pawns, a pattern common enough to have a name: the back-rank mate.
Stalemate
Not in check, but no legal move of any kind. That is a draw, not a win. With Black to play here the king is safe where he stands, yet the queen covers all three squares he could go to — so the half point is shared.
A game is drawn in four other ways as well: by agreement between the players, by the same position appearing three times with the same side to move, by fifty moves passing with no capture and no pawn move, or when neither side has enough material to force mate — king and bishop against a lone king, for instance. Games played with a clock add one more: run out of time and you lose, unless your opponent has no way to mate you, in which case it is a draw.
Reading the move list
Moves are written in algebraic notation, the same form the move list beside the board uses and the same form you get from Copy PGN. A move names the piece and the square it lands on — and a pawn move names only the square.
Play Chess Online Against the Computer
This page is a free online chess game against Stockfish 18, the strongest chess engine ever built, compiled to WebAssembly so it runs entirely in your browser. There is nothing to download, no account to create and no limit on games. Pick your colour, pick a time control from one-minute bullet to classical, set the engine anywhere from a gentle sparring partner to full strength, and play.
Playing chess against a computer is the fastest way to get real games in at exactly the level you need. Unlike a human opponent, Stockfish is available at any hour, never tires of beginners, and never cancels — and unlike most chess sites, everything here works without signing up, on your phone as well as your desktop.
What do the skill levels mean?
The skill slider maps to Stockfish’s own Skill Level setting, from 1 to 20. The figures below are rough playing strengths in Elo terms, so you can pick an opponent near your own rating — if you do not know it, play a few games and estimate your Elo.
Tips for beating the computer
Engines punish loose tactics instantly, but at lower levels they have no plan. Keep the position closed, trade pieces when you are ahead, and never leave a piece where it can be taken for free — most games against the computer are lost to one-move blunders, not deep strategy. Use the Hint button when you are stuck and Takeback while you learn; both are there to teach.
When the game is over, press Analyze game and the whole game goes straight to the chess game analyzer, which grades every move and lets you practise the mistakes you made.
Frequently asked questions
Can I play chess against the computer for free?
Yes. Everything on this page is free, with no account, no download and no limit on games. The engine runs in your own browser, so it costs nothing to provide.
What is Stockfish?
Stockfish is the strongest open-source chess engine in the world and the tool professionals use to prepare and analyse. This page runs Stockfish 18, compiled to WebAssembly so it plays at full speed inside your browser.
What level should a beginner play?
Start at level 1–3, where the engine plays around 800–1100 strength and makes genuine mistakes you can punish. Move up a level once you win two games in a row.
Can I play with a chess clock?
Yes — bullet, blitz, rapid and classical time controls are built in, from 1+0 to 45+45, plus a custom clock and an untimed casual mode. You can browse back through the moves mid-game without pausing the clock.
Does it work on my phone?
Yes. The board, clocks and engine all run in a mobile browser — drag or tap to move, in portrait or landscape.
Can I analyze the game afterwards?
Yes. When a game ends, one press sends it to the game analysis page, where Stockfish grades every move, flags blunders and missed wins, and builds practice drills from your mistakes.
More on the site: sharpen your tactics with chess puzzles, get AI chess coaching while you play, review any finished game with the chess game analyzer, or take a Stockfish Elo estimate.