Chess

Every rule is in: castling, en passant, promotion to any piece, and the draws — stalemate, threefold repetition, fifty moves and positions nobody can win. Play the computer at once, or send a friend a link and play on a chess clock.

Every game is played on a chess clock with two parts. Each player has a bank of time for the whole game, and every move comes with a few seconds of its own that are spent first — the bank only starts to run once they are gone, and what is left of them is not saved up. Quick, obvious moves cost you nothing.

• Classical — 30 min + 30 s. For a long, careful game where every plan gets its time.
• Rapid — 10 min + 10 s. The one a table starts with: room to think, and done over a coffee.
• Blitz — 3 min + 5 s. Fast, but with time to see a tactic coming.
• Bullet — 1 min + 2 s. A game in a couple of minutes, played on instinct.

Run your bank down to zero and you lose on time — unless your opponent has nothing left but a king, which could never mate you: then it is a draw. Against the computer, the clock stops while you are in another tab.

• Draws are called by the table as soon as they happen, not claimed — nobody has to know the rule to get the result.
• Play white, black, or let a coin decide — against the computer or at a table you open for a friend, where the colours then swap every game.
• At a table with a friend, your friend presses Ready and whoever opened the table presses Start. Either of you can offer a draw, and after a game the settings can be changed without leaving the table.
• The moves are written down as you play, in the notation any chess book uses.
• The computer plays at three strengths. Easy leaves pieces hanging for you to find; Hard thinks until its time for the move is up.