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Playing online
Online games are correspondence games with anyone on your Nextcloud: you move when it suits you, and notifications tell you when it is your turn.
On Home, choose Online, then:
- Invite someone: search for anyone you can find in Nextcloud's user search. They get a notification with Accept and Decline.
- Open a challenge: anyone who may play online can join it. Open challenges show on Home for everybody.
Choose the time per move: 1, 3 or 7 days (3 by default), or no deadline for an unrated game, and whether the game is rated. In rated games the colours are assigned at random.
Invitations and open challenges expire after a while (14 and 7 days by default) when nobody answers.
- Chat with your opponent, with quick phrases.
- Offer a draw, or resign at any time; the game asks before you resign.
- Rematch when the game is over.
- Moves show up on the other player's screen within seconds. When the Nextcloud app Client Push (notify_push) is installed, they show at once.
When the time for a move runs out, the late player loses. It is a draw if the opponent has only a king left, and the game is cancelled if the late player had not moved yet.
You get a notification for invitations, your turn, draw offers, results and chat, in the web interface and in the Nextcloud mobile and desktop clients, with actions such as Accept, Decline and Rematch. While a game is open in a visible tab, you get no notification of your turn or of chat in that game. Each kind can be switched off in Personal settings → Quantum Chess, and chat previews can be hidden.
- Ratings use Elo, starting at 1200. Your first 10 rated games count double (the rating shows as provisional).
- Every two-player chess variant has a rating and a leaderboard of its own.
- Games against the computer, against an AI opponent, and pass & play never change your rating.
- The leaderboard is under Statistics. Whether you appear on it depends on your administrator's setting (off, opt-in or opt-out) and your own choice.
In your own online games that are still running, the coach, hints, the evaluation bar and the analysis are switched off. They come back when the game ends. The king-danger ring stays, because it is rule information.
Every online roll is drawn by the server when the move is applied, stored with its odds and chained to the previous move. Your app checks the chain and warns you if the history of a game you have seen was changed later.
Every chess variant can be played online too, including Four-player chess and Bughouse with four players, and Kriegspiel and Fog of war, where the server is the umpire and shows each player only their own view. See Chess variants.