Quantum Chess - Releases

Maintenance release.

The chess variants go online.

Added

• Online play for the two-player chess variants: 3D, 4D and 5D chess, Tri-Dimensional chess, Chess960, Atomic, Crazyhouse, Antichess, King of the Hill, Three-check, Horde, Hexagonal chess, Capablanca chess, Shogi, Xiangqi and Makruk. Choose Online as the opponent in a variant's New game dialog and invite someone or open a challenge. The server draws the dice of every move; both players' devices check every move against the rules, and if they ever disagree, the game is annulled. Online variant games are not rated.
• Four-player chess and Bughouse online: choose a player for every seat, or leave seats open for anyone to join, optionally with random seats. Each invited player answers on their own, and the game starts when every seat is taken. Resigning or running out of time ends the game for everyone (the other team wins, or the others share the win); a draw needs every player.
• Kriegspiel and Fog of war online, with the server as the umpire: it keeps the whole board, decides every move and sends each player only what they may see. In Kriegspiel a move the umpire refuses uses no turn and is not told to your opponent; in Fog of war you see the odds of a move before you confirm it. The whole board and every move are shown when the game ends. With this, all twenty chess variants can be played online.

Maintenance release, and the first step towards playing the chess variants online, four-player games included.

Changed

• The database gets the tables that online games of the chess variants will use. Nothing uses them yet: the variants are still played on your own device, and online games of classic Quantum Chess are unchanged.
• Updated the Nextcloud components of the app.

Quantum Chess 2: twenty chess variants with the quantum element of the classic game, led by 5D chess with multiverse time travel. The variants are played on your own device; online play, ratings and the rules engine of classic Quantum Chess are unchanged.

Added

• Multiverse chess (5D), the quantum version of 5D Chess With Multiverse Time Travel: timelines as rows and time as columns; pieces that travel back in time and to other timelines, where a move onto an older board opens a new timeline (up to three per player, or four on a laptop: an option); turns with a move on every must-move board of the present, ended by Submit turn; every official piece (unicorn, dragon, princess, brawn, common king and royal queen) and 44 official start positions, Small (5 × 5) by default. Boards are certain and pieces are quantum: ghosts, twins and links on every board, the past included. A turn that cannot be finished ends the game as checkmate or stalemate, and a move that would strand your own turn asks first.
• Nineteen more chess variants, grouped as in the app:
• Other dimensions: 3D chess (Raumschach), Tri-Dimensional chess with movable attack boards and 4D chess.
• Hidden information: Kriegspiel and Fog of war.
• Different rules: Chess960, Atomic, Crazyhouse, Bughouse, Antichess, King of the Hill, Three-check and Horde.
• Different boards and more players: Hexagonal chess, Four-player chess and Capablanca chess.
• Regional relatives: Shogi, Xiangqi and Makruk.
• The quantum rules on every board: split, merge, Measure and ordinary moves; "land = roll, pass = link", drops included; kings, pawns and the pieces a variant names always solid; castling and en passant only when they are certain; a roll whenever the game would end in some possibilities but not in others; a budget of 8 arrangements per side.
• The classic end rules in the two-player variants with a king and one move per turn: capture the king instead of check, "your king cannot escape", and the bare-kings and 50-move draws, which wait while a king can be captured for certain; a variant with its own goal keeps it.
• Computer player for every variant with three levels (Easy, Normal and Hard), running in your browser and keeping the board responsive while it thinks. It plays the quantum moves too: splits that fork, dodge or block, merges that capture and measurements that settle a danger. In the hidden-information variants it sees only what its own side may see.
• Pass & play for two players, or four in Bughouse and Four-player chess, on one device; against the computer you take one seat and the computer plays all the others. In Kriegspiel and Fog of war each player sees only their own view: a hand-over screen covers the board between turns, and the whole board is revealed when the game ends.
• Variant screens: Chess variants in the navigation and on the home page, with the catalogue by category and your games on this device; a New game dialog for the opponent, level, side and the variant's options; a game screen for any board shape with the variant's rules next to the shared quantum rules, pieces in hand, the odds of every roll before you confirm, a numbered move list, and undo that never rolls a result again.
• Phones and tablets: large boards zoom with the buttons, a pinch or Ctrl + wheel and pan with a finger; 4D chess, Bughouse and 5D chess open on the boards you play, and the move controls stay at the bottom of the screen.
• Languages: the variants are in English, Dutch, German and French, like the rest of the app.

Changed

• The App Store page is in English only. The app itself is still in English, Dutch, German and French.

Maintenance release.

Maintenance release.

The first release: chess with superposition, measurement and entanglement, inside Nextcloud.

Added

• Rules version 1: split, merge, Measure and ordinary moves; "land = roll, pass = link"; kings and pawns always solid; a budget of 8 arrangements per side; capture the king to win, including the "king cannot escape" rule; draws by agreement, bare kings, threefold repetition, the 50-move rule, no legal move and the move limit. Identical JavaScript and PHP rules engines, checked against shared test fixtures.
• Game screen: ghosts with exact percentages, part threads and link glyphs, the what-if view, the king-danger ring and the king safety net, budget pips and the possibilities count, a move preview with the odds of every result, the roll animation with a plain-language explanation, a move list and roll log; click, drag and keyboard input; three board themes (Classic, Blue, Quantum), the cburnett pieces and synthesised sound.
• Online correspondence games with other users: invitations and open challenges, 1, 3 or 7 days per move, draw offers, resignation, abort, rematch, chat with quick phrases and mute, Elo ratings with a provisional period and an opt-in leaderboard, recent games on the home page.
• Fair online play: rolls drawn by the server when a move is applied and recorded in a hash chain, a check in every client with a warning when history was altered, and the coach switched off in your own running online games.
• Computer player with five levels, from Wobbles to The Observer, running in the browser.
• AI opponents with four personalities (Professor Qubit, Captain Collapse, Madame Superposa, Q-7) through Nextcloud AI (TaskProcessing), an organisation provider or a personal API key (OpenAI-compatible services and Anthropic), with the built-in computer player as a fallback.
• Pass & play on one device, with player names and optional automatic board flipping.
• Trainer: eleven interactive lessons and eleven puzzles, all verified against the real rules engine by the test suite.
• Coach and review: evaluation bar, hints, threat warnings and move-quality badges; an AI coach for questions about the position; a post-game review with an evaluation graph and key moments.
• Nextcloud integration: notifications with Accept, Decline and Rematch actions for the web, mobile and desktop clients; a dashboard widget; navigation and tab-title counters; light, dark and high-contrast themes.
• Settings: in-app settings for the board, quantum display, moves, animation, sound and coach; personal settings for online play, notifications and AI; admin settings for multiplayer, the leaderboard, AI sources, local AI servers and limits.
• Privacy and security: encrypted API keys that never reach the browser, protection against requests to internal addresses, rate limits, a first-use notice before any AI request, and clean-up when an account is deleted.
• Languages: English, Dutch, German and French.

Maintenance release.

The chess variants go online.

Added

• Online play for the two-player chess variants: 3D, 4D and 5D chess, Tri-Dimensional chess, Chess960, Atomic, Crazyhouse, Antichess, King of the Hill, Three-check, Horde, Hexagonal chess, Capablanca chess, Shogi, Xiangqi and Makruk. Choose Online as the opponent in a variant's New game dialog and invite someone or open a challenge. The server draws the dice of every move; both players' devices check every move against the rules, and if they ever disagree, the game is annulled. Online variant games are not rated.
• Four-player chess and Bughouse online: choose a player for every seat, or leave seats open for anyone to join, optionally with random seats. Each invited player answers on their own, and the game starts when every seat is taken. Resigning or running out of time ends the game for everyone (the other team wins, or the others share the win); a draw needs every player.
• Kriegspiel and Fog of war online, with the server as the umpire: it keeps the whole board, decides every move and sends each player only what they may see. In Kriegspiel a move the umpire refuses uses no turn and is not told to your opponent; in Fog of war you see the odds of a move before you confirm it. The whole board and every move are shown when the game ends. With this, all twenty chess variants can be played online.

Maintenance release, and the first step towards playing the chess variants online, four-player games included.

Changed

• The database gets the tables that online games of the chess variants will use. Nothing uses them yet: the variants are still played on your own device, and online games of classic Quantum Chess are unchanged.
• Updated the Nextcloud components of the app.

Quantum Chess 2: twenty chess variants with the quantum element of the classic game, led by 5D chess with multiverse time travel. The variants are played on your own device; online play, ratings and the rules engine of classic Quantum Chess are unchanged.

Added

• Multiverse chess (5D), the quantum version of 5D Chess With Multiverse Time Travel: timelines as rows and time as columns; pieces that travel back in time and to other timelines, where a move onto an older board opens a new timeline (up to three per player, or four on a laptop: an option); turns with a move on every must-move board of the present, ended by Submit turn; every official piece (unicorn, dragon, princess, brawn, common king and royal queen) and 44 official start positions, Small (5 × 5) by default. Boards are certain and pieces are quantum: ghosts, twins and links on every board, the past included. A turn that cannot be finished ends the game as checkmate or stalemate, and a move that would strand your own turn asks first.
• Nineteen more chess variants, grouped as in the app:
• Other dimensions: 3D chess (Raumschach), Tri-Dimensional chess with movable attack boards and 4D chess.
• Hidden information: Kriegspiel and Fog of war.
• Different rules: Chess960, Atomic, Crazyhouse, Bughouse, Antichess, King of the Hill, Three-check and Horde.
• Different boards and more players: Hexagonal chess, Four-player chess and Capablanca chess.
• Regional relatives: Shogi, Xiangqi and Makruk.
• The quantum rules on every board: split, merge, Measure and ordinary moves; "land = roll, pass = link", drops included; kings, pawns and the pieces a variant names always solid; castling and en passant only when they are certain; a roll whenever the game would end in some possibilities but not in others; a budget of 8 arrangements per side.
• The classic end rules in the two-player variants with a king and one move per turn: capture the king instead of check, "your king cannot escape", and the bare-kings and 50-move draws, which wait while a king can be captured for certain; a variant with its own goal keeps it.
• Computer player for every variant with three levels (Easy, Normal and Hard), running in your browser and keeping the board responsive while it thinks. It plays the quantum moves too: splits that fork, dodge or block, merges that capture and measurements that settle a danger. In the hidden-information variants it sees only what its own side may see.
• Pass & play for two players, or four in Bughouse and Four-player chess, on one device; against the computer you take one seat and the computer plays all the others. In Kriegspiel and Fog of war each player sees only their own view: a hand-over screen covers the board between turns, and the whole board is revealed when the game ends.
• Variant screens: Chess variants in the navigation and on the home page, with the catalogue by category and your games on this device; a New game dialog for the opponent, level, side and the variant's options; a game screen for any board shape with the variant's rules next to the shared quantum rules, pieces in hand, the odds of every roll before you confirm, a numbered move list, and undo that never rolls a result again.
• Phones and tablets: large boards zoom with the buttons, a pinch or Ctrl + wheel and pan with a finger; 4D chess, Bughouse and 5D chess open on the boards you play, and the move controls stay at the bottom of the screen.
• Languages: the variants are in English, Dutch, German and French, like the rest of the app.

Changed

• The App Store page is in English only. The app itself is still in English, Dutch, German and French.

Maintenance release.

Maintenance release.

The first release: chess with superposition, measurement and entanglement, inside Nextcloud.

Added

• Rules version 1: split, merge, Measure and ordinary moves; "land = roll, pass = link"; kings and pawns always solid; a budget of 8 arrangements per side; capture the king to win, including the "king cannot escape" rule; draws by agreement, bare kings, threefold repetition, the 50-move rule, no legal move and the move limit. Identical JavaScript and PHP rules engines, checked against shared test fixtures.
• Game screen: ghosts with exact percentages, part threads and link glyphs, the what-if view, the king-danger ring and the king safety net, budget pips and the possibilities count, a move preview with the odds of every result, the roll animation with a plain-language explanation, a move list and roll log; click, drag and keyboard input; three board themes (Classic, Blue, Quantum), the cburnett pieces and synthesised sound.
• Online correspondence games with other users: invitations and open challenges, 1, 3 or 7 days per move, draw offers, resignation, abort, rematch, chat with quick phrases and mute, Elo ratings with a provisional period and an opt-in leaderboard, recent games on the home page.
• Fair online play: rolls drawn by the server when a move is applied and recorded in a hash chain, a check in every client with a warning when history was altered, and the coach switched off in your own running online games.
• Computer player with five levels, from Wobbles to The Observer, running in the browser.
• AI opponents with four personalities (Professor Qubit, Captain Collapse, Madame Superposa, Q-7) through Nextcloud AI (TaskProcessing), an organisation provider or a personal API key (OpenAI-compatible services and Anthropic), with the built-in computer player as a fallback.
• Pass & play on one device, with player names and optional automatic board flipping.
• Trainer: eleven interactive lessons and eleven puzzles, all verified against the real rules engine by the test suite.
• Coach and review: evaluation bar, hints, threat warnings and move-quality badges; an AI coach for questions about the position; a post-game review with an evaluation graph and key moments.
• Nextcloud integration: notifications with Accept, Decline and Rematch actions for the web, mobile and desktop clients; a dashboard widget; navigation and tab-title counters; light, dark and high-contrast themes.
• Settings: in-app settings for the board, quantum display, moves, animation, sound and coach; personal settings for online play, notifications and AI; admin settings for multiplayer, the leaderboard, AI sources, local AI servers and limits.
• Privacy and security: encrypted API keys that never reach the browser, protection against requests to internal addresses, rate limits, a first-use notice before any AI request, and clean-up when an account is deleted.
• Languages: English, Dutch, German and French.

Maintenance release.

The chess variants go online.

Added

• Online play for the two-player chess variants: 3D, 4D and 5D chess, Tri-Dimensional chess, Chess960, Atomic, Crazyhouse, Antichess, King of the Hill, Three-check, Horde, Hexagonal chess, Capablanca chess, Shogi, Xiangqi and Makruk. Choose Online as the opponent in a variant's New game dialog and invite someone or open a challenge. The server draws the dice of every move; both players' devices check every move against the rules, and if they ever disagree, the game is annulled. Online variant games are not rated.
• Four-player chess and Bughouse online: choose a player for every seat, or leave seats open for anyone to join, optionally with random seats. Each invited player answers on their own, and the game starts when every seat is taken. Resigning or running out of time ends the game for everyone (the other team wins, or the others share the win); a draw needs every player.
• Kriegspiel and Fog of war online, with the server as the umpire: it keeps the whole board, decides every move and sends each player only what they may see. In Kriegspiel a move the umpire refuses uses no turn and is not told to your opponent; in Fog of war you see the odds of a move before you confirm it. The whole board and every move are shown when the game ends. With this, all twenty chess variants can be played online.

Maintenance release, and the first step towards playing the chess variants online, four-player games included.

Changed

• The database gets the tables that online games of the chess variants will use. Nothing uses them yet: the variants are still played on your own device, and online games of classic Quantum Chess are unchanged.
• Updated the Nextcloud components of the app.

Quantum Chess 2: twenty chess variants with the quantum element of the classic game, led by 5D chess with multiverse time travel. The variants are played on your own device; online play, ratings and the rules engine of classic Quantum Chess are unchanged.

Added

• Multiverse chess (5D), the quantum version of 5D Chess With Multiverse Time Travel: timelines as rows and time as columns; pieces that travel back in time and to other timelines, where a move onto an older board opens a new timeline (up to three per player, or four on a laptop: an option); turns with a move on every must-move board of the present, ended by Submit turn; every official piece (unicorn, dragon, princess, brawn, common king and royal queen) and 44 official start positions, Small (5 × 5) by default. Boards are certain and pieces are quantum: ghosts, twins and links on every board, the past included. A turn that cannot be finished ends the game as checkmate or stalemate, and a move that would strand your own turn asks first.
• Nineteen more chess variants, grouped as in the app:
• Other dimensions: 3D chess (Raumschach), Tri-Dimensional chess with movable attack boards and 4D chess.
• Hidden information: Kriegspiel and Fog of war.
• Different rules: Chess960, Atomic, Crazyhouse, Bughouse, Antichess, King of the Hill, Three-check and Horde.
• Different boards and more players: Hexagonal chess, Four-player chess and Capablanca chess.
• Regional relatives: Shogi, Xiangqi and Makruk.
• The quantum rules on every board: split, merge, Measure and ordinary moves; "land = roll, pass = link", drops included; kings, pawns and the pieces a variant names always solid; castling and en passant only when they are certain; a roll whenever the game would end in some possibilities but not in others; a budget of 8 arrangements per side.
• The classic end rules in the two-player variants with a king and one move per turn: capture the king instead of check, "your king cannot escape", and the bare-kings and 50-move draws, which wait while a king can be captured for certain; a variant with its own goal keeps it.
• Computer player for every variant with three levels (Easy, Normal and Hard), running in your browser and keeping the board responsive while it thinks. It plays the quantum moves too: splits that fork, dodge or block, merges that capture and measurements that settle a danger. In the hidden-information variants it sees only what its own side may see.
• Pass & play for two players, or four in Bughouse and Four-player chess, on one device; against the computer you take one seat and the computer plays all the others. In Kriegspiel and Fog of war each player sees only their own view: a hand-over screen covers the board between turns, and the whole board is revealed when the game ends.
• Variant screens: Chess variants in the navigation and on the home page, with the catalogue by category and your games on this device; a New game dialog for the opponent, level, side and the variant's options; a game screen for any board shape with the variant's rules next to the shared quantum rules, pieces in hand, the odds of every roll before you confirm, a numbered move list, and undo that never rolls a result again.
• Phones and tablets: large boards zoom with the buttons, a pinch or Ctrl + wheel and pan with a finger; 4D chess, Bughouse and 5D chess open on the boards you play, and the move controls stay at the bottom of the screen.
• Languages: the variants are in English, Dutch, German and French, like the rest of the app.

Changed

• The App Store page is in English only. The app itself is still in English, Dutch, German and French.

Maintenance release.

Maintenance release.

The first release: chess with superposition, measurement and entanglement, inside Nextcloud.

Added

• Rules version 1: split, merge, Measure and ordinary moves; "land = roll, pass = link"; kings and pawns always solid; a budget of 8 arrangements per side; capture the king to win, including the "king cannot escape" rule; draws by agreement, bare kings, threefold repetition, the 50-move rule, no legal move and the move limit. Identical JavaScript and PHP rules engines, checked against shared test fixtures.
• Game screen: ghosts with exact percentages, part threads and link glyphs, the what-if view, the king-danger ring and the king safety net, budget pips and the possibilities count, a move preview with the odds of every result, the roll animation with a plain-language explanation, a move list and roll log; click, drag and keyboard input; three board themes (Classic, Blue, Quantum), the cburnett pieces and synthesised sound.
• Online correspondence games with other users: invitations and open challenges, 1, 3 or 7 days per move, draw offers, resignation, abort, rematch, chat with quick phrases and mute, Elo ratings with a provisional period and an opt-in leaderboard, recent games on the home page.
• Fair online play: rolls drawn by the server when a move is applied and recorded in a hash chain, a check in every client with a warning when history was altered, and the coach switched off in your own running online games.
• Computer player with five levels, from Wobbles to The Observer, running in the browser.
• AI opponents with four personalities (Professor Qubit, Captain Collapse, Madame Superposa, Q-7) through Nextcloud AI (TaskProcessing), an organisation provider or a personal API key (OpenAI-compatible services and Anthropic), with the built-in computer player as a fallback.
• Pass & play on one device, with player names and optional automatic board flipping.
• Trainer: eleven interactive lessons and eleven puzzles, all verified against the real rules engine by the test suite.
• Coach and review: evaluation bar, hints, threat warnings and move-quality badges; an AI coach for questions about the position; a post-game review with an evaluation graph and key moments.
• Nextcloud integration: notifications with Accept, Decline and Rematch actions for the web, mobile and desktop clients; a dashboard widget; navigation and tab-title counters; light, dark and high-contrast themes.
• Settings: in-app settings for the board, quantum display, moves, animation, sound and coach; personal settings for online play, notifications and AI; admin settings for multiplayer, the leaderboard, AI sources, local AI servers and limits.
• Privacy and security: encrypted API keys that never reach the browser, protection against requests to internal addresses, rate limits, a first-use notice before any AI request, and clean-up when an account is deleted.
• Languages: English, Dutch, German and French.