Stonefold processes stone positions, legal moves, captures, ko state, territory, scores, AI decisions, and local preferences only as needed to provide the game.
About Stonefold
Stonefold is an offline implementation of Go supporting 9×9, 13×13, and 19×19 boards.
Players place stones on intersections, capture opposing groups, claim territory, pass when appropriate, and finish with automatic scoring.
Personal Information
Stonefold does not require a name, email address, phone number, password, payment information, contacts, precise location, or other personal profile information for core gameplay.
Board State
During a match, Stonefold processes the information required to maintain the current Go position.
Black or white
Board coordinate
Current player
Group breathing spaces
Repetition restriction
End-game flow
Stone Placement
Stonefold processes touch input when the user selects a legal board intersection.
Placed stones become part of the current local match state.
Legal Move Validation
The game evaluates whether an intersection is empty and whether placing a stone there complies with the supported rules.
Illegal placements are rejected locally.
Liberties and Groups
Stonefold identifies connected stones of the same color and calculates their liberties to determine whether a group remains alive on the board.
Captures
If an opposing group has no remaining liberties after a legal move, Stonefold removes those stones from the board according to the rules of Go.
Suicide Prevention
Stonefold may prevent a move that would leave the newly placed stone or its connected group without liberties when that move is prohibited by the supported rules.
Ko Rule
The game tracks recent board state as needed to prevent immediate repetitions prohibited by the ko rule.
Ko information is temporary gameplay state.
Passing
Players may pass instead of placing a stone. Stonefold may track consecutive passes to determine when normal play is finished and scoring should begin.
Territory and Final Score
At the end of a game, Stonefold may evaluate controlled empty intersections, captured stones, or other supported scoring elements to determine the result.
Final scoring is calculated on the device.
Board Sizes
Stonefold supports different board sizes so users can choose shorter 9×9 games, intermediate 13×13 games, or traditional 19×19 play.
The selected board size may be remembered as a local preference.
Computer Opponents
Stonefold may use an on-device AI opponent that evaluates board positions, captures, liberties, territory, local fights, and future move possibilities before choosing a move.
The AI does not require a remote AI service.
AI Difficulty
Difficulty levels may change search depth, move evaluation, tactical strength, response quality, or other computer-opponent behavior.
Difficulty is a local game option.
Local Two-Player Mode
Pass-and-play allows two people to take alternating turns on the same device.
This mode does not require online matchmaking, usernames, or remote player accounts.
Local Storage
Stonefold may store basic settings and game information needed to preserve the user's preferences.
9×9, 13×13, 19×19
Opponent setting
AI or local play
Local preference
Local preference
If resume is supported
Offline Operation
Move validation, captures, liberty calculations, ko enforcement, AI decisions, local two-player play, and scoring are designed to work without an internet connection.
No Cloud Account
Stonefold does not require a developer-operated account or cloud synchronization service for its core functionality.
Device Permissions
Core gameplay does not require access to contacts, camera, microphone, precise location, messages, call history, photos, or personal documents.
No Third-Party Ads
Stonefold is designed as an ad-free game and does not require an advertising identifier for its core functionality.
No Behavioral Profiling
Stonefold does not use move choices, captures, territory decisions, match results, board-size selections, or AI difficulty choices to create advertising or cross-app behavioral profiles.
Third-Party Sharing
Stonefold does not sell, rent, or trade local match information, preferences, or personal information to advertisers, data brokers, or unrelated third parties.
Children's Privacy
No personal information must be submitted to the developer in order to play Stonefold.
Removing Local Data
Locally stored Stonefold information can generally be removed by clearing the application's storage or uninstalling the app.
Changes to This Privacy Policy
This Privacy Policy may be updated if future versions of Stonefold introduce new features or change how information is handled.
Last updated: August 13, 2026
Contact
Questions about Stonefold or this Privacy Policy may be sent to:
Stonefold is designed around offline Go with local AI, local pass-and-play, proper rules, and no account requirement.