Design a chess application system: matchmaking, creating a game session, and recording game results. Specify services, their interactions, and data stores.

For a chess application with matchmaking, game sessions, and result recording, a system can be designed from several services:

1. Authentication and User Service

   • Stores user data, their ratings.

2. Matchmaking Service

   • Handles requests to find an opponent.
   • Uses algorithms to match players based on rating and activity.
   • Creates a game session upon successful matching.

3. Game Session Service

   • Manages the state of the game: board, moves, timers.
   • Ensures synchronization between players (via WebSocket or gRPC).

4. Recording and Analytics Service

   • Saves game results, statistics.
   • Updates player ratings.

5. Data Storage

   • Relational database (e.g., PostgreSQL) for users, games, and results.
   • Cache (Redis) for quick access to active session states.

Interaction:

• User sends a matchmaking request.
• Matchmaking service finds an opponent and creates a game session.
• The game session manages moves and game state.
• After the game, the recording service saves the result and updates ratings.

This approach allows scaling components independently and ensures separation of responsibilities.