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LLDsystem_design~12 mins

Win condition checking in LLD - Architecture Diagram

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System Overview - Win condition checking

This system checks if a player has won a game by evaluating the current game state against predefined winning conditions. It must quickly and accurately determine the winner or if the game continues, supporting real-time gameplay.

Architecture Diagram
User
  |
  v
Game Interface
  |
  v
Win Condition Checker Service
  |        |
  v        v
Game State Store  Rules Engine
  |                |
  +----------------+
           |
           v
       Response
Components
User
actor
Player interacting with the game interface
Game Interface
frontend
Collects player moves and displays game status
Win Condition Checker Service
service
Evaluates game state against winning rules
Game State Store
database
Stores current game board and player moves
Rules Engine
service
Contains logic for all possible winning conditions
Response
output
Sends result back to the user interface
Request Flow - 7 Hops
User → Game Interface
Game Interface → Win Condition Checker Service
Win Condition Checker Service → Game State Store
Win Condition Checker Service → Rules Engine
Rules Engine → Win Condition Checker Service
Win Condition Checker Service → Game Interface
Game Interface → User
Failure Scenario
Component Fails:Game State Store
Impact:Win condition checker cannot retrieve current game state, so it cannot verify if a player has won. Game progress checking halts.
Mitigation:Use database replication and caching to provide fallback reads. Notify users of temporary unavailability if writes fail.
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for storing the current game board?
AWin Condition Checker Service
BGame State Store
CRules Engine
DGame Interface
Design Principle
Separating the win condition logic into a dedicated Rules Engine service allows for modular, maintainable, and scalable evaluation of game states. This design supports quick updates to rules without affecting other components and ensures clear responsibility boundaries.