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LLDsystem_design~12 mins

Move validation and check detection in LLD - Architecture Diagram

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System Overview - Move validation and check detection

This system validates chess moves and detects check conditions in a chess game. It ensures that each move follows the rules and identifies if a player's king is under threat after a move. The system must be fast and accurate to support real-time gameplay.

Architecture Diagram
User
  |
  v
Move Input Service
  |
  v
Move Validator Service <--> Board State Store
  |
  v
Check Detection Service
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  v
Response to User
Components
User
client
Sends move commands and receives validation results
Move Input Service
service
Receives and forwards user moves for validation
Move Validator Service
service
Validates moves against chess rules using current board state
Board State Store
database
Stores current positions of all pieces on the board
Check Detection Service
service
Detects if the move results in a check condition
Response to User
client_response
Sends validation and check detection results back to the user
Request Flow - 8 Hops
User → Move Input Service
Move Input Service → Move Validator Service
Move Validator Service → Board State Store
Board State Store → Move Validator Service
Move Validator Service → Check Detection Service
Check Detection Service → Move Validator Service
Move Validator Service → Response to User
Response to User → User
Failure Scenario
Component Fails:Board State Store
Impact:Move Validator Service cannot retrieve current board state, so move validation and check detection fail, blocking gameplay.
Mitigation:Use replicated database instances for failover and caching recent board state in Move Validator Service to allow temporary validation.
Architecture Quiz - 3 Questions
Test your understanding
Which component is responsible for checking if the king is under threat after a move?
ACheck Detection Service
BMove Validator Service
CBoard State Store
DMove Input Service
Design Principle
Separating move validation and check detection into distinct services allows clear responsibility and easier maintenance. Using a centralized board state store ensures consistent data for validation and detection. This modular design supports scalability and real-time responsiveness.