Chess Validator

A Java-based backend engine that models a chessboard and validates legal movements for each chess piece. Built using object-oriented principles, this project simulates a two-player chess game through the command line, enforcing proper turn order and piece-specific move rules.

Features

• Full 8x8 chessboard with all standard pieces (King, Queen, Rook, Bishop, Knight, Pawn)
• Turn-based gameplay (White vs Black)
• Validates legal moves based on piece type and current position
• Detects invalid moves due to:
  • Movement rule violations
  • Occupied squares
  • Capturing same-color pieces
  • Leaping over other pieces (except knight)
• Basic notation handling (e2 e4 style input)
• Visual board printing after every move

Project Structure

• Color.java – Enum class to represent the black and white player colors.
• Pieces.java – Abstract base class for all chess pieces.
• King.java – Subclass of Pieces.java, handles king-specific movement.
• Queen.java – Subclass of Pieces.java, handles queen-specific movement.
• Bishop.java – Subclass of Pieces.java, handles bishop-specific movement.
• Rook.java – Subclass of Pieces.java, handles rook-specific movement.
• Knight.java – Subclass of Pieces.java, handles knight-specific movement.
• Pawn.java – Subclass of Pieces.java, handles pawn-specific movement.
• Player.java – Represents a player and their color.
• Cell.java – Represents a square on the board.
• ChangeRowCol.java – Converts user input like e2 to array indices.
• Board.java – Represents the 8x8 board and manages piece placement.
• ChessGame.java – Game loop, move coordination, input handling.
• Chess.java – Main class, starts the program. Design Principles Used

-Inheritance: Pieces base class with polymorphic isValidMove() implemented by each piece.

-Encapsulation: Position, color, and state logic encapsulated inside each piece.

-Clean Board Abstraction: Board manages piece positioning, printing, and movement logic.

-Input Parser: Handles algebraic notation to array index conversion (e2 → [6, 4]).

Note : This LLD Problem is available in Work@tech website, Please go through the Question for better understanding.

Author

• Jeevitha Shree T