gistfile1.java

package chess;
import chess.ChessPiece;
import chess.Color;
import chess.PiecePosition;
import java.util.Scanner;

public class GameEnginge {
	static CheckBoard chessBoard = new CheckBoard();
	
	GameEnginge () {
	}
	
	static void runGame () {
		addPieces();
		
		Scanner inputScan = new Scanner ( System.in );
		boolean play = true;
		
		while ( play ) {
			chessBoard.updateChessBoard();
			chessBoard.printBoard();
			System.out.print("enter move: ");
			String inputString = inputScan.nextLine();
			if ( inputString.toUpperCase() == "Q" ) { play = false; }
			makeNewMove ( inputString );
		}
		inputScan.close();
	}
	
	static void addPieces () {
		
		Pawn pawn1 = new Pawn ( Color.BLACK, new PiecePosition (1,2), chessBoard );
		Pawn pawn2 = new Pawn ( Color.BLACK, new PiecePosition (2,2), chessBoard );
		Pawn pawn3 = new Pawn ( Color.BLACK, new PiecePosition (3,2), chessBoard );
		Pawn pawn4 = new Pawn ( Color.BLACK, new PiecePosition (4,2), chessBoard );
		Pawn pawn5 = new Pawn ( Color.BLACK, new PiecePosition (5,2), chessBoard );
		Pawn pawn6 = new Pawn ( Color.BLACK, new PiecePosition (6,2), chessBoard );
		Pawn pawn7 = new Pawn ( Color.BLACK, new PiecePosition (7,2), chessBoard );
		Pawn pawn8 = new Pawn ( Color.BLACK, new PiecePosition (8,2), chessBoard );
		
		King king1 = new King ( Color.BLACK, new PiecePosition (5,1), chessBoard );
		Queen queen1 = new Queen ( Color.BLACK, new PiecePosition (4,1), chessBoard );
		Rook rook1 = new Rook ( Color.BLACK, new PiecePosition (1,1), chessBoard );
		Rook rook2 = new Rook ( Color.BLACK, new PiecePosition (8,1), chessBoard );
		Bishop bishop1 = new Bishop ( Color.BLACK, new PiecePosition (3,1), chessBoard );
		Bishop bishop2 = new Bishop ( Color.BLACK, new PiecePosition (6,1), chessBoard );
		Knight knight1 = new Knight ( Color.BLACK, new PiecePosition (2,1), chessBoard );
		Knight knight2 = new Knight ( Color.BLACK, new PiecePosition (7,1), chessBoard );
		
		Pawn pawn11 = new Pawn ( Color.WHITE, new PiecePosition (1,7), chessBoard );
		Pawn pawn12 = new Pawn ( Color.WHITE, new PiecePosition (2,7), chessBoard );
		Pawn pawn13 = new Pawn ( Color.WHITE, new PiecePosition (3,7), chessBoard );
		Pawn pawn14 = new Pawn ( Color.WHITE, new PiecePosition (4,7), chessBoard );
		Pawn pawn15 = new Pawn ( Color.WHITE, new PiecePosition (5,7), chessBoard );
		Pawn pawn16 = new Pawn ( Color.WHITE, new PiecePosition (6,7), chessBoard );
		Pawn pawn17 = new Pawn ( Color.WHITE, new PiecePosition (7,7), chessBoard );
		Pawn pawn18 = new Pawn ( Color.WHITE, new PiecePosition (8,7), chessBoard );
		
		King king11 = new King ( Color.WHITE, new PiecePosition (5,8), chessBoard );
		Queen queen11 = new Queen ( Color.WHITE, new PiecePosition (4,8), chessBoard );
		Rook rook11 = new Rook ( Color.WHITE, new PiecePosition (1,8), chessBoard );
		Rook rook12 = new Rook ( Color.WHITE, new PiecePosition (8,8), chessBoard );
		Bishop bishop11 = new Bishop ( Color.WHITE, new PiecePosition (3,8), chessBoard );
		Bishop bishop12 = new Bishop ( Color.WHITE, new PiecePosition (6,8), chessBoard );
		Knight knight11 = new Knight ( Color.WHITE, new PiecePosition (2,8), chessBoard );
		Knight knight12 = new Knight ( Color.WHITE, new PiecePosition (7,8), chessBoard );
	}
	
	private static void makeNewMove ( String inputString ) {
		if ( inputString.length() != 4 || 
				!"abcdefgh".contains(Character.toString(inputString.charAt(0))) ||
				!"12345678".contains(Character.toString(inputString.charAt(1))) ||
				!"abcdefgh".contains(Character.toString(inputString.charAt(2))) ||
				!"12345678".contains(Character.toString(inputString.charAt(3)))) {
			throw new IllegalArgumentException( "illegal input");
		}
		PiecePosition pieceToBeMovedPos = new PiecePosition ( Character.getNumericValue ( inputString.charAt(0) ) - 9, 
				Character.getNumericValue(inputString.charAt(1) ) );
		PiecePosition moveToPosition = new PiecePosition ( Character.getNumericValue(inputString.charAt(2)) - 9, 
				Character.getNumericValue(inputString.charAt(3) ) );
		
		if ( chessBoard.containsChessPiece ( pieceToBeMovedPos ) ) {
			ChessPiece pieceToBeMoved = chessBoard.getChessPiece( pieceToBeMovedPos );
			pieceToBeMoved.move( moveToPosition );
		}
		
		
	}
	
}

gistfile2.txt

package chess;

public class Knight extends ChessPiece {
	Knight ( Color knightColor, PiecePosition knightPosition, CheckBoard checkBoard ) {
		super( knightColor, knightPosition, checkBoard );
		if ( knightColor == Color.WHITE ) {
			this.pieceString =  "\u2658 ";
		} else {
			this.pieceString = "\u265E ";
		}
	}

	@Override
	public void move(PiecePosition moveTo) {
		// TODO Auto-generated method stub
		
	}

	@Override
	boolean isLegitimateMove(PiecePosition moveTo, CheckBoard chessBoard) {
		if ( ! chessBoard.isClearOfSight( this, moveTo, MoveType.THATHORSEMOVEYOUKNOW ) ) { return false; }
		return false;
	}

}