using System;

​

public class ChessPiece

{

    public string colour { get; set; }

    public virtual void Describe()

    {

        Console.Write("This pice is ");

        Console.Write(colour);

        Console.WriteLine(".");

    }

}

​

public class Queen : ChessPiece

{

    public override void Describe()

    {

        Console.WriteLine("This piece is a queen.");

        base.Describe();

    }

}

​

public class King : ChessPiece

{

    public override void Describe()

    {

        Console.WriteLine("This piece is a king.");

        base.Describe();

    }

}

​

public class Pawn : ChessPiece

{

    public override void Describe()

    {

        Console.WriteLine("This piece is a pawn.");

        base.Describe();

    }

}

​

public class Demmo

{

    public static int Main( )

    {

        ChessPiece[] cObj = new ChessPiece[3];

​

        cObj[0] = new Queen();

        cObj[1] = new King();

        cObj[2] = new Pawn();

        cObj[0].colour = "White";

        cObj[1].colour = "White";

        cObj[2].colour = "Black";

​

        foreach (ChessPiece chessObj in cObj)

        {

            chessObj.Describe();

        }

        return 0;

    }

}