Game model

gistfile1.cs

public interface IWeapon
{
    void Hit(string target);
}

public class Sword : IWeapon
{
    public void Hit(string target)
    {
        Console.WriteLine("Chopped {0}", target);
    }
}

public class ShortSword : IWeapon
{
    public void Hit(string target)
    {
        Console.WriteLine("Cut {0}", target);
    }
}

public class Knife : IWeapon
{
    public void Hit(string target)
    {
        Console.WriteLine("Pierced {0}", target);
    }
}

public interface ICharacter
{
    void Attack(string target);
}

public class Warrior : ICharacter
{
    public IWeapon Weapon { get; protected set; }

    public Warrior(IWeapon weapon)
    {
        Weapon = weapon;
    }

    public void Attack(string target)
    {
        Weapon.Hit(target);
    }
}

public class Thief : ICharacter
{
    public IWeapon LeftWeapon { get; protected set; }
    public IWeapon RightWeapon { get; protected set; }

    public Thief(IWeapon leftWeapon, IWeapon rightWeapon)
    {
        LeftWeapon = leftWeapon;
        RightWeapon = rightWeapon;
    }

    public void Attack(string target)
    {
        LeftWeapon.Hit(target);
        RightWeapon.Hit(target);
    }
}