using System;

​

public class Condition

{

    public virtual bool IsSatisified(Player player) { return false; }

}

​

public class HasKills : Condition

{

    private int Kills;

    public HasKills(int kills) => Kills = kills;

    public override bool IsSatisified(Player player)

    {

        return player.kills >= Kills;

    }

}

​

public class HasName : Condition

{

    private string Name;

    public HasName(string name) => Name = name;

    public override bool IsSatisified(Player player)

    {

        return player.name.Equals(Name);

    }

}

​

public class HasPosition : Condition

{

    private Vector3 Point;

    public HasPosition(Vector3 point) => Point = point;

    public override bool IsSatisified(Player player)

    {

        return player.position == Point;

    }   

}

​

// ignore just demo example

public struct Vector3

{

    public float x,y,z;

    public Vector3(float x,float y,float z) {this.x=x;this.y=y;this.z=z;} 

    public static bool operator ==(Vector3 v1, Vector3 v2) { return v1.x == v2.x && v1.y == v2.y && v1.z == v2.z; }

    public static bool operator !=(Vector3 v1, Vector3 v2) { return !(v1==v2); }

    public override int GetHashCode() 

    {

        return (int)(this.x + this.y + this.z);

    }

    public override bool Equals(object obj)

    {

        return this == (Vector3)obj;

    }   

}

​

// ignore just demo example

public class Player

{

    public string name = "Player";

    public int kills;

    public int credits;

    public Vector3 position;

}

​

public class Program

{

    public static void Main()

    {

        var player = new Player();

        var killsTest = new HasKills(5);

        var nameTest = new HasName("Foo");

        var posTest = new HasPosition(new Vector3(1,2,3));

        Console.WriteLine("KillsTest(1): "  + killsTest.IsSatisified(player));

        player.kills = 10;

        Console.WriteLine("KillsTest(2): "  + killsTest.IsSatisified(player));

        Console.WriteLine("NameTest(1): "  + nameTest.IsSatisified(player));

        player.name = "Foo";

        Console.WriteLine("NameTest(2): "  + nameTest.IsSatisified(player));

        Console.WriteLine("posTest(1): "  + posTest.IsSatisified(player));

        player.position = new Vector3(1,2,3);

        Console.WriteLine("posTest(2): "  + posTest.IsSatisified(player));

    }

}