.NET Fiddle

CSharp · Console

/Program.cs

using System;
					
public class Program
{
	public static void Main()
	{
		Console.WriteLine("Hello World");
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
		playerTwo();
	}
	
	private static int playerOneScore = 1000;
	private static Random rnd = new Random();
    private static void playerTwo()
    {
		int attack = rnd.Next(1, 10);
		
		//int playerOneScore = 1000; <-- don't set playerOneScore inside the method, as this line gets executed with every time calling this method so it again and again gets set to 1000
		//int playerOneScores; <-- don't get the meaning of this one, so I removed it and I am changing the playerOneScore field
		
		playerOneScore = playerOneScore - (1 * attack);
		Console.WriteLine(playerOneScore.ToString());
    }
}