DungeonWorldAdvantage.cs

void Main()
{
	var d6range = Enumerable.Range(1, 6);
	var rolls = from d1a in d6range // first die of first roll
		        from d1b in d6range // second die of first roll
		        from d2a in d6range // first die of second roll
		        from d2b in d6range // second die of second roll
		        select new { d1a, d1b, d2a, d2b }; // all four dice rolled
				
	var advantages = from r in rolls
	                 let r1 = r.d1a + r.d2a // total of first roll
					 let r2 = r.d2a + r.d2b // total of second roll
					 select Math.Abs(r1-r2); // the advantage
	
	advantages.Average().Dump();
}