There are two scenarios where an 1150/60 Player (Player A) could beat a 1950/60 Player (Player B). Scenario 1: Player A is just an alt of a very good player, and the battle was fair, with little to no hax, and whatever hax happened really didn't make a difference because the two players were close in skill naturally. Scenario 2: Player A is a no-name who just started, and somehow managed to beat Player B, with copious amounts of hax. This is assuming Player B makes no mistakes in the course of the battle, of course, and is either out-played or haxed. There is no way to tell the probability of either happening really, since I assume due to the way the ladder is set up that it doesn't happen often (that is, players whose ratings are close together are paired up more often).