Our expert says, "So, a player commences with 2 units. "They will drop back one after a defeat. After the first victory, they drop to one, so after the second victory, they gradually increase by one unit. Therefore, in order to win 4 unit, you must have four victories in a row, which means that most of the moment you will either lose or have a little win. It appears to be a progressing non-aggressive tactic.