CHICAGO — The Washington Wizards had to wait six years to get back to the postseason. But they only needed two games to really get introduced to playoff basketball, with more physical play, short tempers and extreme rallies. In the intense cauldron of United Center — a place that has devoured more seasoned units — the Wizards refused to relent after watching a 17-point lead turn into a 10-point deficit in the fourth quarter and didn’t crumble when they were betrayed by free throws and calls that went against them.