The Washington Mystics broke into two groups and lined up for a shooting drill Tuesday afternoon at the end of their first practice of the postseason, each team trying to make seven shots from one spot before shifting to another location. As players shuffled from the top of the key to the elbow to the corner of the court and back, each shooter made mental notes. Everything from the arena's lighting to where the seats are positioned behind the basket to how sticky the floor felt running from one spot to the next got filed away, logged in the back of the Mystics' minds as they acclimated to George Washington's Smith Center, their intimate new home for the playoffs. When third-seeded Washington (22-12 in the regular season) opens its postseason against sixth-seeded Los Angeles (19-15) today at 6:30 p.m., it won't be in its usual home, the cavernous, 18,000-capacity Capital One Arena. Instead the Mystics will battle the 2016 WNBA champions some two miles west, in a 5,000-seat college arena that is playing host for the WNBA playoffs while the venue the Mystics shared with the Wizards, Capitals and Washington Valor undergoes significant renovations.