Answer based on context:

The newly minted 1982 Los Angeles Raiders season finished the 1982 NFL strike 1982 NFL season 8-1 to win the AFC West, but lost in the second round of the 1982-83 NFL playoffs to the 1982 New York Jets season. The 1983 NFL season, the 1983 Los Angeles Raiders season finished 12-4 to win the AFC West. Convincing playoff wins over the 1983 Pittsburgh Steelers season and 1983 Seattle Seahawks season in the 1983-84 NFL playoffs propelled the Raiders to their fourth Super Bowl. Against the 1983 Washington Redskins season in Super Bowl XVIII, the Raiders built a lead after blocking a punt and recovering for a touchdown early in the game. A Branch touchdown reception from Plunkett put the Raiders up 14-0 with more than nine minutes remaining in the first quarter. With seven seconds remaining in the first half, linebacker Jack Squirek intercepted a Joe Theismann swing pass at the Washington five yard line and scored, sending the Raiders to a 21-3 halftime lead. Following a John Riggins one-yard touchdown run (extra point was blocked), Marcus Allen scored from five yards out to build the lead to 28-9. The Raiders sealed the game with Allen reversed his route on a Super Bowl record run that turned into a 74-yard touchdown. The Raiders went on to a 38-9 victory and their third NFL championship. Allen set a record for most rushing yards (191) and combined yards (209) in a Super Bowl as the Raiders won their third Super Bowl in eight years.

How many points did the Redskins have at the end of the first half of Super Bowl XVIII?
3