Yes. Washington has beaten the Cowboys twice in a season four times -- in 1984, 1987, 1995 and 2005:
The Dallas Cowboys have defeated the Washington Redskins twice in a season 16 times (in 1968, 1969, 1970, 1977, 1980, 1981, 1985, 1994, 1998, 1999, 2000, 2001, 2003, 2004, 2009 and 2011).
Redskins
eagles, redskins, and patriots
In 2005.
No, the 'Skins choked. The Dallas Cowboys beat the Washington Redskins 14-10.
Twice, as his Dallas Cowboys swept Lombardi's Washington Redskins in the 1969 season. They were Landry's only career wins over Lombardi in seven games counting Lombardi's tenures with the Packers and Redskins.
Dallas Cowboys, 37-10, on December 22, 1996.
Eagles 31-7 in Philadelphia, Rams 27-23 in Dallas, and Redskins 20-17 in Washington.
From November 16, 1997 to November 28, 2002, the Dallas Cowboys defeated the Washington Redskins 10 consecutive times.
Dallas Cowboys, New York Giants, Washington Redskins, San Francisco 49ers.
Through the 2009 season, that was January 5, 1992 when they defeated the Dallas Cowboys, 38-6, in the Wildcard round.
They play at least twice a year so there have been many years that the cowboys have beat the eagles.
Pittsburgh beat Dallas in Super bowl X and XIII. Dallas won Super Bowl XXX. The Dolphins Played the Redskins twice, each winning one. The 49ers played the Bengals twice, winning both times The Cowboys beat The Buffalo Bills in consecutive years in '93 and '94. The Giants beat the Patriots in both Super Bowl XLII and XLVI.