Question: When is the last time the redskins won a superbowl?
Disambiguated questions and answers: question: What season is the last time the redskins won a superbowl?
Which superbowl is the last time the redskins won a superbowl?
What date is the last time the redskins won a superbowl?
answer: 1991 season
1991
Super Bowl XXVI
XXVI
January 26, 1992
Natural Questions answer: 1991 (from the Wikipedia article "Washington Redskins")