Problem: Background: Joe Jackson Gibbs (born November 25, 1940) is a former American football coach, current NASCAR Championship team owner, and former NHRA team owner. He was the 20th and 26th head coach in the history of the Washington Redskins (1981-1992, 2004-2007). Well known for his long hours and work ethic, Gibbs constructed what Steve Sabol has called, "The most diverse dynasty in NFL history", building championship teams with many players who have had mediocre to average careers while playing for other NFL teams. During his first stint in the National Football League, he coached the Redskins for 12 seasons and led them to eight playoff appearances, four NFC Championship titles, and three Super Bowl titles.
Context: Although Gibbs helped craft a passing-oriented attack during his time in San Diego, his Redskins teams were known to incorporate a smash-mouth, rushing-oriented attack like the counter trey. By building a strong offensive line (known as "The Hogs") Gibbs was able to control the line of scrimmage, allowing workhorse running backs such as John Riggins, George Rogers, and Earnest Byner to power the ground game. Gibbs added a deep passing attack to this which complemented the ground game, utilizing agile receivers such as Art Monk, Gary Clark, and Ricky Sanders. Gibbs' offense was aided during his tenure by aggressive defensive units under the direction of defensive coordinator Richie Petitbon. Gibbs' system and offensive scheme were robust enough to be successful without a Hall-of-Fame-caliber quarterback at the helm. The Redskins' Super Bowl victories were won featuring Joe Theismann, Doug Williams, and Mark Rypien--capable players who were very successful along with their strong supporting cast. Gibbs is credited with inventing the single back, double or triple tight end set. He used it to neutralize Hall of Fame linebacker Lawrence Taylor, realizing that to successfully block him with a running back was impossible; an extra tight end and a tackle were required as well. The extra tight end provided additional protection for the quarterback. Gibbs was also credited for creating the Trips formation; stacking three wide receivers to one side. Gibbs incorporated the shifting and motions for which his offenses were known. The formations created mismatches and confusion for the opposing defenses that would then be exploited. He is also one of few coaches that utilized the H-back position prominently in his offense.
Question: When did he invent that?
Answer:

Problem: Background: Robert Schumann (; 8 June 1810 - 29 July 1856) was a German composer and an influential music critic. He is widely regarded as one of the greatest composers of the Romantic era. Schumann left the study of law, intending to pursue a career as a virtuoso pianist. He had been assured by his teacher Friedrich Wieck, a German pianist, that he could become the finest pianist in Europe, but a hand injury ended this dream.
Context: During Eastertide 1830, he heard the Italian violinist, violist, guitarist, and composer Niccolo Paganini play in Frankfurt. In July he wrote to his mother, "My whole life has been a struggle between Poetry and Prose, or call it Music and Law." By Christmas he was back in Leipzig, at age 20 taking piano lessons from his old master Friedrich Wieck, who assured him that he would be a successful concert pianist after a few years' study with him. During his studies with Wieck, it has been claimed that Schumann permanently injured a finger on his right hand. Wieck claimed that Schumann damaged his finger by the use of a mechanical device designed to strengthen the weakest fingers, a device which held back one finger while he exercised the others. This claim has been discredited by Clara Schumann, who said that the disability was not due to a mechanical device, and Robert Schumann himself refers to it as "an affliction of the whole hand". Some have argued that, as the disability appeared to have been chronic and have affected the hand, and not just a finger, it was unlikely to have been caused by a finger strengthening device. Schumann abandoned the idea of a concert career and devoted himself instead to composition. To this end he began a study of music theory under Heinrich Dorn, a German composer six years his senior and, at that time, conductor of the Leipzig Opera. About this time Schumann considered composing an opera on the subject of Hamlet.
Question: Why did he abandon the idea of a concert career?
Answer:
During his studies with Wieck, it has been claimed that Schumann permanently injured a finger on his right hand.