Question: When did the loser of the April 30,1976 match beat George Foreman?

Context paragraphs:
Foreman For Real: Foreman For Real (フォアマン フォーリアル ) is a 1995 boxing video game for the Game Boy, Game Gear, Sega Genesis, and the Super Nintendo Entertainment System featuring George Foreman.  It is the follow-up to Acclaim's previous release, "George Foreman's KO Boxing".

George Foreman Grill: The George Foreman Lean Mean Fat-Reducing Grilling Machine, commonly known as the George Foreman Grill, is an indoor, electrically heated grill manufactured by Spectrum Brands.  It is promoted by former boxing champion George Foreman.  Since its introduction in 1994, over 100 million George Foreman grills have been sold worldwide.

Jimmy Young (boxer): Jimmy Young (November 14, 1948 – February 20, 2005) was an American heavyweight professional boxer.  Young was known for his awkward, defensive style and counterpunching.  He had his greatest success at during the mid 1970s, most notably when he beat George Foreman in 1977 and lost the year beforehand a disputed decision against Muhammad Ali.  Young fought many significant fighters of his era, including twice outpointing Ron Lyle and losing only by a split decision to then-number one contender Ken Norton in a title eliminator in late 1977.

George Foreman's KO Boxing: George Foreman's KO Boxing is a boxing video game produced by Acclaim, featuring boxer George Foreman, released in 1992.  Years later, Acclaim released another game featuring Foreman, "Foreman For Real".

Leon Gast: Leon Gast is an American documentary film director, producer, cinematographer, and editor.  His documentary, "When We Were Kings" depicts the iconic heavyweight boxing match: The Rumble in the Jungle between Muhammad Ali and George Foreman.  This film would go on to win the 1996 Academy Award for Documentary Feature and the Independent Spirit Award.  Gast co-directed the 1977 documentary, "The Grateful Dead Movie" with guitarist Jerry Garcia.  The film captured the band's October 1974, five-night performance at the Winterland Ballroom in San Francisco.  Gast also co-directed the 1983 film "Hell's Angels Forever," which focused on the notorious motorcycle club Hells Angels.  The Angels are believed to have learned that Gast put material in the documentary in which they didn't prefer.  To this end, Gast claims that the Angels tracked him down and beat him up.  Gast has also produced works on B.B. King and Celia Cruz.

Juan Guzman (boxer): Juan Antonio Guzman Batista (Born August 21, 1951), better known as Juan Guzman, is a Dominican former professional boxer and WBA world Junior Flyweight champion.  Due to his high percentage of wins by knockout (specially for his division, the 108 pounds limit division), he was nicknamed "El Pequeno Foreman" ("Little Foreman", after George Foreman).  Guzman was born in Santiago de los Caballeros, during the Rafael Trujillo dictatorship era.

Zaire 74: Zaire 74 was a three-day live music festival that took place on September 22 to 24, 1974 at the 20th of May Stadium in Kinshasa, Zaire (now Democratic Republic of the Congo).  The concert, conceived by South African trumpeter Hugh Masekela and record producer Stewart Levine, was meant to be a major promotional event for the heavyweight boxing championship match between Muhammad Ali and George Foreman, known as The Rumble in the Jungle.  When an injury forced Foreman to postpone the fight by six weeks, the festival's intended audience of international tourists was all but eliminated and Levine had to decide whether or not to cancel the event.  The decision was made to move forward, and 80,000 people attended.

Elmo Henderson: Elmo Henderson born April 8, 1935 is an African-American former boxer from Texas.  Despite his dubious claim of a 1972 win against Muhammad Ali in an exhibition match in San Antonio, Texas, he did not become particularly well known in the boxing community; John Spong of the "Texas Monthly" said that the match was the "shot not heard round the world".  However, people who attended the exhibition say Elmo Henderson did not defeat Ali, and newspaper reports after the exhibition made no mention of Ali losing.  After the match, Henderson became a part of George Foreman's Rumble in the Jungle event in Zaire and won a libel suit against Norman Mailer and "Playboy".  As of 2003, Henderson was a homeless man in Austin, Texas.  As of 2015, Henderson lives in a care home in Northern California.

Muhammad Ali vs. Jimmy Young: Muhammad Ali and Jimmy Young fought a boxing match on April 30, 1976. Ali won the bout through a unanimous decision on points.

George Foreman vs. Axel Schulz: George Foreman vs. Axel Schulz, billed as "Celebration", was a professional boxing match contested on April 22, 1995 for Foreman's IBF and lineal heavyweight championships, as well as the vacant WBU heavyweight championship.

Supporting paragraphs: Muhammad Ali vs. Jimmy Young Jimmy Young (boxer)
Answer: 1977