Question: When was the British former professional boxer born who competed from 1971 to 1980 who had a bout with Jorge Victor Ahumada?

full_context: Document 1: John Murray (boxer): John Murray (born 20 December 1984) is a British former professional boxer who competed from 2003 to 2014. He held the English lightweight title from 2007 to 2008; the British lightweight title twice, from 2008 to 2010; and the European lightweight title from 2010 to 2011. He also challenged once for the vacant WBA lightweight title in 2011. John is the brother of British former Olympian Joe Murray. Since retiring, Murray has opened his own gym – Murray Machines Gymnasium – in Reddish, where he trains both amateur and professional boxers.
Document 2: John Conteh: John Anthony Conteh, {'1': ", '2': ", '3': ", '4': "} (born 27 May 1951) is a British former professional boxer who competed from 1971 to 1980. He held multiple light-heavyweight championships, including the WBC title from 1974 to 1978; and the European, British, and Commonwealth titles between 1973 and 1974. Conteh was awarded an MBE in 2017 for services to boxing at the Queen's Birthday Honours.
Document 3: Chuck Wepner: Charles "Chuck" Wepner (born February 26, 1939) is an American former professional boxer who fought at heavyweight. As a world ranked contender he fell just seconds short of a full fifteen rounds with world heavyweight champion Muhammad Ali in a 1975 title fight. Wepner also scored notable wins over Randy Neumann and Ernie Terrell.
Document 4: Anthony Joshua: As of May 2017, Joshua is ranked as the world's best heavyweight by the Transnational Boxing Rankings Board and BoxRec, and second best by "The Ring". His knockout-to-win ratio stands at 100%. Joshua is the second British boxer, after James DeGale, to win both a gold medal at the Olympics and a world title by a major professional sanctioning body, as well as being the first British heavyweight to do so. He is also the second boxer, after Joe Frazier, to win a world heavyweight title whilst still reigning as Olympic champion at the top weight.
Document 5: Jorge Ahumada: Jorge Victor Ahumada (born 1946) is a former professional boxer. Notable fights include four bouts with Victor Galindez, (one of which was a world title challenge at the Madison Square Garden in New York, New York), a title bout with Bob Foster (Foster's last title defense) which ended in a draw, and a bout with John Conteh for the WBC Light Heavyweight Championship.
Document 6: Muhammad Ali vs. Antonio Inoki: The fight between American boxer Muhammad Ali and Japanese professional wrestler Antonio Inoki was held at the Nippon Budokan arena in Tokyo on June 26, 1976. At the time, Ali had come off a knockout victory over Richard Dunn in May and was the reigning WBC/WBA Heavyweight Champion. Inoki, who had been taught the art of catch wrestling by legendary wrestler Karl Gotch, was staging exhibition fights against champions of various martial arts, in an attempt to show that pro wrestling was the dominant fighting discipline.
Document 7: George Chuvalo: George Louis Chuvalo, CM (born September 12, 1937) is a retired Canadian professional boxer who was a five-time Canadian heavyweight champion, and two-time world heavyweight title challenger. Chuvalo, who is considered by many to have one of the best chins in boxing history, was never knocked down in his amateur career or his 93-fight professional career and was ranked #4 on ESPN's greatest chin in boxing history list. Chuvalo lost to Hall of Fame heavyweights such as Floyd Patterson, Muhammad Ali, Joe Frazier and George Foreman, but was credited for his spirited performances. He did defeat top contenders such as Yvon Durelle, Doug Jones, Jerry Quarry and Cleveland Williams. He fought for the world title twice, losing a controversial decision to Ernie Terrell and another decision in his first fight with Ali.
Document 8: Charles Manyuchi: Charles Manyuchi is a Zimbabwean professional boxer who is the WBC, international welterweight champion since March 2014. In November 2014, he successfully defended his WBC crown in a Lusaka, Zambia fight against an opponent from Colombia. In 2014 he was awarded the Zimbabwe's Sportsperson of the year accolade. In July 2015 against an Italian boxer in Friuli-Venezia Giulia, he defended his crown successfully.In 2017 saw the fall of great man who was bound for glory and wider recognition internationally when he lost his title to Quadratilo from Singapore in what was referred as a huge upset in the boxing world especially to the fans back home. Coming back home,he received unwelcome remarks and comments from many fans but he however had support from government claiming to sue those who continued to attack him. The are currently plans to have a rematch.
Document 9: Juan Manuel Márquez vs. Joel Casamayor: Juan Manuel Márquez vs. Joel Casamayor was a boxing lightweight superfight. In 2008 reigning lightweight Champion "El Cepillo" Casamayor met former two-division World Champion Juan Manuel "Dinamita" Márquez at the MGM Grand Garden Arena in Las Vegas for a 12-round championship bout. Casamayor was the champion of boxing's lightweight division, recognized as the title holder by Ring Magazine, even though he didn't own any of the belts from boxing's four major sanctioning bodies.
Document 10: The Rumble in the Jungle: The Rumble in the Jungle was a historic boxing event in Kinshasa, Zaire (now Democratic Republic of the Congo) on October 30, 1974 (at 4:00 am). Held at the 20th of May Stadium (now the Stade Tata Raphaël), it pitted the undefeated world heavyweight champion George Foreman against challenger Muhammad Ali, a former heavyweight champion; the attendance was 60,000. Ali won by knockout, putting Foreman down just before the end of the eighth round. It has been called "arguably the greatest sporting event of the 20th century". The event was one of Don King's first ventures as a professional boxing promoter.
Document 11: Jorge Arce: Jorge Armando Arce Armenta ( ; born July 27, 1979), best known as Jorge Arce, is a Mexican former professional boxer who competed from 1996 to 2014. He is a five-time world champion, and the second boxer from Mexico to win world titles in four weight divisions (after Érik Morales, who first achieved the feat two months prior). In a storied career, Arce held the WBO light flyweight title from 1998 to 1999; the WBC and lineal light flyweight titles from 2002 to 2004; the WBO super flyweight title in 2010; the WBO junior featherweight title in 2011; and the WBO bantamweight title from 2011 to 2012. Additionally he held the WBC interim flyweight title from 2005 to 2006, the WBA interim super flyweight title from 2008 to 2009, and challenged once for the WBC featherweight title in his final fight in 2014.
Document 12: Bob Foster (boxer): Robert Lloyd "Bob" Foster (December 15, 1938 – November 21, 2015) was an American professional boxer who fought as a light heavyweight and heavyweight. Known as "The Deputy Sheriff", Foster was one of the greatest light heavyweight champions in boxing history. He won the world light heavyweight title from Dick Tiger in 1968 via fourth-round knockout, and went on to defend his crown fourteen times in total from 1968 to 1974. Foster challenged heavyweight kings Joe Frazier and Muhammad Ali during his career, but was knocked out by both fighters (the fight with Ali was not for a world heavyweight title, but for the regional NABF version).
Document 13: Sylvester Mittee: Sylvester "The Master Blaster" Mittee ( (1956--) 29 1956 (age 61 ) ) is a Saint Lucian/British amateur lightweight and professional light welter/welter/light middleweight boxer of the 1970s and '80s who as an amateur won the 1973 Amateur Boxing Association of England (ABAE) Junior Class-B title boxing out of Crown and Manor ABC , Hoxton, London, won the 1976 Amateur Boxing Association of England (ABAE) lightweight title, against Thomas McCallum (Sparta BC), boxing out of Repton Amateur Boxing Club , Bethnal Green, London, and represented Great Britain as a lightweight in the Boxing at the 1976 Summer Olympics in Montreal, Quebec, Canada, losing to eventual silver medal winner Simion Cuţov of Romania, and as a professional won the British Boxing Board of Control (BBBofC) Southern (England) Area light welterweight title, BBBofC British welterweight title and Commonwealth welterweight title, and was a challenger for the BBBofC British light welterweight title against Clinton McKenzie, and European Boxing Union (EBU) welterweight title against Lloyd Honeyghan, his professional fighting weight varied from 139 lb , i.e. light welterweight to 151+1/2 lb , i.e. light middleweight.
Document 14: Boxing in Liverpool: Boxing in Liverpool, United Kingdom includes approximately 22 amateur boxing clubs which have produced notable boxers such as John Conteh, Andy Holligan, Tony Bellew, and David Price.
Document 15: Joe Calzaghe: Joseph William Calzaghe, {'1': ", '2': ", '3': ", '4': "} ( ; born 23 March 1972) is a Welsh former professional boxer who competed from 1993 to 2008. He is a two-weight world champion, having held the unified WBA (Super), WBC, IBF, WBO, "Ring" magazine, and lineal super-middleweight titles, as well as the "Ring" light-heavyweight title. Calzaghe is the longest-reigning super-middleweight world champion in boxing history, having held the WBO title for over 10 years and making 21 successful defences before moving up to light-heavyweight. As his super-middleweight and light-heavyweight reigns overlapped, he retired with the longest continual time as world champion of any active fighter.
ground_truth: 27 May 1951