Though Moore continued playing on the road—as he would for over 40 years—he began competing and placing in top-tier tournaments. His tournament career was to be overshadowed by an enduring series of runner-up finishes that would earn him the nickname "pool's underpaid prince" in such publications as
Esquire Magazine. The name that stuck with him for life, however, was Cowboy. According to Moore, he became 'Cowboy' Jimmy Moore when he appeared at the Commodore Hotel championships in New York City in the 1950s wearing the required tuxedo, but nevertheless sporting cowboy boots and his signature white Stetson hat. In 1952 he made a strong showing in the same competition, held once more in Boston, running 93 balls against Lassiter, beating him 150 to 25, but again finishing behind Willie Mosconi, this time sharing second place with
Jimmy Caras and
Joe Procita. Moore's match with Mosconi had an ending score of 150 to 58 in 19 innings. The following year Moore took second place yet again in the World Championship, held that year in Philadelphia. The 1954 tournament was not sponsored and was unsanctioned by the BCA; in its absence being organized by
Irving Crane. It was denominated by newspapers, such as
The New York Times, as the "Unofficial World Pocket Billiard Championship." In a career highlight in the penultimate match there, Moore was losing 148 to 8 to
Irving Crane. When Crane let him back to the table, Moore ran 142 balls . Despite this feat, Moore was dispatched to second place by Lassiter, with a final score of 150 to 95, sharing second place with Crane. The defending champion, Mosconi, did not participate. Moore's runner-up streak continued in the 1956 World Championship held at Judice's Academy in Brooklyn, New York. He clinched second place, to Willie Mosconi's now almost ubiquitous first, with a 150 to 50 score over Al Coslosky of Philadelphia in 15 innings, a win over Richard Riggie of Baltimore, 150 to 121, with an inspired run of 107 balls, but a loss to Lassiter, 150 to 70 in 7 innings. That same year Moore played Mosconi at a challenge match in
Kinston, North Carolina. It was not Moore's day as Mosconi posted a career highlight; a perfect match—150 balls in a row in one inning. In all, Moore came in second at the World Championship four times but never took the crown. He did however win the National Pocket Billiards Championship held in Chicago at Bensinger's Billiards in 1958. The tournament was a challenge match, marathon straight pool to 3,000 points between Moore and Luther Lassiter. It was a tight competition, with Lassiter leading at one point 1,800 to 1,512. Moore battled back and eventually won with a final score of 3,000 to 2,634. Although Moore finished second several times in world competition he frequently competed with and beat all of the players whom he so often played second fiddle to in sanctioned tournament play. In fact, later in 1958, the same year he won the National Pocket Billiards Championship against Lassiter, he roundly defeated Mosconi in a two-day exhibition match in his home town of Albuquerque, with a final score of 500 to 397. In addition to competition, Moore served as a technical adviser for billiard-related scenes in television and film, including
My Living Doll starring
Julie Newmar and
Robert Cummings in 1964, and the Jerry Lewis movie
The Family Jewels in 1965. ==Later life==