the first race for professionals was held, and the average speed rose from to . Houa concluded his third win, by seven minutes over Rasquinet. Frenchman Maurice Garin, who would later become the first winner of the Tour de France, finished fourth. After the inaugural three editions, the race was not organized for another 14 years, after which it was sometimes open only to amateurs and semi-professionals. The race was resumed in 1908, with a start and finish in Liège for the first time. It was won by Frenchman André Trousselier. In 1909 the winner, Eugène Charlier, was disqualified because he had changed bikes. Victor Fastre was declared winner. The event was cancelled during World War I but resumed in 1919. The race was mainly won by Belgians, but started to attract more riders from Flanders, the bike-crazed northern part of Belgium, who began to dominate the event. Fleming Alfons Schepers gained three victories in the Interwar period. Ardennes Classic Liège–Bastogne–Liège had some interruptions during World War II, but was again a calendar-fixture as from 1945 and began to attract some of the stars of European cycling. In 1951 the race was added to the Challenge Desgrange-Colombo, the competition that combined cycling's greatest races at the time. Swiss Ferdinand Kübler won the race in 1951 and 1952. Belgian favourite Raymond Impanis became the race's eternal runner-up, with four second places but never a victory. In the late 1950s Fred De Bruyne won the race three times in his first three participations, equalling the former record of Houa and Schepers. In 1957 two riders were declared winner. Germain Derijcke was first over the finish line, but he had crossed a closed level crossing. Derijcke had won by a three-minute lead and judges felt he had not gained that much time from illegally crossing the railway, thereby not disqualifying him. Officials compromised to promote second-place rider Frans Schoubben to first as well. In 1959 Liège–Bastogne–Liège became part of the Super Prestige, successor of the Desgrange-Colombo competition and early precursor of the UCI World Tour, making the Ardennes Classic one of the main cycling events of the year. In 1969 began the era of cycling icon Eddy Merckx, who gained five victories, three of which consecutive, and a total of seven podium finishes. The 1971 race was run in appalling conditions, with snow and cold ravaging the peloton. Merckx gained one of his