Context The UTMB(as it's more commonly known) takes place once a year on either the last weekend in August or the first weekend of September in the Alps, and follows the route of the Tour du Mont Blanc through France, Italy and Switzerland. It has a distance of approximately 166 kilometres (103 mi), and a total elevation gain of around 9,600 metres (31,500 ft). It is widely regarded as one of the most difficult foot races in the world, and one of the largest with more than 2,000 starters. It is one race during a week-long festival based around Chamonix in France. The races have strict entry and qualification requirements attained by accumulating enough race points through qualifying trail races over the previous two-year period. In 2016 and 2017, 42% and 34% of runners did not finish the UTMB race. While the best runners complete the loop in slightly more than 20 hours, most runners take 32 to 45 hours to reach the finish line. Most runners will have to run through two nights in order to complete the race. There is no prize money awarded. Since 2006, a second race Courmayeur - Champex - Chamonix (half-loop) has also been organised, and a third race was added in 2009: "Sur les Traces des Ducs de Savoie". A fourth shorter "running" event - Orsières - Champex - Chamonix - was added in 2014. La Petite Trotte à Léon is a non-competitive team event started in 2011. Each team is made of two or three members for safety. The route and direction of the course change every year. In 2015 it was run counter clock-wise. Content Today, the races consist of the following; UTMB: Ultra-Trail du Mont-Blanc (166 km +9,600 m) CCC: Courmayeur - Champex - Chamonix (101 km +6,100 m) TDS: Sur les Traces des Ducs de Savoie (119 km +7,250 m) OCC: Orsières - Champex - Chamonix (53 km +3,300 m) PTL: La Petite Trotte à Léon (approx. 300 km +28,000 m) MCC: De Martigny-Combe à Chamonix (40 km +2,300 m) YCC: Youth Chamonix Courmayeur (15 km +1,100 m) The Data set contains the list of runners who did the event(except for 2003). (source: wikipedia)