Now in its 57th year, CHI Geneva (December 7 – 10, 2017) is one of Europe’s premier indoor shows, housing not just one of the four Majors of the Rolex Grand Slam of Show Jumping, but also world-class dressage and combined driving competitions. Since 2014, the show has also offered a rare indoor eventing class and the only one of its kind in Switzerland.

This year’s event brought together 16, talented, international competitiors to tackle the 1,800-meter-long course, which spanned across two arenas and consisted of 29 natural obstacles, including a lake and a bank. This year’s class went to France’s Karim Florent Laghouag & Punch de l’Esques, while world #1 Michael Jung, aboard the 7-year-old Corazon, finished second (impressively, the German eventer, who moonlights as a five-star showjumper, also finished 11th in the Rolex Grand Prix aboard fischerSolution!). Sidney Dufresne of France and Looping de Buissy took third.

In the gallery above, photographer Thomas Reiner showcases all the high-drama, skill, and nerve required by this one-of-a-kind annual event.