Started with my guide Michal Sekelsky at 4 in the morning from the Hörnli hutte. Tired after no sleep in the hut. Around 30 people in total started to climb. Reached Solvay hut within 2- 2,5 hours during the sunrise, and put on the crampons at the start of the fixed ropes. Used no axe after the fixed ropes near the summit. Cloudy weather but on the way down the sky cleared up a bit. Drank 2 liters of water and 1,5 l Coke! and had a bar and a sandwich at Solvay hut on the way down. It took me 4,5 hours up but around 6 hours down. Exposure on the ridge and tired knees is one explanation. The climbing up was very fun and varied. This summit is a great achievment for me. Fantastic feeling at the top!