In the
Tatra Mountains, Tekieli climbed about 300 climbing routes, in particular most of the most important mountain walls, albeit alone. In 2010, Tekieli was a participant in the Polish Winter Himalaism 2010–2015 program. As part of this project, he took part in expeditions to
Makalu and
Broad Peak Central.
Nevada and Alaska, and also the fastest diretissima of the northern face of the
Mięguszowiecki Szczyt Wielki. On 18 October 2018, he climbed the porch pillar and both pillars of Rumanowy Szczyt in this way in seven and a half hours, and it was a project he had been working on for a long time. On 5 July 2019, together with Łukasz Mirowski, in a record time of 15 hours and 52 minutes, he defeated the Expander by Krzysztof Pankiewicz, a Tatra chain, connecting climbing routes with grade 6–7, on the walls of Mały Młynarz, Kotła Kazalnica Mięguszowiecka,
Mnich and
Kościelec. During this period, Tekieli also remained involved in Himalayan mountaineering to some extent. In autumn 2016, he also took part in the tragic expedition to
Shivling, where he carried out a difficult rescue operation, in which together with Paweł Karczmarczyk he reached the mortally wounded Łukasz Chrzanowski and tried to help him. The following year, Tekieli declined the invitation to the Polish winter expedition to
K2 and instead went to the mountains of Scotland, where he led new climbing routes with Sandy Allan and
Andy Nisbet. In summer 2018, he organized an expedition with Allan, Rick Allen and Stanislav Vrba to create a new route to
Broad Peak, which ended in failure after two dangerous accidents. First, Rick Allen fell from a considerable height during a solo reconnaissance. He was found and saved thanks to an innovative action using
UAV (the first in the history of Himalayan mountaineering). Then Stanislav Vrba suffered a serious leg injury as a result of a rock chipping while climbing. Tekieli managed to abseil with him on a rope to the base of the wall, from where, together with other climbers, he carried the injured man through the glacier to the base. In 2019, Tekieli achieved further significant successes in the mountains of Europe. In addition to the aforementioned
Expander, on 4 August, as the fourth or fifth in history, he made a double traverse of the Matterhorn (crossing all four ridges with the top being reached twice in one mountain action), and on 13 November, alone and without using a rope, the north-east face of the Eiger by the Lauper route; both passes were noticed by the international media. In the same year, he marked out and completed three new climbing routes in central Norway, collaborating with Michał Czech, Jan Kuczera and Wadim Jabłoński. On 13–14 August 2020, Tekieli climbed all the peaks of the Great Crown of the Tatra Mountains in 37 hours and 28 minutes, improving the previous record by over 11 hours. On 2–4 March 2021, he returned to Expander with Maciej Ciesielski and Piotr Sułowski, making the first winter ascent (43 hours and 50 minutes of continuous mountain action in deep snow)—such an undertaking was previously considered impossible and they became pioneers. For this ascent, they received the Kraków Mountain Award 2021. ==Personal life and death==