In 2007, Piorun won the Polish under-16 chess championship in teba. In 2009, he finished third in the World Youth Chess Championship. In 2010, he won the Rubinstein Memorial in Polanica-Zdroj. In 2013, he won the Polish Blitz Chess Championship in Bydgoszcz. In 2015, Piorun took clear first place at the 17th Open of Sants, Hostafrancs & La Bordeta in Barcelona and at the 19th Open International Bavarian Chess Championship in Bad Wiessee. He has also competed successfully in several Polish Team Chess Championships. He won the Polish chess championship in 2017 and in 2020.
Piorun played for Poland in the European U18 Team Chess Championship in 2008, winning two gold medals (team and individual on board 3), and 2009, winning the team silver.
Piorun is an excellent chess problem solver. In 2011, he won the individual World Chess Solving Championship in Jesi and became an International Solving Grandmaster as a result. Piorun won the world individual title also in 2014 in Berne, 2015 in Ostroda and 2016 in Belgrade. He won team gold with Poland at the World Chess Solving Championship in Jesi 2011, Kobe 2012, Batumi 2013, Berne 2014, Ostroda 2015, Belgrade 2016 and Dresden 2017 events.
During the 2018 Chess Olympiad in Batumi, he defeated the thirteenth best player in the world Hikaru Nakamura and claimed fourth place overall with the Polish team.
He tied for 3rd to 11th place in the European Championship (2019) with Ferenc Berkes, Niclas Huschenbeth, Sergei Movsesian, Niclas Huschenbeth, Grigoriy Oparin, and
In 2021 at the World Cup (2021) he first eliminated Rudik Makarian
1.5-0.5 then, he disposed of Jorden van Foreest and Javokhir Sindarov
also with 1.5/2, before beign eliminated himself by Etienne Bacrot 3.5-1.5. He was clear second with 6/9, behind Luke McShane 6.5/9.
Later that year at the European Team Championship (2021) he managed
5.5/9 on board 4.
(1) http://en.chessbase.com/post/poles-... & http://www.saunalahti.fi/~stniekat/...; Photo: http://www.bidmonfa.com/piorun_kacp...; (2) http://chess-results.com/tnr184474....
Wikipedia article: Kacper Piorun