Piorun Kacper (24.11.1991)

Polish Grandmaster and Solving Grandmaster (2011) who won five-time the World Championship in chess problem-solving. Polish Champion in 2017, Polish Rapid Chess Champion in 2018 and Polish Blitz Champion in 2015.

Best results: won or shared first at Rubinstein Memorial 2010, Sants Open 2015, Bad Wiessee Open 2015.

Peak rating: 2685 in 2016.