With 139 matches played, Kotner is an experienced Age of Empires II player. Kotner excels with Britons (32.7% wins over 52 matches) and on Black Forest (38.8% over 49). Kotner has never tried ranked but wins 46.2% of the time as pocket.

A Czech player, Kotner is active in unranked with a 98.6% pick rate for Britons.