A talk about automated exploratory testing based on Petri net models for HeisenBug Piter 2018 (https://2018.heisenbug-piter.ru/talks/2018/spb/6feubdtqqwqocya2w4cwq2/). The recording of the talk is available on YouTube (https://www.youtube.com/watch?v=TeKHZw61pb8).