This course teaches play in key opening positions in Scotch game (1.e4 e5 2.Nf3 Nc6 3.d4) and Petrov Defense (1.e4 e5 2.Nf3 Nf6). These openings have been played by nearly all of the greatest chess players in the world, including Karpov, Kasparov, Kramnik and Anand. In these openings, the cost of a mistake is high, and it is necessary to know or be able to find the only correct move. By solving the exercises in this course, you can better understand the subtleties of these openings and avoid mistakes in key opening positions during actual games.