Calculating variations, assessing positions accurately and finding the best move at the critical moment: few aspects of practical chess pose a greater challenge to players than concrete calculation. Robert Ris first addressed this topic in his 2018 Fritz Trainer, "Calculation Training", laying the foundations for a series of further courses. Lukas Koepl has taken a closer look at the various training programmes and, in this multipart overview, explains the main focus of each course and who they are particularly suited to.