The Ris: Calculation Training from Chess Base is an interactive chess training program aimed at improving the calculation skills of chess players. With a total of 73 carefully selected examples that include more than 160 questions of varying difficulty levels, this training offers a comprehensive way to sharpen one's tactical abilities. The exercises start with simpler tactics and gradually progress to more complex scenarios that require precise calculations and strategic thinking. The content is based on recently played games as well as unpublished games from the author's students, meaning that most exercises are new and challenging. The interactive format allows players of all levels to engage with the materials and develop their skills step by step. The total runtime of the videos is over 5 hours and provides additional feedback on the exercises.

• Interactive exercises with over 160 questions of varying difficulty levels
• Based on current and unpublished chess games
• Step-by-step guidance for players of all levels
• Comprehensive video runtime of over 5 hours
• Focus on precise calculations and strategic thinking.