International Chess School offers a comprehensive Grandmaster Package, which is a structured 13-month chess course focused on high-performance training. The course is accompanied by unlimited coaching support, with professional chess coaches available to answer questions at no additional cost.

The Grandmaster Package is designed to be a complete chess training program, extending over one year along with a bonus month. The program requires around seven hours of study and training each week. However, the school allows flexibility by providing lifetime access to student accounts, course materials, and continuous support from coaches, allowing students to learn at their own pace.

The course materials provided are designed to gradually increase in complexity, thus offering a comprehensive training for master-level chess play. The lessons begin with 'Think Like a Strong Player' as an introduction, followed by the first chess lessons on 'Chess Strategy' and 'Chess Tactics'. These lessons and all subsequent ones are provided in PDF format. This format allows students to use a chess board for their study, making the learning process more effective and enjoyable.

In aligning its teaching approach with recommendations from industry experts, the International Chess School follows World Chess Champion Garry Kasparov's advice to use a physical chess board for solving problems, instead of a computer screen.

In conclusion, the International Chess School's Grandmaster Package offers a robust and comprehensive training program for those looking to excel in chess at a high performance level. The added flexibility of lifetime access to the course and the convenience of readily available professional coaching support round off a well-structured and approachable course for any ambitious chess player.