Born in 1988, Robert Ris is an International Master who has represented The Netherlands in various international youth events. Nowadays his main activities in the Amsterdam area consist of teaching in schools and chess clubs as well as coaching private clients. On top of that, he is also an active online trainer with a number of students from a host of different countries. Robert has made several appearances as a live commentator for prestigious events, such as the Dutch National Championships 2011-2013 and the Tata Steel Chess Tournament in 2013 and 2014.

Calling all ambitious players who are up for improving their calculation skills! In Calculation Training - Sharpen Your Game! a total of 73 examples have been selected, the vast majority containing multiple questions, and more than 160 questions of varying difficulty. The course kicks off with some relatively simple tactics (max. 1-2 moves) featuring well-known tactical motifs discussed on earlier video courses of the Calculation Training series. But then the difficulty level increases! Short forcing variations must be calculated very precisely, and opponent's errors need to be refuted.In ''Spot the Weakness'', it helps to first determine which specific point needs to be targeted before looking at concrete moves. In the sections ''Defend'' and ''Brainteasers'' you will need a bit more time coming to the right conclusion, as even some of the World's best players have failed to deliver! The material is based on recently played games, as well as unpublished games by the students of the author, so likely you will be as yet unfamiliar with most of the exercises. Thanks to the interactive format, the exercises are suitable for players of any level. Step by step, the viewer will be guided through all the examples, as advanced players are likely capable of visualising positions from afar, while newbies have the possibility to take a fresh look at every new question.- Video running time: more than 5 hours (English)- With interactive training including video feedback.Including download & stream for iPad, tablet etc: can be unlocked with imprinted keySystem requirements: Minimum: Pentium III 1 GHz, 1 GB RAM, Windows 8.1, DirectX9 graphic card with 256 MB RAM, DVD-ROM drive, Windows Media Player 9 and internet connection for program activation. Recommended: PC Intel Core i7, 2.8 GHz, 4 GB RAM, Windows 10 or 11 , DirectX10 graphic card (or compatible) with 512 MB RAM or better, 100% DirectX10 compatible sound card, Windows Media Player 11, DVDROM drive and internet connection for program activation.