I am very happy that I found Boris web page, since I always struggled in the openings. For my level 1900 his advanced files are working really great, it's helped to increase my rating by a lot. I am looking forward to see his new work. I will definitely get the material, it's worth it!
I worked with Boris since 2011 and he was integral in helping me eventually making the Grandmaster title. He taught me how to systematically build my opening repertoire without making it obsessive and paid a lot of attention to detail. The products in this site demonstrate that care to detail. Thank you for your work, Boris!