Georg Mohr was born in Maribor, Slovenia in 1965 becoming a Grandmaster in 1997. He joined as a member of the FIDE Trainers Commission from 2002, becoming a FIDE Senior Trainer in 2004 and a FIDE International Organizer in 2011. Georg has been a professional chess trainer for many years. He was coach and captain of Slovenian national team from 2003 – 2010 and since 2011 he has been Turkish national youth trainer. He is a chess writer and was editor of Slovenian chess magazine Šahovska Misel from 1999 and editor of Fide Trainers Commission trainers’ surveys. He is also an organiser of chess events acting as tournament director of the European Club Cup (Rogaška Slatina 2011), the World Youth Championship (Maribor 2012) and the World Senior Championship (Bled 2018). This is his fifth book for 'Thinkers Publishing'. Born in Belgrade in 1973, Ana Velimirovic-Zorica exhibited a fondness for mathematics from an early age. She learned numbers and addition much earlier than letters and reading. Ana graduated from the Mathematics High School in Belgrade with excellent results. Following that, she pursued her education at the Faculty of Mathematics, specializing in Theoretical Mathematics and Applications. During her undergraduate studies, she maintained an average of 9.00, and during her master's studies, she achieved an average of 9.20. Mathematics has always been and continues to be her passion, although unfortunately, it is not her profession. Nevertheless, she has found a way to stay connected to it by successfully preparing students for admission to technical faculties at the University of Belgrade, as well as assisting students of the University of Belgrade in their exam preparation. Currently, she is employed as a leading reporting coordinator in the Tax Administration of the Ministry of Finance. In her daily work, she utilizes the latest information technologies. Outside of work, she is a devoted fan of art, sports, and nature. She is happily married and resides in Belgrade.