Grandmaster is Expii’s latest learning innovation. We have created a learning algorithm that will adapt, measure, and rate user comprehension across topics in relation to problem difficulty. Our innovative algorithm and adaptivity is grounded in mathematical theory and adjusts with every user and every problem solved to give real time insight into the mastery of topics. This scoring system is transparent and based on Elo, where each problem and each learner has a rating that is refined as more users complete more problems.