We investigated the role of practice in the acquisition of chess expertise by submitting a questionnaire to 104 players of different skill levels. Players had to report their chess rating, the number of hours of individual and group practice, their use of different learning resources and activities, and whether they had been trained by a coach. The use of archival data enabled us to track the rating of some of the players throughout their career. We found that there was a strong correlation between chess skill and number of hours of practice. Moreover, group practice was a better predictor of high-level performance than individual practice. We also found that masters had a higher chess rating than expert players after only three years of serious dedication to chess, although there were no differences in the number of hours of practice. The difference that may explain the variation in rating is that masters start practising at an earlier age than experts. Finally, we found that activities such as reading books and using computer software (game databases, but not playing programs) were important for the development of high-level performance. Together with previous data and theories of expert performance, our results indicate limits in the deliberate practice framework and make suggestions on how best to carry out learning in chess and in other fields.Learning high-level cognitive skills such as those of senior scientists, virtuosic composers, and chess masters typically requires one to acquire a vast and meaningful knowledge base and engage in situations in which this knowledge base is used. For example, senior scientists should acquire knowledge of the results, theories, and methodologies related to their field of research by reading scientific journals; virtuosic composers should acquire knowledge related to previous compositions with their different styles by reading scores and listening to masterpieces; and chess masters should acquire knowledge of previous master games by replaying them. Moreover, they all have to use their knowledge in performance situations. For example, senior scientists have to design experiments, carry them out, analyse the results, and write reports; virtuosic composers have to create music; and chess masters have to play games. Participating in these situations reorganises the knowledge base and incorporates new information to it.Research into the acquisition of high-level cognitive abilities has raised a number of issues that are still waiting for a definite answer. Probably the first and most debated of these issues is whether the acquisition of high-level skills is only a matter of the amount of dedication to the domain of expertise or whether innate factors are involved as well. This debate has two extreme views: the first states that talent is the main factor (Galton, 1869(Galton, / 1979, and the other maintains that all skills are acquired through the interaction with the environment (e.g., Watson, 1924). Ericsson, Krampe, and Tesch-Romer (1993) have revived the latter view with t...