A new approach examined two aspects of chess skill, long a popular topic in cognitive science. A powerful computer‐chess program calculated the number and magnitude of blunders made by the same 23 grandmasters in hundreds of serious games of slow (“classical”) chess, regular “rapid” chess, and rapid “blindfold” chess, in which opponents transmit moves without ever seeing the actual position. Rapid chess led to substantially more and larger blunders than classical chess. Perhaps more surprisingly, the frequency and magnitude of blunders (...) did not differ in rapid versus blindfold play, despite the additional memory and visualization load imposed by the latter. We discuss the involvement of various cognitive processes in human problem‐solving and expertise, especially with respect to chess. Prior opposing views about the basis of general chess skill have emphasized the dominance of either (a) swift pattern recognition or (b) analyzing ahead, but both seem important and the controversy appears currently unresolvable and perhaps fruitless. (shrink)

This article offers a preliminary analysis of Vygotsky’s theatrical reviews from his Gomel period against the background of Russian theatrical history. For several years Vygotsky published theater reviews of performances by local and travelling companies in the local newspaper. His writings show him to have been a very knowledgeable and demanding theater critic who knew both the Russian-language and the Yiddish theater perfectly well. Some parallels with his later psychological works are suggested.

Duruor rounds are a central aspect of calculating moves in a group of mancala games. It is shown that the ability to calculate multiple duru is a prerequisite to mancala expertise in Zanzibar, while duru-related optimization strategies explain the accomplishments of Maldivian mancala players. Since bao masters define duru calculation skills as part of bao expertise, their performance on duru calculation tasks is contrasted with that of novice players. The results show that only game-specific duru calculation skills distinguish novices from (...) master players. Maldivian players of ohvalhu solved their mancala game by identifying a winning opening. Their optimization strategy includes a minimization of the number of duru for a move choice. Duru calculations have a central role in our understanding of mancala expertise and both game-specific and general aspects of duru inform us about problem-solving and decision-making processes of mancala experts. (shrink)