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Chess Ebooks Pdf Free Download9/17/2023 ![]() Finally, it is likely that fairly simple visual cues – such as a White pawn that has penetrated Black’s defence – direct masters’ eye movements to significant squares. This buttresses the hypothesis that masters perceive groups of pieces rather than individual pieces. Another interesting result was that masters fixated more often on the intersection of squares than the weak players. Masters’ fixations also covered more squares and landed more often on the squares that were important from a chess point of view. There were clear differences between weak players and masters, with the latter having shorter and less variable fixations. The data were fully analysed even later, in a book de Groot wrote with Jongman and myself (see Further Reading). The task was again to reproduce a chess position presented briefly, this time uniformly for 5 seconds. This technology was not available before the war when de Groot collected the data of his PhD research, and it is only in the 1960s that he was able to carry out such an experiment, with his PhD student Riekent Jongman. A natural way to study skill differences in perception is to record eye movements.
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