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Abstract
One current research strategy in the study of expertise is to compare experts and novices. An important aspect of decision making involves looking for similarities among problem types. Little is known about such processes. We used grid technique to examine similarity judgments associated with different levels of chess expertise. Novice, expert, and master chess players evaluated 4 sets of 12 chess boards. Average FIC scores showed a curvilinear relation to expertise, suggesting increasing differentiation followed by integration in cognitive frameworks for construing board positions. Additional cognitive measures based on move generation tended to support and extend this structural model.