This book constitutes the strictly refereed post-proceedings of the First International Conference on Computer and Games, CG'98, held in Tsukuba, Japan in November 1998. The 21 revised full papers presented were carefully selected after two rounds of reviewing from a total of 35 submissions. The book addresses all aspects of computers and games, including game playing programs, mathematical games learning algorithms, social and cognitive aspects, and game theory. The papers are organized in topical sections on search and strategies, learning and pattern acquisition theory, and Go, Tsume-Shogi, and Heian-Shogi.