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#Walter korn modern chess openings update#
One important and welcome update over earlier editions is the incorporation of algebraic notation, making the book useful to a wider range of readers. The result is MCO-13, a grander, fully revised and greatly expanded version of this classic work. With this 13th incarnation, Korn took the role of editor and put the update in the capable hands of International Grandmaster Nick De Firmian. Modern Chess Openings, better known in the chess world as MCO, has been called "the chess player's bible" since it was first produced by Walter Korn almost 60 years ago.