Unfolding Mallarme proposes new meanings in Mallarme's poetry and seeks to promote the development of his poetic art as a successful search for linguistic and textual mastery. This development is systematically traced from Mallarme's earliest verse through to `Un coup de Des', the radically innovative poem which was about to be published in a fine-art edition at the time of his untimely death in 1898. In a series of close readings, Roger Pearson examines Mallarme's poetic output up to and including the central `Sonnet en yx', which is discussed both in its earliest version and within the context of `Plusieurs sonnets'. These readings are followed by analyses of other major sonnets, of `Prose (pour des Esseintes)', and of `Un coup de Des' itself. The `profound calculation' on which Mallarme claimed to have based this seemingly random text is here unfolded in all its structural and semantic complexity.