Marcel Duchamp was both an artist and a chess player, but until now, little was known of his chess activities. In analyzing Duchamp's games--seeing how he reacted in specific situations during play--we can better understand how his mind worked, and gain insight into the strategies that motivated his work as an artist. Duchamp saw a correlation between art and chess, and actively sought opportunities to combine the two seemingly unrelated disciplines. Not only did he love the game, but he was aware of the reputation of chess as an intensely cerebral pursuit, and to the end of his life, he remained committed to challenging the French adage "d'être bête comme un peintre" ("to be stupid like a painter"), raising his art to equivalently complex, intellectual heights. Naumann shows us just how deeply intertwined the two activities were for Duchamp.