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'GHI,LargeCV': Eight piece-types. Gryphon is Arabian mythological 'bird so big it can lift elephants'. Lion is modern Trebuchet(0,3). Alfonso manuscript(1283) pre-dates Chaucer by about 100 yrs. and also widespread introduction of gunpowder into Europe from works of Arabs, who had learned it from the Chinese. Concurrently Alhazen's 'Optics' was translated into Latin and reached Europe in 1270. Gryphon starts one diagonal and can proceed Rookwise outwardly. Unicorn is Knight one move, then Bishop thereafter. Giraffe(1,4); Crocodile as Bishop; Rook; King mediaeval with initial leap option. Promotion to file piece as in Chaturanga. Chessically, Grande Acedrex precedes Timur's Great Chess(11x10), also called Tamerlane Chess(Timur the Lame). Timur's 'Giraffe' differs from G.A.'s Giraffe. In historical timeline, the three markers (gunpowder, Chaucer, and Timur's Chess) come within the century after invention of Grande Acedrex.