sentences:  Two weeks after the Derby, Tetratema was brought back to sprinting at Royal Ascot and won the Fern Hill Stakes by six lengths from the two-year-old Galway Castle.When tested over ten furlongs in the Eclipse Stakes however, he again failed to stay and finished unplaced behind the four-year-old Buchan, who won from Silvern and Allenby.Tetratema then reverted permanently to sprint distances and was never beaten again.