GM Jon Speelman returns to the theme of opening preparation in the computer era, examining how engine-assisted novelties can unsettle even the strongest players. His examples begin with Fabiano Caruana's preparation from the recent Grand Chess Tour final, before moving to an earlier attacking idea by Hikaru Nakamura and, finally, the famous gambit introduced by Frank Marshall (pictured) against José Raúl Capablanca in New York in 1918.