1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... a7a6  6. h2h3 It is extremely hard to guess what will Caruana choose against the Najdorf, but this modest-looking move seems to suit his style well.