Only the fifth most popular move, but Caruana has tried it last year.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. c2c3  4... g8f6  5. d2d3  5... d7d6  6. b2b4 [%c_effect b4;square;b4;type;Interesting;persistent;true] Another of the many possible attempts in the Italian, an opening very rich in strategic ideas. Some strong GMs tried this move recently. 6... c5b6  7. a2a4  7... a7a5 The natural reaction. 8. b4b5  8... c6e7  9. b1d2  9... e8g8  10. e1g1  10... e7g6 By far the most popular move.