The most  solid, classical choice.
1. e2e4  1... c7c5 In a must-win situation, Ding naturally switches to the Sicilian defense. 2. g1f3  2... d7d6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... b8c6 