Lei was still playing very fast at this point.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6 In a world championship match, the Berlin is always to be expected. Nowadays it's considered the most solid and reliable way to meet the Ruy Lopez. 4. e1g1  4... f6e4  5. f1e1  5... e4d6  6. f3e5  6... f8e7  7. b5f1  7... c6e5  8. e1e5  8... e8g8  9. d2d4  9... e7f6  10. e5e1  10... f8e8  11. b1c3 [%c_effect c3;square;c3;type;Interesting;persistent;true] This pawn sacrifice is a fresh move, much less played than 11.c3, 11.Bf4 or 11.Rxe8+. 11... e8e1  12. d1e1  12... f6d4  13. f1d3 [%c_effect d3;square;d3;type;Interesting;persistent;true] An interesting and dangerous move, aimed against Black's idea of finishing development with 13...Ne8 followed by the advance of the d-pawn. 13... d4c3  14. e1c3  14... d6e8  15. b2b3 This position featured in two games from GM Van Foreest, a creative and respected theoretician whose games tend to be followed closely by the chess community due to its abundance of ideas in all phases. 15... d7d5 A new move, but hardly surprising. It's very natural and the first choice of the computer. 16. c1f4 The bishop changes its destination. 16... c8e6  17. a1e1 White has the pair of bishops and good piece play, but Black is a pawn up and has no weakness. The position is equal and the Berlin Defense survives once again. 17... d8d7 