Carlsen, Magnus – Xiong, Jeffery

2863 2020 · White wins (resignation, time or agreement)

Carlsen (2863) against Xiong (2709), 2020: a London System that turns sharp fast. Black gives up the dark-squared bishop, White recaptures on e3 and rolls forward with 12.h4 and 13.h5. The hinge is move 14: 14...e5 is the missed chance, the evaluation sliding from −0.6 to −3.3. Carlsen gives some back with 21.Nh7 (+4.8 to +3.0), but 21...Rfd8 (−3.0 to −5.3) and then 22...Kf8 (−5.7 to −12.9) settle it. Accuracy: 96% for White, 83% for Black. The takeaway: once your structure is already loose, opening the centre at the wrong moment costs more than any gift your opponent hands back.