Wesley So remains the sole leader of the Sinquefield Cup after round four, holding a half-point advantage over his nearest rivals. The only decisive result of the day saw Praggnanandhaa Rameshbabu defeat Jorden van Foreest, handing the Dutchman his third loss of the event. Pragg consequently joined Maxime Vachier-Lagrave and Levon Aronian in the chasing group, half a point behind So. | Photo: Lennart Ootes / Grand Chess Tour