Praggnanandhaa Rameshbabu caught Wesley So in the lead of the Sinquefield Cup with one round remaining after defeating Maxime Vachier-Lagrave in 27 moves. So drew Sam Sevian, leaving both players on 5/8. Vincent Keymer and Javokhir Sindarov are half a point behind after scoring wins on Tuesday, with Sindarov’s victory keeping his hopes of reaching the Grand Chess Tour Finals alive. | Photo: Lennart Ootes / Grand Chess Tour

