The GCT Saint Louis Rapid & Blitz kicks off tomorrow with ten of the world's sharpest tacticians in blitz format. Caruana, So, Giri, and Praggnanandhaa lead a loaded field that includes rising star Keymer and the dangerous Aronian. Round one starts at 5:05 PM ET, and these players will battle in 5-minute games with increment. The blitz segment moves fast. Mistakes punish you instantly. Watch for So and Caruana to clash early.