Jon Hamm squared off against young chess champs from new documentary “Brooklyn Castle.” Hamm and Jennifer Westfeldt hosted a VIP Soho House screening of Katie Dellamaggiore’s movie about students at Williamsburg’s IS 318, who’ve racked up 26 national titles despite having 60 percent of its pupils living below the poverty line. Boards were set up, and Rochelle Ballantyne, in line to be a chess master, was speechless meeting the “Mad Men” star — but then, “wiped the floor with him,” a spy said. The film’s out Oct. 19.
Jon Hamm and chess champs face off
