The child chess champions in the irresistible documentary “Brooklyn Castle” don’t take long, as one of these sweetpeas likes to say, to crush you. Year after year, these big brains and little bodies at Intermediate School 318 in Williamsburg win chess tournaments, and their winning streak continues on screen. They are a remarkable, funny, inspiring, at times devastating group. Through the eyes of the director Katie Dellamaggiore, you come to know these children, their teachers and parents as you witness their pulse-quickening matches and tears splashed on the family dining-room table. There’s smiling uplift here, but the road is seldom easy and sometimes brutal......

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