Although High Stakes Cheese Steaks bit the dust a few months ago and plenty of large storefronts nearby are sitting empty, there’s a cluster of new openings on or near this busy stretch Flatbush. On the corner of Dean and Flatbush, New York Chess and Game Shop recently opened. The store is advertising group classes for kids and adults, and it sells all manner of chess gear. A block away, on Bergen between Flatbush and 6th Ave., an Aveda salon is opening in the storefront of a rental building that was extensively renovated. Meanwhile, on the southwest corner of Flatbush and Bergen, the space next to Pintchik Hardware is once again transforming into a Halloween costume emporium c/o Ricky’s. Far as we know, Ricky’s will, like last year, only take over the storefront for the season.