By Broadway standards, the intimate Helen Hayes theatre might be considered the Main Stem's version of an eight foot by eight foot platform, so Dames at Sea's premiere Broadway production is also a tiny affair featuring six actors with more or less equal-sized roles. Anna Louizos' fine set changes at intermission, but stays just the way it is for each of the two acts. There are no dark moods in Ken Billington and Jason Kantrowitz lighting and director/choreographerRandy Skinner's staging plays out to the house. Under such conditions, actors have no production values to cling to.Dames at Sea offers only one special effect. Talent. Lots of it. And it's right smack in the middle of the stage for all to clearly see.