Reaction between [(PMe 2 Ph) 2 PtB 8 H 1 2 ] and anti-B 1 8 H 2 2 in benzene results in intimate cluster fusion to generate [(PMe 2 Ph)PtB 2 6 H 2 6 -(PMe 2 Ph)] which consists of a nido eleven-vertex {PtB 1 0 } subcluster fused, with a {PtB 2 } triangular face in common, to a second nido eleven-vertex {PtB 1 0 } subcluster, which is fused in turn to a nido ten-vertex {B 1 0 } subcluster with a {B 2 } edge in common.