The still open Hirsch conjecture asserts that Delta(d, n) less than or
equal to n - d for all n > d greater than or equal to 2, where Delta(
d, n) denotes the maximum edge-diameter of (convex) d-polytopes with n
facets. This paper adds to the list of pairs (d, n) that are known to
be H-sharp in the sense that Delta(d, n) greater than or equal to n -
d. In particular, it is proved that Delta(d, n) greater than or equal
to n - d for all n > d greater than or equal to 14.