Pal Benko, twin problem, helpmate in 7

Sometimes a helpmate problem, especially in a longer move setting, need not be a serious affair. There is a pretty picture in this helpmate which is a twin (a nearly identical position), the stipulation being, to remove the bishop at h4 in the last diagram. Here, also, we have a pawn promoting all the way from second rank, under-promoting, else the black king scampering to h1 would be in check. The long journey undertaken by a promoting pawn in chess problems is called Excelsior.