Harachaman in birkas hamazon on shabbos

What is the Rav position on saying the harachaman part at the end of the birkas hamazon on shabbos ? As it could be seen as problematics bakashos should we say them, skip or partially skip ?

The Rav skips them on shabbos.

even the bracha for the host ? it is quite often the only time we could say it…

If you really want to say it or if the host expects it, you can