Custom URL scheme for Pinterest on iOS Safari to open board URL

Question

I can't for the life of me find out how to simply open a Pinterest board (by launching the APP if it's installed) through an anchor within HTML.

I've taken a look at: https://developers.pinterest.com, but still can't find what i'm looking for. It seems most of the documentation out there is geared more towards the action of pinning an item, rather than viewing.