There was an amusing comment related to this over on the Metafilter thread on this earlier today which included this impressive detail:

Naturally, we did what any self-respecting half-in-the-bag Americans would do upon meeting so-called champions of the rock-paper-scissors arena on the streets of a foreign nation, and challenged them to a duel on the spot. We proceeded to go a spectacular 0-24 against our fellow countrymen, before realizing that maybe there's more to the metagame than we had previously considered.

https://www.metafilter.com/181225/Iocaine-Powder#7714208

Any competitive RoShamBo players here willing to share their metagame strategies?