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It's definitely a 1 round force, but it's a mistake to call it 'third suit forcing'. Third suit forcing in that sequence is 2♦.

I play with a keen inexperienced partner once a month with the aim of helping her progress. I try to give her advice if there is anything obvious that I can pick up on where she could have done better. Earlier this year there was a hand where I led a high spot card to give her a ruff which was signalling for a spade return and she didn't pick up the signal, so I went through this type of signal with her afterwards. A hand came up yesterday where I used this signal and she picked it up immediately which resulted in an excellent defence: [hv=pc=n&s=s74hk9843djt872c3&w=saqt8h765dk93ct98&n=s93ha2d654cakj642&e=skj652hqjtdaqcq75&d=e&v=0&b=14&a=1sp2s3c3sppp&p=c3c8ckc5cac7d2c9cjcqs4cth4h5hahth2hjhkh6h8h7s9]399|300[/hv] That was worth 5/8 MPs. It is satisfying to teach someone a concept which they haven't come across before and they are able to understand and apply it a considerable time later.

This sequence came up today and 2♥ was described as: 4-6♥; 5+♠; HCP 9+; 3rd suit forcing; looking for stopper, can have fit and at least 4♥ - Forcing. [hv=d=e&v=e&b=6&a=1cp1sp2cp2h(3rd%20suit%20forcing)]133|100[/hv] Not being familiar with 3SF I looked it up and found a Funbridge blogpost which seemed likely to be authoritative given it's Argine. The title of the post was "The truth about the subject of third suit forcing" suggesting that it was not a lie. The post stated that "The next three sequences use a third suit that is outside the box that defines a third suit forcing:" The second of these auctions is the one shown above. This is described as "Without going into detail (this is not the topic of the day), these third suits have a tendency of being natural:" Any thoughts?