How does Russia fail to take the Black Sea here?

[Swash]

Hi, playing in my first online Diplomacy game and I can't figure out how this particular move failed. Here are screenshots of the map before the orders, the orders, and then the map after the orders: https://imgur.com/a/o9v67bN

As I understand it, Austria dislodges Turkey's army in Bulgaria, so Bulgaria support move from Black Sea to Rumania is cut. That leaves the two-to-one of Rumania to Black Sea (with support from Sevastopol).

Please let me know if you see something I don't - I can't figure it out!

[PiC]

It looks like Sevastopol supported the Black Sea to Rumania based on the support arrow. I am pretty sure you cannot support an attack that dislodges your own unit but I might be wrong.

[mhsmith0]

That's exactly correct. Sev support Rum-BLA woudl have succeeed, but Sev supports BLA-Rum was a mis-order and was ignored b/c you can't dislodge own unit.

[jay65536]

Seems like a good chance OP knows this already, but perhaps worth pointing out is that Bulgaria's support would still have been cut even if it was not dislodged--the attack from Serbia automatically cuts support into any territory except Serbia.