Just a quick note, it’s not 2.85% but 1/(36-9) = 1/27 ≈ 0.037 = 3.7%.

As a fun fact, larger boards like that were possible to create on that site (e.g. 30x30 with 898 mines) and some even had wins. Now I can’t even search for them in “ranking”.

Not actually hard to beat. Just click twice until you get lucky ;) https://minesweeper.online/game/2553911974