I think something 's wrong with the engine evaluation:
I played 1..Rxh2 2. Rd3 Rxd2 3.Rxd2 with the intention of 3.. Bf4 and got marked wrong even though I do win the pawn and the exchange exactly as the line in the solution.
I 'm sure this position is totally winning. I thought that it would be best not to let white fix it's pawn structure, not that it matters too much anyway...
Too shallow engine depth?