Well played!
1 move puzzle and analysis of the variations

Little update, I just found out this move somehow crashes chess.com analysis: not only chess.com analysis says the position is -3.6, while local analysis (which I think is more reliable because it can reach potentially unlimited depth) says the position is -5, but it also says Rg3 is better, when it's between half a point and one point worse. And, lastly, the line chess.com suggest is evaluated -6... Once I'll reach depth 45 with the analysis I'll send a picture. Can anybody help me to solve this?
Here's the mainline.