This felt like an very even match up until the end when my opponent miscalculated the pawn race and mishandled it giving me the win.

Was a fun match where I didn't make any game changing mistakes. I am pretty sure I could have played my d pawn better but the way I played it didn't lead to me being worse so it wasn't too big of a deal.

After b6, why not Rh1+ Kxh1 e1=Q+

Because after he played b6 I could queen without him stopping it. If I were to sacrifice the rook it makes it much harder to mate. The chess.com computer said I should have played Rb1 instead of where I put the rook, but it didn't make much difference.