Family fork exploiting a powerful pin!

Today I was not at home and played many unrated rapid games using my mobile. I do not want to play rated games on mobile due to the increased misclick danger... At some point I played a rapid game against a 1900 player and blundered mate in 1... without my will it was rated... and I lost the 1900 rating... When I got back home I decided to play a rated rapid game. The opening was a mess, the position complicated and the accuracy low: 70% for me, 60% for my opponent. However, despite being two pawns down I had an active position and on move 18 I found a winning FAMILY FORK exploiting a powerful pin! which my opponent had missed... After this killing tactic my 1900 opponent resigned.

I broke the 1900 barrier again...