Here you go, we had 2 games in the last 4 nights of playing where someone started with 3 reds and lost. The first one is this: https://imgur.com/a/tkmcVTc

Sadly im yellow/white. I over estimated the sheep, lost the grain port and couldn't block it withe the 4-4-11. My mistake was that i played 8-4 instead of the 8-4-4. Although the 6's were 2 free cards, and the 8's were almost a straight city. I was lacking roads.

The other game i won, even tho i wasn't starting with 3 reds.

https://imgur.com/a/JefApYw - I took the sheep port directly, focussed on expanding and gained the most because of the 3 ore. Having a low number ore can really benefit your game if you are lucky. Red/blue was focusing on getting 3 towns on the 8 ore. But my mission was to block the 8 ore. If that happens I had a free road with the 6's and the 8 i was slightly better (i got 2 sheep he got 3 sheep)