Has there ever been a 15–6 in all competitions?

Never.

It would be a scorigami. Based on the average number of goals in all competitions, the chance of a game ending 15–6 is about 1 in 2,831,396,136,189.

Nearby scores

1. 16–5 Never
2. 16–6 Never
3. 16–7 Never
4. 15–5 Never
5. 15–6 Never
6. 15–7 Never
7. 14–5 Never
8. 14–6 Never
9. 14–7 Never