How to set the trigger condition?

I want to set a trigger condition

"The football game has been to 30 minutes, and only one goal"
it means only one goal in 30 minutes!

When the first goal scored, I will lay one selection

How to set the condition?

 

Hi
Lay
Conditions:
Market's minutes since the off is greater than 30
and selection's trigger expression market_score1+market_score2 is equal to 1

This will lay when the game is at least 30 minutes and score is 1-0 or 0-1

Hi
Lay
Conditions:
Market's minutes since the off is greater than 30
and selection's trigger expression market_score1+market_score2 is equal to 1

This will lay when the game is at least 30 minutes and score is 1-0 or 0-1

Hi, MarkV
Thank u very much.
I will try to edit it. 

king regards
wins