Look closely at the link you posted and you will see that he was right, in the 1st half the game ended 2-0 and in my opinion OP's challenge is not impossible to achieve.
The funny thing he wrote the first half was 1-0 under 1.5 goals, isn't that the @OP win too? 
Honestly I'm surprised how @OP is sure with his bet, predicting the first half is harder than predict the end results. Definitely we need to congratulate @OP, the first bet went well, let's see what the second bet @OP will bet.