I have to admit, this is kind of scary. Just look at the title itself; It is long. But, hey, on the bright side, the punter only needs to focus on the first half of the game and especially the performance of the away team for the first half of the match.
You, the punter, needs to ask yourself the following questions if you really want to get your payout from this market. After that, try to look for answers to the same questions. The questions are: how has the away team being performing for the past few games? Does the away team have high-quality or standard players who can score goals before the elapse of the first 45 minutes of the game? What is the current status of the playground? How about the weather condition of that place?
I can assure you that when you answer all the above questions correctly, you will be a pro and be able to make the right decision when placing your bet on this market.
If whatever you are seeing from your bookmaker does not have even the slightest resemblance to the below market (in tabular form), chances are you are either betting on the wrong sports event or, your bookmaker does not offer such markets to their customers. Go back to the football tab on the bookmaker's website or, look for a bookie that offers this market to its customers. The top bookies you can work with can be Unibet, bet365, William Hill, BetVictor, and some more.
The tabular form
|Away Team odd/Even First Half goals|
|Odd (2.1)||Even (1.45)|
Now, this market does not have a 50/50 chance for the two options. This is because the determinant factor will be away team performance and also the home team defensive mechanisms. That is why the odds have a huge gap.