When trades go bad, some people will say cut your losses immediately, others will recommend having a bit of patience as events tend to level out (i.e. games with two goals in the first 10 mins never end up with 18 goals in 90 minutes). This is something I like to do on certain matches.
1. You've backed Under 2.5 goals, trying to nick a few ticks at a time as the clock ticks.
2. You've been caught out by a goal.
3. The market has gone sharply against you.
On this particular match from a couple of weeks ago, there was an early goal (sixth minute) before I got involved. The period immediately after an early goal regularly shows a sharp drop in the Under price, so I was trying to capitalise on that. But Watford then scored again after 14 minutes. The Back price I took (3.95) was now out to 12 - I could close out for a big loss (not my style) or wait and wait for the price to come back to somewhere I could close out for minimal damage. But at 2-0 after 15 minutes, it was going to be a long wait - probably the 55-60 minute mark when the Unders would get back to 3.95. Too risky for me.
Enter Plan B. Have a little more on the Unders at the big price - in this case 12. Yes it's a bigger downside if there's another goal, but on the plus side, my average price on Unders rises significantly to 6.32, which turns out to be about the odds Unders was at HT.
The My Bets section is listed in time order, so hopefully you can follow what I've done. As the Unders price dropped, I've chipped away, a little at a time to minimise the risk while not ruining the overall price. As I've got close to the target mark of 6.32, I've kept some and laid beneath that price in order to claim a small profit - BEFORE the market has returned to the 3.95 level of my first bet.
This is just an example of what you can do on these markets when caught out. Take it or leave it, it's just putting an extra option in your armoury. It won't work every time. There is no such thing as a betting/investing/trading strategy that works every time. The sooner you realise that it's a hard grind like everything else in this world, the sooner you can contemplate making a modest return of trading.