Dutching

[vladilyich]

I sometimes dutch a few correct scores,as most people do on football games but Ive been wondering if there are any people who have reasonable success Dutching for example the over/unders,BTTS,match odds etc by setting up their trades pre match and letting the games run their course based on pre match research.

What are the magic odds so to speak to squeeze a profit out of the over/under 2.5 if you think the game will have a goal or two but it will be competitive or the match odds for example?
Ive found if you dutched and backed the over/under 2.5 with say a £10 and both touched the odds of 2.5 during the game then you would make around about a 20% return on that £10 stake. Is this correct and are those odds likely to be achieved if you select the right game?
I suppose this could apply to the BTTS market and other two way options also.

Anybody do this and any advice rather than just trading it in game?