I don't do trading, the 20seconds delay it was just to make a point to jjgold, of course bookies don't have a 20seconds delay normally they have somebody on the event that closes the market on the exact moment.
My point is that if you watch the game live on cable you can get big delay, which make impossible you to do live trading.
Just to be clear you will not beat a traditional bookmaker live, the market normally closes before you see the goal on TV.
The 20seconds delay I was talking it's between cable TV and analogue radio, not between TV and a bookie.
And yes there are still some people who try to beat the delay on tennis
https://m.youtube.com/watch?v=kvT_yIVI2Qw