Will you get over 2.00 on draw/ManC in-play?
It's 1.57 currently, probably not
I see now that they won't refund that "free" bet if it loses
So 10 on Arsenal (at 2.40) before the game wins 24
10 in play on Draw/Man City (at 1.57) in play wins 15.71
If Arsenal win, you've placed 20 (in play doesnt get refunded) and won 24.
If it's Draw/Man City you win 15.71 having placed 20 so lose money
..but how does that mean its free? Or am I wrong in the 2nd part and you'd win 5.71?