Speaking to chelsea fans after the first leg, I vocalised that 1-0 probably wouldn't be enough for the second leg. To a man they disagreed with me. A couple thought Boro would score at the bridge and make it very difficult for Chelsea.
I don't think a 1-0 lead will be enough to see us qualify in 90 minutes. However, its 11 against 11. Chelsea have as many players missing as we do. The gap between us and chelsea isn't dissimilar to the gap between us and Rotherham. Make of that what you will. Will Chelsea think they are too good to lose? Maybe.
It will be important to frustrate in the first 30 minutes. If it is 0-0 after 30 then Chelsea will start to believe that we may go on and win. Doubts will creep in.
If we get 1 goal, it will be very difficult for Chelsea.
The percentage says Chelsea, it's 90 minutes, the maths don't matter unless you are thinking of a bet.