Yaya's goal last night

This is how I remember it.
Kolarov took a corner and an Aris player headed it out and it fell to Yaya.He then shot and the ball was going towards the goal and their goalie started of diving towrds it.The ball then took quite a large deflection and changed direction and ended up in the net with the goalie going the wrong way.
It seemed as there was a large slice of luck involved in this goal which originated in a set play.However some of the experts on the site have told me that luck has nothing to do with it and its cos we are shit at set pieces this is the reason why apparently we never score from them.
Silva's goal against them was a result of a defelection aswell and I think there was an element of luck in that but as the experts have told me luck has fuck all to do with any teams play so I am confused as to how these events could have happened.
Kolarov took a corner and an Aris player headed it out and it fell to Yaya.He then shot and the ball was going towards the goal and their goalie started of diving towrds it.The ball then took quite a large deflection and changed direction and ended up in the net with the goalie going the wrong way.
It seemed as there was a large slice of luck involved in this goal which originated in a set play.However some of the experts on the site have told me that luck has nothing to do with it and its cos we are shit at set pieces this is the reason why apparently we never score from them.
Silva's goal against them was a result of a defelection aswell and I think there was an element of luck in that but as the experts have told me luck has fuck all to do with any teams play so I am confused as to how these events could have happened.