It's funny how we seem to have more chances and goals when The Duck is playing. You seem not to realize that many goals are created by strikers themselves. It's relatively rare for goals to be scored on a plate, which it seems how you define a "chance". I am sure if you look back at the goals we have scored this season, you would not have classed them as "good chances" if they had not actually gone in the net.
How about the Mansfield goal yesterday? Would you have called that a chance if it had missed or been saved? No, I don't think so.