When you have decent striker, Wayne Rooney, Michael Owen etc. get clear of the opposition's defense (sprint past or one-two some one) and walk towards the goalie.
If the goalie comes out good, but if not keep walking.
Once he comes he will slide. Go for a right turn, kick the ball towards side of his feet.
You will either take take the keeper on and succeed or you will get a penalty and the keeper a red card!