We discuss what was arguably the best ever weekend of international rugby with Argentina, New Zealand, England and South Africa making it through to the semi finals. We analyse how those teams won and what the match ups are going to be like in the semis. We answer all the big questions like: Where can Ireland go from here? Why was New Zealand's defence able to shut Ireland down? Did France only lose because of poor refereeing? How will South Africa exploit England's weaknesses?