Tag Archives: 3-4

3-4 or 4-3 Under?

What’s the correct name for the 49ers’ base defense: 3-4 or 4-3 Under? If you’ve never heard of the 4-3 Under, click here to read a detailed explanation of it. The article says George Seifert used the 4-3 Under when he was the defensive coordinator for the 49ers. His defense looked like a 3-4 because […]