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In rugby, except for a couple of lines on the field, one inch doesn't strictly matter more than another, within the bounds of the rules.

In american football, one inch anywhere on the field can make the difference between four more downs or having to kick the ball away.

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Rugby also has the method of tackling baked into the rules. If you tried to tackle in rugby in the same way as a block in NFL you'd immediately be penalised and could see yourself off the field. A typical rugby tackle almost by its definition in the rules will cede a metre or so to the attacking player as they are brought down to set up the ruck. IIRC Pete Carroll of the seahawks has taken advice from rugby professionals to help the d with their method of tackling

Reference? I always like to see these cross pollination stories, but I need a source on this one. The rugby way of tackling is the same as the way you are taught in Pop Warner and the way you do angle tackle drills, I thought.

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