Ruy

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Kxg

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O

 

Ok, I've read about this in several books but neither of them explains... How comes the e4 pawn is safe?

SharpChris

Even if black takes, there is a series of moves that is safe for white.

http://www.youtube.com/watch?v=J9K-PhNVeEk 

I strongly recommend you watch this video on the Berlin Defence. 

Kxg

Thanks. I suppose 3... a6 4. Ba4 doesn't make much influence on the line?