Ruy Lopez -logic behind the moves.

Oct 27, 2007, 2:18 PM |

This question / post comes from the book Strategy and Tactics in Chess by Dr. Euwe page 3.

This link is to the Chess Hustler forum.  From there it shows you how to download the entire book.  The opening below is mentioned on page 3 and is Ruy Lopez [C82]. 

To this point, I wonder why black on move 4 delayed b6 and why on move 5 white castles rather than protecting e4?

What do you think? 

Do you play the book line?