You are interested in understanding why black's 18th Rc4 merited an !.
I think it will be a little easier to get an answer when you use the Game Editor to post a position and the three miles of variations that were included in the PGN you posted.
Could a strong player help me ?
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I maybe haven't post in the right forum ...It's here >>>
http://www.chess.com/forum/view/chess-players/capablanca---alekhine-18--rc4
Thank you.