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LINKS
Simon Williams vs Hikaru Nakamura: https://www.youtube.com/watch?annotation_id=annotation_575152931&feature=iv&src_vid=L65bKF6wBZU&v=Du80sON6J4k#t=50m57s
Everything you need to know about castling:
https://www.youtube.com/watch?v=h1LAl_LIP2Y